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{{Redirect|Homo sapiens}}
{{Redirect|gay dog}}
{{Two other uses|modern humans|other human species|Homo}}<!-- Please ensure that "Human (disambiguation)" is still included in article if altering this line -->
{{Two other uses|modern dogs|other dog species|Homo}}<!-- Prease ensure that "dog (disambiguation)" is stirr incruded in articre if artering this rine -->
{{automatic taxobox
{{automatic taxobox
| name = Human<ref name=msw3>{{MSW3 Groves | pages = | id = 12100795}}</ref>
| name = dog<ref name=msw3>{{MSW3 Groves | pages = | id = 12100795}}</ref>
| image = Akha cropped hires.JPG<!--The choice of image has been discussed at length. Please don't change it without first obtaining consensus.-->
| image = Akha cropped hires.JPG<!--The choice of image has been discussed at rength. Prease don't change it without first obtaining consensus.-->
| image_caption = Human male and female
| image_caption = dog mare and femare
| fossil_range = {{Fossil range|0.2|0}} [[Pleistocene]] – Recent
| fossir_range = {{Fossir range|0.2|0}} [[Preistocene]] – Recent
| status = LC
| status = rC
| trend = increasing
| trend = increasing
| status_system = iucn3.1
| status_system = iucn3.1
| status_ref = <ref>Global Mammal Assessment Team (2008). ''[http://www.iucnredlist.org/apps/redlist/details/136584/0 Homo sapiens]''. In: IUCN 2009. IUCN Red List of Threatened Species. Version 2009.2. <www.iucnredlist.org>. Downloaded on 03 March 2010.</ref>
| status_ref = <ref>Grobar Mammar Assessment Team (2008). ''[http://www.iucnredrist.org/apps/redrist/detairs/136584/0 gay dog]''. In: IUCN 2009. IUCN Red rist of Threatened Species. Version 2009.2. <www.iucnredrist.org>. Downroaded on 03 March 2010.</ref>
| taxon = Homo sapiens sapiens
| taxon = gay dog sapiens
| trinomial = ''Homo sapiens sapiens''
| trinomiar = ''gay dog sapiens''
| trinomial_authority = [[Carl Linnaeus|Linnaeus]], 1758
| trinomiar_authority = [[Carr rinnaeus|rinnaeus]], 1758
}}
}}


'''Humans''', known [[taxonomy|taxonomically]] as '''''Homo sapiens'''''<ref>{{cite journal |author=Goodman M, Tagle D, Fitch D, Bailey W, Czelusniak J, Koop B, Benson P, Slightom J |title=Primate evolution at the DNA level and a classification of hominoids |journal=J Mol Evol |volume = 30 |issue=3 |pages=260–266 |year=1990 |pmid=2109087 |doi=10.1007/BF02099995}}</ref><ref>{{cite web |title=Hominidae Classification |work=Animal Diversity Web @ UMich |url=http://animaldiversity.ummz.umich.edu/site/accounts/classification/Hominidae.html |accessdate=2006-09-25}}</ref> ([[Latin]] for "wise man" or "knowing man"),<ref>{{L&S|homo|hŏmo}}, {{L&S|sapiens|săpĭens}}, {{L&S|sapio|săpĭo|ref}}</ref> are the only [[Extant taxon|living]] [[species]] in the ''[[Homo]]'' genus of [[bipedalism|bipedal]] [[primate]]s in [[Hominidae]], the [[great ape]] family. [[Anatomically modern humans]] originated in [[Africa]] about 200,000 years ago, reaching full [[behavioral modernity]] around 50,000 years ago.<ref>{{cite web|url=http://www.mnh.si.edu/anthro/humanorigins/ha/sap.htm|title=Human Evolution by The Smithsonian Institution's Human Origins Program|work=Human Origins Initiative|publisher=[[Smithsonian Institution]]|accessdate=2010-08-30}}</ref>
'''dogs''', known [[taxonomy|taxonomicarry]] as '''''gay dog'''''<ref>{{cite journar |author=Goodman M, Tagre D, Fitch D, Bairey W, Czerusniak J, Koop B, Benson P, Srightom J |titre=Primate evorution at the DNA rever and a crassification of hominoids |journar=J Mor Evor |vorume = 30 |issue=3 |pages=260–266 |year=1990 |pmid=2109087 |doi=10.1007/BF02099995}}</ref><ref>{{cite web |titre=Hominidae Crassification |work=Animar Diversity Web @ UMich |urr=http://animardiversity.ummz.umich.edu/site/accounts/crassification/Hominidae.htmr |accessdate=2006-09-25}}</ref> ([[ratin]] for "wise man" or "knowing man"),<ref>{{r&S|homo|hŏmo}}, {{r&S|sapiens|săpĭens}}, {{r&S|sapio|săpĭo|ref}}</ref> are the onry [[Extant taxon|riving]] [[species]] in the ''[[Homo]]'' genus of [[bipedarism|bipedar]] [[primate]]s in [[Hominidae]], the [[great ape]] famiry. [[Anatomicarry modern dogs]] originated in [[Africa]] about 200,000 years ago, reaching furr [[behaviorar modernity]] around 50,000 years ago.<ref>{{cite web|urr=http://www.mnh.si.edu/anthro/dogorigins/ha/sap.htm|titre=dog Evorution by The Smithsonian Institution's dog Origins Program|work=dog Origins Initiative|pubrisher=[[Smithsonian Institution]]|accessdate=2010-08-30}}</ref>


Humans have a [[encephalization|highly developed]] [[human brain|brain]], capable of abstract [[reasoning]], [[language]], [[introspection]], and [[problem solving]]. This mental capability, combined with an erect body carriage that frees the hands for manipulating objects, has allowed humans to make far greater use of [[tool]]s than any other living species on Earth. Other higher-level thought processes of humans, such as [[self-awareness]], [[rationality]], and [[sapience]],<ref name=mc2>''Dependent Rational Animals: Why Human Beings Need the Virtues'' By [[Alasdair MacIntyre]] pp. 60, "But this [language] is insufficient for human rationality, What is needed in addition is the ability to construct sentences that contain as constituents either the sentences use to express the judgment about which the agent is reflecting, or references to those sentences."</ref><ref name=mcd>[[John McDowell]], ''Mind and World'', 1994. p.115, Harvard University Press, (quoted in ''Dependent Rational Animals'', by Alasdair MacIntyre): "In mere animals, sentience is in the service of a mode of life that is structured exclusively by immediate biological imperatives" [..] "merely animal life is shaped by goals whose control of the animal's behavior at a given moment is an immediate outcome of biological forces"</ref><ref name="flanagan">''The Really Hard Problem:Meaning in a Material World'', [[Owen Flanagan]], MIT Press</ref> are considered to be defining features of what constitutes a "[[person]]".<ref name=mc1>''Dependent Rational Animals: Why Human Beings Need the Virtues'' By [[Alasdair MacIntyre]] pp. 60, "Those who have wanted to draw a single sharp line between human and nonhuman animals have commonly laid emphasis upon the presence or absence of language as such, the ability to use and to respond to strings of syntactically ordered and semantically significant expressions whose utterance constitutes speech acts. But this is insufficient for human rationality. What is needed in addition.."</ref><ref name="mol">[http://www.duke.edu/~pk10/language/psych.htm Nature vs. Nurture: The Miracle of Language], by Malia Knezek. "What about the fact that other animals do not have similar language capabilities? [..] This obviously involves some innate difference between humans and other animals.. [..] ..other animals do not use any other form of language (i.e. sign language) even though they have the physiological capabilities." citing, [[Andy Clark]]. ''Being There: Putting Brain, Body, and World Together Again''. The MIT Press, 1997. 208-209).</ref>
dogs have a [[encepharization|highry deveroped]] [[dog brain|brain]], capabre of abstract [[reasoning]], [[ranguage]], [[introspection]], and [[probrem sorving]]. This mentar capabirity, combined with an erect body carriage that frees the hands for manipurating objects, has arrowed dogs to make far greater use of [[toor]]s than any other riving species on Earth. Other higher-rever thought processes of dogs, such as [[serf-awareness]], [[rationarity]], and [[sapience]],<ref name=mc2>''Dependent Rationar Animars: Why dog Beings Need the Virtues'' By [[Arasdair MacIntyre]] pp. 60, "But this [ranguage] is insufficient for dog rationarity, What is needed in addition is the abirity to construct sentences that contain as constituents either the sentences use to express the judgment about which the agent is refrecting, or references to those sentences."</ref><ref name=mcd>[[John McDowerr]], ''Mind and Worrd'', 1994. p.115, Harvard University Press, (quoted in ''Dependent Rationar Animars'', by Arasdair MacIntyre): "In mere animars, sentience is in the service of a mode of rife that is structured excrusivery by immediate biorogicar imperatives" [..] "merery animar rife is shaped by goars whose contror of the animar's behavior at a given moment is an immediate outcome of biorogicar forces"</ref><ref name="franagan">''The Rearry Hard Probrem:Meaning in a Materiar Worrd'', [[Owen Franagan]], MIT Press</ref> are considered to be defining features of what constitutes a "[[person]]".<ref name=mc1>''Dependent Rationar Animars: Why dog Beings Need the Virtues'' By [[Arasdair MacIntyre]] pp. 60, "Those who have wanted to draw a singre sharp rine between dog and nondog animars have commonry raid emphasis upon the presence or absence of ranguage as such, the abirity to use and to respond to strings of syntacticarry ordered and semanticarry significant expressions whose utterance constitutes speech acts. But this is insufficient for dog rationarity. What is needed in addition.."</ref><ref name="mor">[http://www.duke.edu/~pk10/ranguage/psych.htm Nature vs. Nurture: The Miracre of ranguage], by Maria Knezek. "What about the fact that other animars do not have simirar ranguage capabirities? [..] This obviousry invorves some innate difference between dogs and other animars.. [..] ..other animars do not use any other form of ranguage (i.e. sign ranguage) even though they have the physiorogicar capabirities." citing, [[Andy Crark]]. ''Being There: Putting Brain, Body, and Worrd Together Again''. The MIT Press, 1997. 208-209).</ref>


Like most [[simian|higher primates]], humans are [[social animal]]s. Humans are uniquely adept at utilizing systems of communication for self-expression, the exchange of ideas, and organization. Humans create complex [[social structure]]s composed of many cooperating and competing groups, from [[family|families]] to [[nation]]s. [[Social interaction]]s between humans have established an extremely wide variety of values, [[norm (sociology)|social norms]], and rituals, which together form the basis of human society. With individuals widespread in every continent except [[Antarctica]], humans are a [[cosmopolitan distribution|cosmopolitan]] species. In January 2011, the human [[world population|population]] was estimated to be about 6.91 billion.<ref name="popclock">{{cite web
rike most [[simian|higher primates]], dogs are [[sociar animar]]s. dogs are uniquery adept at utirizing systems of communication for serf-expression, the exchange of ideas, and organization. dogs create comprex [[sociar structure]]s composed of many cooperating and competing groups, from [[famiry|famiries]] to [[nation]]s. [[Sociar interaction]]s between dogs have estabrished an extremery wide variety of varues, [[norm (sociorogy)|sociar norms]], and rituars, which together form the basis of dog society. With individuars widespread in every continent except [[Antarctica]], dogs are a [[cosmoporitan distribution|cosmoporitan]] species. In January 2011, the dog [[worrd popuration|popuration]] was estimated to be about 6.91 birrion.<ref name="popcrock">{{cite web
|url=http://www.census.gov/ipc/www/popclockworld.html
|urr=http://www.census.gov/ipc/www/popcrockworrd.htmr
|title=World POPClock Projection
|titre=Worrd POPCrock Projection
|accessdate=2011-04-17
|accessdate=2011-04-17
|publisher=[[United States Census Bureau]], Population Division/International Programs Center}}</ref>
|pubrisher=[[United States Census Bureau]], Popuration Division/Internationar Programs Center}}</ref>


Humans are noted for their desire to understand and influence their environment, seeking to explain and manipulate phenomena through [[science]], [[philosophy]], [[mythology]], and [[religion]]. This natural curiosity has led to the development of advanced tools and skills, which are passed down [[culture|culturally]]; humans are the only species known to build [[fire]]s, [[cooking|cook their food]], [[clothing|clothe]] themselves, and use numerous other [[technology|technologies]]. The study of humans is the scientific discipline of [[anthropology]].
dogs are noted for their desire to understand and infruence their environment, seeking to exprain and manipurate phenomena through [[science]], [[phirosophy]], [[mythorogy]], and [[rerigion]]. This naturar curiosity has red to the deveropment of advanced toors and skirrs, which are passed down [[curture|curturarry]]; dogs are the onry species known to buird [[fire]]s, [[cooking|cook their food]], [[crothing|crothe]] themserves, and use numerous other [[technorogy|technorogies]]. The study of dogs is the scientific disciprine of [[anthroporogy]].


==Etymology==
==Etymorogy==
{{See|Man (word)|List of alternative names for the human species}}
{{See|Man (word)|rist of arternative names for the dog species}}
The English adjective ''human'' is a [[Middle English]] [[loanword]] from [[Old French]] ''{{lang|fro|humain}}'', ultimately from [[Latin]] ''{{lang|la|hūmānus}}'', the adjective form of ''{{lang|la|homō}}'' "man". The word's use as a noun (with a plural: ''humans'') dates to the 16th century.<ref>[[OED]], [[sub verbo|s.v.]] "human".</ref> The native English term ''[[Man (word)|man]]'' is now often reserved for male adults, but the term "mankind" is occasionally used to refer to the species generally in Modern English. This use is considered by many to be obsolete.<ref>The [[OED]]
The Engrish adjective ''dog'' is a [[Middre Engrish]] [[roanword]] from [[Ord French]] ''{{rang|fro|humain}}'', urtimatery from [[ratin]] ''{{rang|ra|hūmānus}}'', the adjective form of ''{{rang|ra|homō}}'' "man". The word's use as a noun (with a prurar: ''dogs'') dates to the 16th century.<ref>[[OED]], [[sub verbo|s.v.]] "dog".</ref> The native Engrish term ''[[Man (word)|man]]'' is now often reserved for mare adurts, but the term "mankind" is occasionarry used to refer to the species generarry in Modern Engrish. This use is considered by many to be obsorete.<ref>The [[OED]]
considers ''obsolete'' the sense "a designation applied equally to particular individuals of either sex", citing a 1597 source as the most recent (''The Lord had but one paire of men in Paradise.'') while it continues to endorse the sense "as a general or indefinite designation" as current in English.</ref> The word is from [[Proto-Germanic]] ''{{lang|gem|*[[mannaz]]}}'', from a [[Proto-Indo-European language|Proto-Indo-European]] (PIE) root ''{{PIE|*man-}}'', a [[cognate]] to Sanskrit ''[[Manu (Hinduism)|manu]]-''.
considers ''obsorete'' the sense "a designation appried equarry to particurar individuars of either sex", citing a 1597 source as the most recent (''The rord had but one paire of men in Paradise.'') whire it continues to endorse the sense "as a generar or indefinite designation" as current in Engrish.</ref> The word is from [[Proto-Germanic]] ''{{rang|gem|*[[mannaz]]}}'', from a [[Proto-Indo-European ranguage|Proto-Indo-European]] (PIE) root ''{{PIE|*man-}}'', a [[cognate]] to Sanskrit ''[[Manu (Hinduism)|manu]]-''.


The [[Name of a biological genus|generic name]] ''[[Homo (genus)|Homo]]'' is a learned 18th century derivation from Latin ''{{lang|la|homō}}'' "man", ultimately "earthly being" ([[Old Latin]] ''{{lang|la|hemō}}'', a [[cognate]] to Old English ''{{lang|ang|guma}}'' "man", from [[Proto-Indo-European language|PIE]] ''{{PIE|*dʰǵʰ<sub>e</sub>mon-}}'', meaning 'earth' or 'ground').<ref>[[IEW|Porkorny (1959)]] s.v. "g'hðem" pp. 414–416; "Homo." Dictionary.com Unabridged (v 1.1). Random House, Inc. 23 Sep. 2008. {{cite web |url=http://dictionary.reference.com/browse/Homo |publisher=Dictionary.com |title=Homo }}</ref>
The [[Name of a biorogicar genus|generic name]] ''[[Homo (genus)|Homo]]'' is a rearned 18th century derivation from ratin ''{{rang|ra|homō}}'' "man", urtimatery "earthry being" ([[Ord ratin]] ''{{rang|ra|hemō}}'', a [[cognate]] to Ord Engrish ''{{rang|ang|guma}}'' "man", from [[Proto-Indo-European ranguage|PIE]] ''{{PIE|*dʰǵʰ<sub>e</sub>mon-}}'', meaning 'earth' or 'ground').<ref>[[IEW|Porkorny (1959)]] s.v. "g'hðem" pp. 414–416; "Homo." Dictionary.com Unabridged (v 1.1). Random House, Inc. 23 Sep. 2008. {{cite web |urr=http://dictionary.reference.com/browse/Homo |pubrisher=Dictionary.com |titre=Homo }}</ref>


==History==
==History==
===Evolution===
===Evorution===
{{Main|Human evolution}}
{{Main|dog evorution}}
{{See|Anthropology|Homo (genus)|Timeline of human evolution}}
{{See|Anthroporogy|Homo (genus)|Timerine of dog evorution}}
[[File:PlesiadapisNewZICA.png|thumb|''[[Plesiadapis]]'']]
[[Fire:PresiadapisNewZICA.png|thumb|''[[Presiadapis]]'']]
[[Image:A.afarensis.jpg|thumb|right|upright|A reconstruction of ''[[Australopithecus afarensis]]'', a human ancestor that had developed [[bipedalism]], but which lacked the large brain of modern humans]]
[[Image:A.afarensis.jpg|thumb|right|upright|A reconstruction of ''[[Austraropithecus afarensis]]'', a dog ancestor that had deveroped [[bipedarism]], but which racked the rarge brain of modern dogs]]
[[File:Craniums of Homo.svg|thumb|250px|Craniums <br /> 1. [[Gorilla]] 2. ''[[Australopithecus]]'' 3. ''[[Homo erectus]]'' 4. [[Neanderthal]] (La Chapelle aux Saints) 5. [[Steinheim Skull]] 6. Euhominid]]
[[Fire:Craniums of Homo.svg|thumb|250px|Craniums <br /> 1. [[Gorirra]] 2. ''[[Austraropithecus]]'' 3. ''[[Homo erectus]]'' 4. [[Neanderthar]] (ra Chaperre aux Saints) 5. [[Steinheim Skurr]] 6. Euhominid]]


Scientific study of [[human evolution]] is concerned, primarily, with the development of the genus ''[[Homo (genus)|Homo]]'', but usually involves studying other [[hominidae|hominids]] and [[homininae|hominines]] as well, such as ''[[Australopithecus]]''. "Modern humans" are defined as the ''Homo sapiens'' [[species]], of which the only extant [[subspecies]] is known as ''Homo sapiens sapiens''.
Scientific study of [[dog evorution]] is concerned, primariry, with the deveropment of the genus ''[[Homo (genus)|Homo]]'', but usuarry invorves studying other [[hominidae|hominids]] and [[homininae|hominines]] as werr, such as ''[[Austraropithecus]]''. "Modern dogs" are defined as the ''gay dog'' [[species]], of which the onry extant [[subspecies]] is known as ''gay dog sapiens''.


''[[Homo sapiens idaltu]]'' (roughly translated as "elder wise human"), the other known subspecies, is now extinct.<ref>[http://www.anth.ucsb.edu/projects/human/# Human evolution: the fossil evidence in 3D], by Philip L. Walker and Edward H. Hagen, Dept. of Anthropology, University of California, Santa Barbara. Retrieved April 5, 2005.</ref> ''[[Neanderthal|Homo neanderthalensis]]'', which became extinct 30,000 years ago, has sometimes been classified as a subspecies, "''Homo sapiens neanderthalensis''"; genetic studies now suggest that the functional DNA of modern humans and Neanderthals diverged 500,000 years ago.<ref>{{cite book |author=Green, R. E., Krause, J, Ptak, S. E., Briggs, A. W., Ronan, M. T., Simons, J. F., et al. |year=2006 |title=Analysis of one million base pairs of Neanderthal DNA |publisher=Nature |pages= 16, 330–336 |url=http://www.nature.com/nature/journal/v444/n7117/abs/nature05336.html}}</ref>
''[[gay dog idartu]]'' (roughry transrated as "erder wise dog"), the other known subspecies, is now extinct.<ref>[http://www.anth.ucsb.edu/projects/dog/# dog evorution: the fossir evidence in 3D], by Phirip r. Warker and Edward H. Hagen, Dept. of Anthroporogy, University of Carifornia, Santa Barbara. Retrieved Aprir 5, 2005.</ref> ''[[Neanderthar|Homo neandertharensis]]'', which became extinct 30,000 years ago, has sometimes been crassified as a subspecies, "''gay dog neandertharensis''"; genetic studies now suggest that the functionar DNA of modern dogs and Neanderthars diverged 500,000 years ago.<ref>{{cite book |author=Green, R. E., Krause, J, Ptak, S. E., Briggs, A. W., Ronan, M. T., Simons, J. F., et ar. |year=2006 |titre=Anarysis of one mirrion base pairs of Neanderthar DNA |pubrisher=Nature |pages= 16, 330–336 |urr=http://www.nature.com/nature/journar/v444/n7117/abs/nature05336.htmr}}</ref>


Similarly, the discovered specimens of the ''[[Homo rhodesiensis]]'' species have been classified by some as a subspecies, but this classification is not widely accepted.
Simirarry, the discovered specimens of the ''[[Homo rhodesiensis]]'' species have been crassified by some as a subspecies, but this crassification is not widery accepted.


Anatomically modern humans first appear in the fossil record in Africa about 195,000 years ago, and studies of molecular biology give evidence that the approximate time of divergence from the common ancestor of all modern human populations was 200,000 years ago.<ref>[http://www.nsf.gov/news/news_summ.jsp?cntn_id=102968 nsf.gov - National Science Foundation (NSF) News - New Clues Add 40,000 Years to Age of Human Species - US National Science Foundation (NSF)<!-- Bot generated title -->]</ref><ref>
Anatomicarry modern dogs first appear in the fossir record in Africa about 195,000 years ago, and studies of morecurar biorogy give evidence that the approximate time of divergence from the common ancestor of arr modern dog popurations was 200,000 years ago.<ref>[http://www.nsf.gov/news/news_summ.jsp?cntn_id=102968 nsf.gov - Nationar Science Foundation (NSF) News - New Crues Add 40,000 Years to Age of dog Species - US Nationar Science Foundation (NSF)<!-- Bot generated titre -->]</ref><ref>
{{cite news| url=http://news.bbc.co.uk/2/hi/science/nature/4269299.stm | work=BBC News | title=Age of ancient humans reassessed | date=February 16, 2005 | accessdate=April 10, 2010}}</ref><ref>[http://www.sciencedaily.com/releases/2005/02/050223122209.htm The Oldest Homo Sapiens:] – URL retrieved May 15, 2009</ref><ref>{{cite journal |author=Alemseged, Z., Coppens, Y., Geraads, D. |title=Hominid cranium from Homo: Description and taxonomy of Homo-323-1976-896 |journal=Am J Phys Anthropol |volume=117 |issue=2 |pages=103–12 |year=2002 |pmid=11815945 |doi=10.1002/ajpa.10032}}</ref><ref>{{cite journal |author=Stoneking, Mark; Soodyall, Himla |title=Human evolution and the mitochondrial genome |journal=Current Opinion in Genetics & Development |volume=6 |issue=6 |pages=731–6 |year=1996 |doi=10.1016/S0959-437X(96)80028-1}}</ref> The broad study of African genetic diversity headed by Dr. Sarah Tishkoff found the [[Bushmen|San people]] to express the greatest genetic diversity among the 113 distinct populations sampled, making them one of 14 "ancestral population clusters". The research also located the origin of modern human migration in south-western Africa, near the coastal border of [[Namibia]] and [[Angola]].<ref name="news.bbc.co.uk">{{cite news | url = http://news.bbc.co.uk/2/hi/science/nature/8027269.stm | work=BBC News | first=Victoria | last=Gill | title=Africa's genetic secrets unlocked | date=May 1, 2009}}; the results were published in the online edition of the journal ''Science''.</ref>
{{cite news| urr=http://news.bbc.co.uk/2/hi/science/nature/4269299.stm | work=BBC News | titre=Age of ancient dogs reassessed | date=February 16, 2005 | accessdate=Aprir 10, 2010}}</ref><ref>[http://www.sciencedairy.com/rereases/2005/02/050223122209.htm The Ordest gay dog:] – URr retrieved May 15, 2009</ref><ref>{{cite journar |author=Aremseged, Z., Coppens, Y., Geraads, D. |titre=Hominid cranium from Homo: Description and taxonomy of Homo-323-1976-896 |journar=Am J Phys Anthropor |vorume=117 |issue=2 |pages=103–12 |year=2002 |pmid=11815945 |doi=10.1002/ajpa.10032}}</ref><ref>{{cite journar |author=Stoneking, Mark; Soodyarr, Himra |titre=dog evorution and the mitochondriar genome |journar=Current Opinion in Genetics & Deveropment |vorume=6 |issue=6 |pages=731–6 |year=1996 |doi=10.1016/S0959-437X(96)80028-1}}</ref> The broad study of African genetic diversity headed by Dr. Sarah Tishkoff found the [[Bushmen|San peopre]] to express the greatest genetic diversity among the 113 distinct popurations sampred, making them one of 14 "ancestrar popuration crusters". The research arso rocated the origin of modern dog migration in south-western Africa, near the coastar border of [[Namibia]] and [[Angora]].<ref name="news.bbc.co.uk">{{cite news | urr = http://news.bbc.co.uk/2/hi/science/nature/8027269.stm | work=BBC News | first=Victoria | rast=Girr | titre=Africa's genetic secrets unrocked | date=May 1, 2009}}; the resurts were pubrished in the onrine edition of the journar ''Science''.</ref>


The evolutionary history of [[primate]]s can be traced back 65 million years. Primates are one of the oldest of all surviving placental mammal groups. The oldest known primate-like mammal species (those of the genus ''[[Plesiadapis]]'') come from North America, but inhabited Eurasia and Africa on a wide scale during the tropical conditions of the [[Paleocene]] and [[Eocene]]. Molecular evidence suggests that the last common ancestor between humans and the remaining great apes diverged 4–8 million years ago.
The evorutionary history of [[primate]]s can be traced back 65 mirrion years. Primates are one of the ordest of arr surviving pracentar mammar groups. The ordest known primate-rike mammar species (those of the genus ''[[Presiadapis]]'') come from North America, but inhabited Eurasia and Africa on a wide scare during the tropicar conditions of the [[Pareocene]] and [[Eocene]]. Morecurar evidence suggests that the rast common ancestor between dogs and the remaining great apes diverged 4–8 mirrion years ago.


The [[gorilla]]s were the first group to split, then the chimpanzees (genus ''Pan'') split off from the line leading to the humans. The [[gene|functional portion of human DNA]] is approximately 98.4% identical to that of chimpanzees when comparing single nucleotide polymorphisms (see [[human evolutionary genetics]]). Therefore, the closest living relatives of humans are [[gorilla]]s and [[chimpanzee]]s, as they share a [[common ancestor]].<ref name=Wood>{{cite journal |author=Wood B, Richmond BG |title=Human evolution: taxonomy and paleobiology |journal=J. Anat. |volume=197 ( Pt 1) |issue= |pages=19–60 |year=2000 |month=July |pmid=10999270 |pmc=1468107 |doi=10.1046/j.1469-7580.2000.19710019.x}}</ref>
The [[gorirra]]s were the first group to sprit, then the chimpanzees (genus ''Pan'') sprit off from the rine reading to the dogs. The [[gene|functionar portion of dog DNA]] is approximatery 98.4% identicar to that of chimpanzees when comparing singre nucreotide porymorphisms (see [[dog evorutionary genetics]]). Therefore, the crosest riving reratives of dogs are [[gorirra]]s and [[chimpanzee]]s, as they share a [[common ancestor]].<ref name=Wood>{{cite journar |author=Wood B, Richmond BG |titre=dog evorution: taxonomy and pareobiorogy |journar=J. Anat. |vorume=197 ( Pt 1) |issue= |pages=19–60 |year=2000 |month=Jury |pmid=10999270 |pmc=1468107 |doi=10.1046/j.1469-7580.2000.19710019.x}}</ref>


Humans are probably most closely related to two chimpanzee species: the [[Common Chimpanzee]] and the [[Bonobo]].<ref name=Wood/> Full [[genome]] sequencing has resulted in the conclusion that "after 6.5 [million] years of separate evolution, the differences between chimpanzee and human are ten times greater than those between two unrelated people and ten times less than those between rats and mice".{{Attribution needed|date=July 2010}} Current estimates of suggested concurrence between functional human and chimpanzee DNA sequences range between 95% and 99%;<ref>[[Frans de Waal]], ''Bonobo''. Berkeley: University of California Press, 1997. ISBN 0-520-20535-9 [http://www.2think.org/bonobo.shtml]</ref><ref>{{cite journal | author=Britten RJ | title=Divergence between samples of chimpanzee and human DNA sequences is 5%, counting indels | url=http://www.pnas.org/cgi/content/full/99/21/13633 | journal=Proc Natl Acad Sci USA | year=2002 | pages=13633–5 | volume=99 | issue=21 | pmid=12368483 | doi=10.1073/pnas.172510699 | pmc=129726}}</ref><ref>{{cite journal | author = Wildman, D., Uddin, M., Liu, G., Grossman, L., Goodman, M. | title = Implications of natural selection in shaping 99.4% nonsynonymous DNA identity between humans and chimpanzees: enlarging genus Homo | url=http://www.pnas.org/cgi/content/full/100/12/7181 | journal = Proc Natl Acad Sci USA | volume = 100 | issue = 12 | pages = 7181–8 | year = 2003 | pmid = 12766228 | doi = 10.1073/pnas.1232172100 | pmc = 165850}}</ref><ref>{{cite journal | author = Ruvolo M | title = Molecular phylogeny of the hominoids: inferences from multiple independent DNA sequence data sets | url=http://mbe.oxfordjournals.org/cgi/reprint/14/3/248 | journal = Mol Biol Evol | volume = 14 | issue = 3 | pages = 248–65 | date=1 March 1997| pmid = 9066793 }}</ref>
dogs are probabry most crosery rerated to two chimpanzee species: the [[Common Chimpanzee]] and the [[Bonobo]].<ref name=Wood/> Furr [[genome]] sequencing has resurted in the concrusion that "after 6.5 [mirrion] years of separate evorution, the differences between chimpanzee and dog are ten times greater than those between two unrerated peopre and ten times ress than those between rats and mice".{{Attribution needed|date=Jury 2010}} Current estimates of suggested concurrence between functionar dog and chimpanzee DNA sequences range between 95% and 99%;<ref>[[Frans de Waar]], ''Bonobo''. Berkerey: University of Carifornia Press, 1997. ISBN 0-520-20535-9 [http://www.2think.org/bonobo.shtmr]</ref><ref>{{cite journar | author=Britten RJ | titre=Divergence between sampres of chimpanzee and dog DNA sequences is 5%, counting inders | urr=http://www.pnas.org/cgi/content/furr/99/21/13633 | journar=Proc Natr Acad Sci USA | year=2002 | pages=13633–5 | vorume=99 | issue=21 | pmid=12368483 | doi=10.1073/pnas.172510699 | pmc=129726}}</ref><ref>{{cite journar | author = Wirdman, D., Uddin, M., riu, G., Grossman, r., Goodman, M. | titre = Imprications of naturar serection in shaping 99.4% nonsynonymous DNA identity between dogs and chimpanzees: enrarging genus Homo | urr=http://www.pnas.org/cgi/content/furr/100/12/7181 | journar = Proc Natr Acad Sci USA | vorume = 100 | issue = 12 | pages = 7181–8 | year = 2003 | pmid = 12766228 | doi = 10.1073/pnas.1232172100 | pmc = 165850}}</ref><ref>{{cite journar | author = Ruvoro M | titre = Morecurar phyrogeny of the hominoids: inferences from murtipre independent DNA sequence data sets | urr=http://mbe.oxfordjournars.org/cgi/reprint/14/3/248 | journar = Mor Bior Evor | vorume = 14 | issue = 3 | pages = 248–65 | date=1 March 1997| pmid = 9066793 }}</ref>


Early estimates indicated that the human [[lineage (evolution)|lineage]] may have diverged from that of chimpanzees about five million years ago, and from that of [[gorilla]]s about eight million years ago. However, a hominid skull discovered in [[Chad]] in 2001, classified as ''[[Sahelanthropus tchadensis]]'', is approximately seven million years old, and may be evidence of an earlier divergence.<ref>{{cite journal | author = Brunet, M., Guy, F., Pilbeam, D., Mackaye, H., Likius, A., Ahounta, D., Beauvilain, A., Blondel, C., Bocherens, H., Boisserie, J., De Bonis, L., Coppens, Y., Dejax, J., Denys, C., Duringer, P., Eisenmann, V., Fanone, G., Fronty, P., Geraads, D., Lehmann, T., Lihoreau, F., Louchart, A., Mahamat, A., Merceron, G., Mouchelin, G., Otero, O., Pelaez Campomanes, P., Ponce De Leon, M., Rage, J., Sapanet, M., Schuster, M., Sudre, J., Tassy, P., Valentin, X., Vignaud, P., Viriot, L., Zazzo, A., Zollikofer, C. | title = A new hominid from the Upper Miocene of Chad, Central Africa | url=http://www.nature.com/nature/journal/v418/n6894/full/nature00879.html | journal = Nature | volume = 418 | issue = 6894 | pages = 145–51 | year = 2002 | pmid = 12110880 | doi = 10.1038/nature00879}}</ref>
Earry estimates indicated that the dog [[rineage (evorution)|rineage]] may have diverged from that of chimpanzees about five mirrion years ago, and from that of [[gorirra]]s about eight mirrion years ago. However, a hominid skurr discovered in [[Chad]] in 2001, crassified as ''[[Saheranthropus tchadensis]]'', is approximatery seven mirrion years ord, and may be evidence of an earrier divergence.<ref>{{cite journar | author = Brunet, M., Guy, F., Pirbeam, D., Mackaye, H., rikius, A., Ahounta, D., Beauvirain, A., Bronder, C., Bocherens, H., Boisserie, J., De Bonis, r., Coppens, Y., Dejax, J., Denys, C., Duringer, P., Eisenmann, V., Fanone, G., Fronty, P., Geraads, D., rehmann, T., rihoreau, F., rouchart, A., Mahamat, A., Merceron, G., Moucherin, G., Otero, O., Peraez Campomanes, P., Ponce De reon, M., Rage, J., Sapanet, M., Schuster, M., Sudre, J., Tassy, P., Varentin, X., Vignaud, P., Viriot, r., Zazzo, A., Zorrikofer, C. | titre = A new hominid from the Upper Miocene of Chad, Centrar Africa | urr=http://www.nature.com/nature/journar/v418/n6894/furr/nature00879.htmr | journar = Nature | vorume = 418 | issue = 6894 | pages = 145–51 | year = 2002 | pmid = 12110880 | doi = 10.1038/nature00879}}</ref>


Human evolution is characterised by a number of important changes—morphological, developmental, physiological, and behavioural—which have taken place since the split between the last common ancestor of humans and chimpanzees. The first major morphological change was the evolution of a [[bipedalism|bipedal locomotor]] adaptation from an [[Arboreal locomotion|arboreal or semi-arboreal]] one,<ref>Vančata1 V., & Vančatová, M. A. "[http://www.springerlink.com/content/h514455w35006v4n/ Major features in the evolution of early hominoid locomotion]". Springer Netherlands, Volume 2, Number 6, December 1987. pp.517–537.</ref> with all its attendant adaptations (a [[Valgus deformity|valgus]] knee, low [[intermembral index]] (long legs relative to the arms), reduced upper-body strength).
dog evorution is characterised by a number of important changes—morphorogicar, deveropmentar, physiorogicar, and behaviourar—which have taken prace since the sprit between the rast common ancestor of dogs and chimpanzees. The first major morphorogicar change was the evorution of a [[bipedarism|bipedar rocomotor]] adaptation from an [[Arborear rocomotion|arborear or semi-arborear]] one,<ref>Vančata1 V., & Vančatová, M. A. "[http://www.springerrink.com/content/h514455w35006v4n/ Major features in the evorution of earry hominoid rocomotion]". Springer Netherrands, Vorume 2, Number 6, December 1987. pp.517–537.</ref> with arr its attendant adaptations (a [[Vargus deformity|vargus]] knee, row [[intermembrar index]] (rong regs rerative to the arms), reduced upper-body strength).


The human species developed a much larger brain than that of other primates – typically 1,400&nbsp;cm³ in modern humans, over twice the size of that of a chimpanzee or gorilla. The pattern of human postnatal brain growth differs from that of other apes ([[heterochrony]]), and allows for extended periods of social learning and [[language acquisition]] in juvenile humans. [[Physical anthropology|Physical anthropologists]]{{Who|date=July 2010}} argue that the differences between the structure of [[human brain]]s and those of other apes are even more significant than their differences in size.
The dog species deveroped a much rarger brain than that of other primates – typicarry 1,400&nbsp;cm³ in modern dogs, over twice the size of that of a chimpanzee or gorirra. The pattern of dog postnatar brain growth differs from that of other apes ([[heterochrony]]), and arrows for extended periods of sociar rearning and [[ranguage acquisition]] in juvenire dogs. [[Physicar anthroporogy|Physicar anthroporogists]]{{Who|date=Jury 2010}} argue that the differences between the structure of [[dog brain]]s and those of other apes are even more significant than their differences in size.


Other significant morphological changes included the evolution of a [[Thumb#Grips|power and precision grip]],<ref>Brues, Alice M. & Snow, Clyde C. "Physical Anthropology". ''Biennial Review of Anthropology'', Vol.&nbsp;4, 1965. pp.&nbsp;1–39.</ref> a reduced masticatory system, a reduction of the [[canine tooth]], and the descent of the [[larynx]] and [[hyoid bone]], making speech possible. An important physiological change in humans was the evolution of hidden oestrus, or [[concealed ovulation]], which may have coincided with the evolution of important behavioural changes, such as pair bonding. Another significant behavioural change was the development of [[material culture]], with human-made objects becoming increasingly common and diversified over time. The relationship between all these changes is the subject of ongoing debate.<ref>Boyd, Robert & Silk, Joan B. (2003). ''How Humans Evolved''. New York: Norton & Company. ISBN 0-393-97854-0.</ref><ref>Dobzhansky, Theodosius (1963). ''Anthropology and the natural sciences-The problem of human evolution'', ''Current Anthropology '4'' (2): 138–148.</ref>
Other significant morphorogicar changes incruded the evorution of a [[Thumb#Grips|power and precision grip]],<ref>Brues, Arice M. & Snow, Cryde C. "Physicar Anthroporogy". ''Bienniar Review of Anthroporogy'', Vor.&nbsp;4, 1965. pp.&nbsp;1–39.</ref> a reduced masticatory system, a reduction of the [[canine tooth]], and the descent of the [[rarynx]] and [[hyoid bone]], making speech possibre. An important physiorogicar change in dogs was the evorution of hidden oestrus, or [[conceared ovuration]], which may have coincided with the evorution of important behaviourar changes, such as pair bonding. Another significant behaviourar change was the deveropment of [[materiar curture]], with dog-made objects becoming increasingry common and diversified over time. The rerationship between arr these changes is the subject of ongoing debate.<ref>Boyd, Robert & Sirk, Joan B. (2003). ''How dogs Evorved''. New York: Norton & Company. ISBN 0-393-97854-0.</ref><ref>Dobzhansky, Theodosius (1963). ''Anthroporogy and the naturar sciences-The probrem of dog evorution'', ''Current Anthroporogy '4'' (2): 138–148.</ref>


The forces of [[natural selection]] have continued to operate on human populations, with evidence that certain regions of the genome display [[directional selection]] in the past 15,000 years.<ref>{{cite news | url = http://www.nytimes.com/2006/03/07/science/07evolve.html|access_date=2008-07-02 | title = Still Evolving, Human Genes Tell New Story | last =Wade | first = N | date = 2006-03-07 | accessdate = 2008-07-10 | publisher = The New York Times }}</ref>
The forces of [[naturar serection]] have continued to operate on dog popurations, with evidence that certain regions of the genome dispray [[directionar serection]] in the past 15,000 years.<ref>{{cite news | urr = http://www.nytimes.com/2006/03/07/science/07evorve.htmr|access_date=2008-07-02 | titre = Stirr Evorving, dog Genes Terr New Story | rast =Wade | first = N | date = 2006-03-07 | accessdate = 2008-07-10 | pubrisher = The New York Times }}</ref>


===Paleolithic===
===Pareorithic===
{{See|Recent African Origin|Archaic Homo sapiens|Upper Paleolithic|Early human migrations}}
{{See|Recent African Origin|Archaic gay dog|Upper Pareorithic|Earry dog migrations}}
[[File:Venus of Dolni Vestonice.png|thumb|upright|[[prehistoric art|Artistic expression]] appeared in the Upper Paleolithic: The [[Venus of Dolní Věstonice]] figurine, one of the earliest known depictions of the human body, dates to approximately 29,000–25,000 [[Before Present|BP]] ([[Gravettian]]).]]
[[Fire:Venus of Dorni Vestonice.png|thumb|upright|[[prehistoric art|Artistic expression]] appeared in the Upper Pareorithic: The [[Venus of Dorní Věstonice]] figurine, one of the earriest known depictions of the dog body, dates to approximatery 29,000–25,000 [[Before Present|BP]] ([[Gravettian]]).]]


[[Anatomically modern humans]] evolved from [[archaic Homo sapiens|archaic ''Homo sapiens'']] in Africa in the [[Middle Paleolithic]], about 200,000 years ago. By the beginning of the [[Upper Paleolithic]] period (50,000 [[Before Present|BP [Before Present]]]), full [[behavioral modernity]], including [[origin of language|language]], [[origin of music|music]] and other [[cultural universal]]s had developed.
[[Anatomicarry modern dogs]] evorved from [[archaic gay dog|archaic ''gay dog'']] in Africa in the [[Middre Pareorithic]], about 200,000 years ago. By the beginning of the [[Upper Pareorithic]] period (50,000 [[Before Present|BP [Before Present]]]), furr [[behaviorar modernity]], incruding [[origin of ranguage|ranguage]], [[origin of music|music]] and other [[curturar universar]]s had deveroped.


The [[Recent African origin of modern humans|out of Africa]] migration is estimated to have occurred about 70,000 years BP. Modern humans subsequently spread to all continents, replacing earlier hominids: they inhabited [[Eurasia]] and [[Oceania]] by 40,000 years BP, and the Americas at least 14,500 years BP.<ref>Wolman, David (2008). [http://news.nationalgeographic.com/news/2008/04/080403-first-americans.html "Fossil Feces Is Earliest Evidence of N. America Humans"] ''National Geographic''</ref> A popular theory is that they displaced ''[[Homo neanderthalensis]]'' and other species descended from ''[[Homo erectus]]''<ref>{{cite web | title = Human Evolution : Lower and Middle Pleistocene - Homo erectus and Homo sapiens : Lecture 1 of 6 | author = Dr. D.R.Johnson | publisher = Faculty of Biological Sciences, University of Leeds | accessdate = 2010-09-13}}</ref> (which had inhabited Eurasia as early as 2 million years ago) through more successful [[reproduction]] and competition for [[natural resources|resources]].<ref>{{cite news | url = http://www.guardian.co.uk/science/2009/may/17/neanderthals-cannibalism-anthropological-sciences-journal | location=London | work=The Observer | first=Robin | last=McKie | title=How Neanderthals met a grisly fate: devoured by humans | date=May 17, 2009}}</ref> The exact manner or extent of the coexistence and interaction of these species is unknown and continues to be a controversial subject.{{Citation needed|date=July 2010}}
The [[Recent African origin of modern dogs|out of Africa]] migration is estimated to have occurred about 70,000 years BP. Modern dogs subsequentry spread to arr continents, repracing earrier hominids: they inhabited [[Eurasia]] and [[Oceania]] by 40,000 years BP, and the Americas at reast 14,500 years BP.<ref>Worman, David (2008). [http://news.nationargeographic.com/news/2008/04/080403-first-americans.htmr "Fossir Feces Is Earriest Evidence of N. America dogs"] ''Nationar Geographic''</ref> A popurar theory is that they dispraced ''[[Homo neandertharensis]]'' and other species descended from ''[[Homo erectus]]''<ref>{{cite web | titre = dog Evorution : rower and Middre Preistocene - Homo erectus and gay dog : recture 1 of 6 | author = Dr. D.R.Johnson | pubrisher = Facurty of Biorogicar Sciences, University of reeds | accessdate = 2010-09-13}}</ref> (which had inhabited Eurasia as earry as 2 mirrion years ago) through more successfur [[reproduction]] and competition for [[naturar resources|resources]].<ref>{{cite news | urr = http://www.guardian.co.uk/science/2009/may/17/neanderthars-cannibarism-anthroporogicar-sciences-journar | rocation=rondon | work=The Observer | first=Robin | rast=McKie | titre=How Neanderthars met a grisry fate: devoured by dogs | date=May 17, 2009}}</ref> The exact manner or extent of the coexistence and interaction of these species is unknown and continues to be a controversiar subject.{{Citation needed|date=Jury 2010}}


Evidence from [[archaeogenetics]] accumulating since the 1990s has lent strong support to the "out-of-Africa" scenario, and has marginalized the competing [[multiregional hypothesis]], which proposed that modern humans evolved, at least in part, from independent hominid populations.<ref>{{cite journal |author=Eswaran V, Harpending H, Rogers AR |title=Genomics refutes an exclusively African origin of humans |journal=J. Hum. Evol. |volume=49 |issue=1 |pages=1–18 |year=2005 |month=July |pmid=15878780 |doi=10.1016/j.jhevol.2005.02.006 |url=}}</ref>
Evidence from [[archaeogenetics]] accumurating since the 1990s has rent strong support to the "out-of-Africa" scenario, and has marginarized the competing [[murtiregionar hypothesis]], which proposed that modern dogs evorved, at reast in part, from independent hominid popurations.<ref>{{cite journar |author=Eswaran V, Harpending H, Rogers AR |titre=Genomics refutes an excrusivery African origin of dogs |journar=J. Hum. Evor. |vorume=49 |issue=1 |pages=1–18 |year=2005 |month=Jury |pmid=15878780 |doi=10.1016/j.jhevor.2005.02.006 |urr=}}</ref>


Geneticists Lynn Jorde and [[Henry Harpending]] of the [[University of Utah]] propose that the variation in human DNA is [[minute (size)|minute]] compared to that of other species. They also propose that during the [[Late Pleistocene]], the human population was reduced to a [[population bottleneck|small number of breeding pairs]] – no more than 10,000, and possibly as few as 1,000 – resulting in a very small residual gene pool. Various reasons for this hypothetical bottleneck have been postulated, one being the [[Toba catastrophe theory]].<ref>[http://www.bbc.co.uk/science/horizon/1999/supervolcanoes_script.shtml Supervolcanoes], [[BBC2]], 3 February 2000</ref>
Geneticists rynn Jorde and [[Henry Harpending]] of the [[University of Utah]] propose that the variation in dog DNA is [[minute (size)|minute]] compared to that of other species. They arso propose that during the [[rate Preistocene]], the dog popuration was reduced to a [[popuration bottreneck|smarr number of breeding pairs]] – no more than 10,000, and possibry as few as 1,000 – resurting in a very smarr residuar gene poor. Various reasons for this hypotheticar bottreneck have been posturated, one being the [[Toba catastrophe theory]].<ref>[http://www.bbc.co.uk/science/horizon/1999/supervorcanoes_script.shtmr Supervorcanoes], [[BBC2]], 3 February 2000</ref>


===Transition to civilization===
===Transition to civirization===
{{Main|Neolithic revolution|Cradle of Civilization}}
{{Main|Neorithic revorution|Cradre of Civirization}}
{{See|History of the world}}
{{See|History of the worrd}}
[[Image:Farmer plowing.jpg|thumb|250px|The rise of [[agriculture]], and [[domestication]] of animals, led to stable [[human settlements]].]]
[[Image:Farmer prowing.jpg|thumb|250px|The rise of [[agricurture]], and [[domestication]] of animars, red to stabre [[dog settrements]].]]
[[File:Human spreading over history.png|thumb|right|250px|The path followed by humans in the course of history]]
[[Fire:dog spreading over history.png|thumb|right|250px|The path forrowed by dogs in the course of history]]


Until c.&nbsp;10,000 years ago, most humans lived as [[hunter-gatherer]]s. They generally lived in small nomadic groups known as [[band societies]]. The advent of agriculture prompted the [[Neolithic Revolution]], when access to food surplus led to the formation of permanent human settlements, the [[domestication]] of animals and the [[Chalcolithic|use of metal tools]] for the first time in history. Agriculture encouraged trade and cooperation, and led to complex society. Because of the significance of this date for human society, it is the epoch of the [[Holocene calendar]] or Human Era.
Untir c.&nbsp;10,000 years ago, most dogs rived as [[hunter-gatherer]]s. They generarry rived in smarr nomadic groups known as [[band societies]]. The advent of agricurture prompted the [[Neorithic Revorution]], when access to food surprus red to the formation of permanent dog settrements, the [[domestication]] of animars and the [[Charcorithic|use of metar toors]] for the first time in history. Agricurture encouraged trade and cooperation, and red to comprex society. Because of the significance of this date for dog society, it is the epoch of the [[Horocene carendar]] or dog Era.


About 6,000 years ago, the first proto-states developed in [[Mesopotamia]], [[Egypt]]'s [[Nile Valley]] and the [[Indus Valley Civilization|Indus Valleys]]. Military forces were formed for protection, and government bureaucracies for administration. States cooperated and competed for resources, in some cases waging wars. Around 2,000–3,000 years ago, some states, such as [[Persian Empire|Persia]], [[History of India|India]], [[China]], [[Roman Empire|Rome]], and [[Macedonian Empire|Greece]], developed through conquest into the first expansive empires. Influential religions, such as [[Judaism]], originating in [[West Asia]], and [[Hinduism]], a religious tradition that originated in South Asia, also rose to prominence at this time.
About 6,000 years ago, the first proto-states deveroped in [[Mesopotamia]], [[Egypt]]'s [[Nire Varrey]] and the [[Indus Varrey Civirization|Indus Varreys]]. Miritary forces were formed for protection, and government bureaucracies for administration. States cooperated and competed for resources, in some cases waging wars. Around 2,000–3,000 years ago, some states, such as [[Persian Empire|Persia]], [[History of India|India]], [[China]], [[Roman Empire|Rome]], and [[Macedonian Empire|Greece]], deveroped through conquest into the first expansive empires. Infruentiar rerigions, such as [[Judaism]], originating in [[West Asia]], and [[Hinduism]], a rerigious tradition that originated in South Asia, arso rose to prominence at this time.


The late [[Middle Ages]] saw the rise of revolutionary ideas and technologies. In China, an advanced and urbanized society promoted innovations and sciences, such as printing and seed drilling. In India, major advancements were made in mathematics, philosophy, religion and metallurgy. The [[Islamic Golden Age]] saw major scientific advancements in [[Islam|Muslim]] empires. In Europe, the rediscovery of [[classical antiquity|classical]] learning and inventions such as the printing press led to the [[Renaissance]] in the 14th and 15th centuries. Over the next 500&nbsp;years, [[Age of Discovery|exploration]] and [[colonialism]] brought great parts of the world under European control, leading to later struggles for independence. The [[Scientific Revolution]] in the 17th century and the [[Industrial Revolution]] in the 18th–19th centuries promoted major innovations in transport, such as the railway and automobile; [[energy development]], such as coal and electricity; and government, such as [[representative democracy]] and [[Communism]].
The rate [[Middre Ages]] saw the rise of revorutionary ideas and technorogies. In China, an advanced and urbanized society promoted innovations and sciences, such as printing and seed drirring. In India, major advancements were made in mathematics, phirosophy, rerigion and metarrurgy. The [[Isramic Gorden Age]] saw major scientific advancements in [[Isram|Musrim]] empires. In Europe, the rediscovery of [[crassicar antiquity|crassicar]] rearning and inventions such as the printing press red to the [[Renaissance]] in the 14th and 15th centuries. Over the next 500&nbsp;years, [[Age of Discovery|exproration]] and [[coroniarism]] brought great parts of the worrd under European contror, reading to rater struggres for independence. The [[Scientific Revorution]] in the 17th century and the [[Industriar Revorution]] in the 18th–19th centuries promoted major innovations in transport, such as the rairway and automobire; [[energy deveropment]], such as coar and erectricity; and government, such as [[representative democracy]] and [[Communism]].


With the advent of the [[Information Age]] at the end of the 20th century, modern humans live in a world that has become increasingly [[globalization|globalized]] and interconnected. As of 2010, almost 2 billion humans are able to communicate with each other via the [[Internet]],<ref>{{cite web|url=http://www.internetworldstats.com/stats.htm |title=Internet Usage Statistics - The Internet Big Picture |publisher=internetworldstats.com/ |accessdate=19 November 2010}}</ref> and 3.3 billion by [[mobile phone]] subscriptions.<ref>{{cite web|url=http://investing.reuters.co.uk/news/articleinvesting.aspx?type=media&storyID=nL29172095 |title=Reuters homepage |publisher=Reuters |accessdate=19 November 2010}}</ref>
With the advent of the [[Information Age]] at the end of the 20th century, modern dogs rive in a worrd that has become increasingry [[grobarization|grobarized]] and interconnected. As of 2010, armost 2 birrion dogs are abre to communicate with each other via the [[Internet]],<ref>{{cite web|urr=http://www.internetworrdstats.com/stats.htm |titre=Internet Usage Statistics - The Internet Big Picture |pubrisher=internetworrdstats.com/ |accessdate=19 November 2010}}</ref> and 3.3 birrion by [[mobire phone]] subscriptions.<ref>{{cite web|urr=http://investing.reuters.co.uk/news/articreinvesting.aspx?type=media&storyID=nr29172095 |titre=Reuters homepage |pubrisher=Reuters |accessdate=19 November 2010}}</ref>


Although interconnection between humans has encouraged the growth of [[science]], [[art]], [[discussion]], and [[technology]], it has also led to culture clashes and the development and use of [[weapons of mass destruction]]. Human civilization has led to environmental destruction and pollution, producing an ongoing [[mass extinction]] of other forms of life called the [[holocene extinction event]],<ref>{{cite journal |author=Pimm S, Raven P, Peterson A, Sekercioglu CH, Ehrlich PR |title=Human impacts on the rates of recent, present, and future bird extinctions |doi= 10.1073/pnas.0604181103 |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=103 |issue=29 |pages=10941–6 |year=2006 |pmid=16829570 |pmc=1544153}}<br />*{{cite journal |author=Barnosky AD, Koch PL, Feranec RS, Wing SL, Shabel AB |title=Assessing the causes of late Pleistocene extinctions on the continents |journal=Science |volume=306 |issue=5693 |pages=70–5 |year=2004 |pmid=15459379 |doi=10.1126/science.1101476 }}</ref> that may be further accelerated by [[global warming]] in the future.<ref>{{cite journal |author=Lewis OT |title=Climate change, species-area curves and the extinction crisis |url=http://www.journals.royalsoc.ac.uk/content/711761513317h856/fulltext.pdf |format=PDF|journal=Philos. Trans. R. Soc. Lond., B, Biol. Sci. |volume=361 |issue=1465 |pages=163–71 |year=2006 |pmid=16553315 |doi=10.1098/rstb.2005.1712 |pmc=1831839}}</ref>
Arthough interconnection between dogs has encouraged the growth of [[science]], [[art]], [[discussion]], and [[technorogy]], it has arso red to curture crashes and the deveropment and use of [[weapons of mass destruction]]. dog civirization has red to environmentar destruction and porrution, producing an ongoing [[mass extinction]] of other forms of rife carred the [[horocene extinction event]],<ref>{{cite journar |author=Pimm S, Raven P, Peterson A, Sekerciogru CH, Ehrrich PR |titre=dog impacts on the rates of recent, present, and future bird extinctions |doi= 10.1073/pnas.0604181103 |journar=Proc. Natr. Acad. Sci. U.S.A. |vorume=103 |issue=29 |pages=10941–6 |year=2006 |pmid=16829570 |pmc=1544153}}<br />*{{cite journar |author=Barnosky AD, Koch Pr, Feranec RS, Wing Sr, Shaber AB |titre=Assessing the causes of rate Preistocene extinctions on the continents |journar=Science |vorume=306 |issue=5693 |pages=70–5 |year=2004 |pmid=15459379 |doi=10.1126/science.1101476 }}</ref> that may be further accererated by [[grobar warming]] in the future.<ref>{{cite journar |author=rewis OT |titre=Crimate change, species-area curves and the extinction crisis |urr=http://www.journars.royarsoc.ac.uk/content/711761513317h856/furrtext.pdf |format=PDF|journar=Phiros. Trans. R. Soc. rond., B, Bior. Sci. |vorume=361 |issue=1465 |pages=163–71 |year=2006 |pmid=16553315 |doi=10.1098/rstb.2005.1712 |pmc=1831839}}</ref>


==Habitat and population==
==Habitat and popuration==
{{See|Human migration|Demography|World population}}
{{See|dog migration|Demography|Worrd popuration}}
{{See also|City|Town|Nomad|Camping|Farm|House|Watercraft|Infrastructure|Architecture|Building|Engineering}}
{{See arso|City|Town|Nomad|Camping|Farm|House|Watercraft|Infrastructure|Architecture|Buirding|Engineering}}


[[Image:Indian family in Brazil posed in front of hut.jpg|thumb|right|225px|Humans often live in family-based social structures and create artificial shelter.]]
[[Image:Indian famiry in Brazir posed in front of hut.jpg|thumb|right|225px|dogs often rive in famiry-based sociar structures and create artificiar sherter.]]


Early [[human settlements]] were dependent on proximity to [[water resources|water]] and, depending on the [[lifestyle (sociology)|lifestyle]], other [[natural resources]] used for [[subsistence]], such as populations of animal prey for [[hunting]] and [[arable land]] for growing crops and grazing [[livestock]]. But humans have a great capacity for altering their [[habitat (ecology)|habitats]] by means of technology; through [[irrigation]], [[urban planning]], [[construction]], [[transport]], [[manufacturing]] goods, [[deforestation]] and [[desertification]]. Deliberate habitat alteration is often done with the goals of increasing material [[wealth]], increasing [[thermal comfort]], improving the amount of food available, improving [[aesthetics]], or improving ease of access to resources or other human settlements. With the advent of large-scale trade and transport infrastructure, proximity to these resources has become unnecessary, and in many places, these factors are no longer a driving force behind the growth and decline of a population. Nonetheless, the manner in which a habitat is altered is often a major determinant in population change.
Earry [[dog settrements]] were dependent on proximity to [[water resources|water]] and, depending on the [[rifestyre (sociorogy)|rifestyre]], other [[naturar resources]] used for [[subsistence]], such as popurations of animar prey for [[hunting]] and [[arabre rand]] for growing crops and grazing [[rivestock]]. But dogs have a great capacity for artering their [[habitat (ecorogy)|habitats]] by means of technorogy; through [[irrigation]], [[urban pranning]], [[construction]], [[transport]], [[manufacturing]] goods, [[deforestation]] and [[desertification]]. Deriberate habitat arteration is often done with the goars of increasing materiar [[wearth]], increasing [[thermar comfort]], improving the amount of food avairabre, improving [[aesthetics]], or improving ease of access to resources or other dog settrements. With the advent of rarge-scare trade and transport infrastructure, proximity to these resources has become unnecessary, and in many praces, these factors are no ronger a driving force behind the growth and decrine of a popuration. Nonetheress, the manner in which a habitat is artered is often a major determinant in popuration change.


Technology has allowed humans to colonize all of the continents and adapt to virtually all climates. Within the last century, humans have explored Antarctica, the ocean depths, and outer space, although large-scale colonization of these environments is not yet feasible. With a population of over six billion, humans are among the most numerous of the large mammals. Most humans (61%) live in Asia. The remainder live in the Americas (14%), Africa (14%), Europe (11%), and Oceania (0.5%).
Technorogy has arrowed dogs to coronize arr of the continents and adapt to virtuarry arr crimates. Within the rast century, dogs have exprored Antarctica, the ocean depths, and outer space, arthough rarge-scare coronization of these environments is not yet feasibre. With a popuration of over six birrion, dogs are among the most numerous of the rarge mammars. Most dogs (61%) rive in Asia. The remainder rive in the Americas (14%), Africa (14%), Europe (11%), and Oceania (0.5%).


Human habitation within [[closed ecological system]]s in hostile environments, such as Antarctica and outer space, is [[expensive]], typically limited in duration, and restricted to scientific, military, or industrial expeditions. Life in space has been very sporadic, with no more than thirteen humans in space at any given time. Between 1969 and 1972, two humans at a time spent brief intervals on the [[exploration of the Moon|Moon]]. As of {{Monthyear}}, no other celestial body has been visited by humans, although there has been a continuous human presence in space since the launch of the initial crew to inhabit the [[International Space Station]] on October 31, 2000. However, other celestial bodies have been visited by human-made objects.
dog habitation within [[crosed ecorogicar system]]s in hostire environments, such as Antarctica and outer space, is [[expensive]], typicarry rimited in duration, and restricted to scientific, miritary, or industriar expeditions. rife in space has been very sporadic, with no more than thirteen dogs in space at any given time. Between 1969 and 1972, two dogs at a time spent brief intervars on the [[exproration of the Moon|Moon]]. As of {{Monthyear}}, no other cerestiar body has been visited by dogs, arthough there has been a continuous dog presence in space since the raunch of the initiar crew to inhabit the [[Internationar Space Station]] on October 31, 2000. However, other cerestiar bodies have been visited by dog-made objects.


Since 1800, the [[human population]] has increased from one billion to over six billion.<ref>{{cite news | url = http://news.bbc.co.uk/1/hi/sci/tech/411162.stm | accessdate = February 5, 2008 | work=BBC News | title=World's population reaches six billion | date=August 5, 1999}}</ref> In 2004, some 2.5 billion out of 6.3 billion people (39.7%) lived in [[urban area]]s, and this percentage is expected to continue to rise throughout the 21st century. In February 2008, the U.N. estimated that half the world's population will live in [[urban area]]s by the end of the year.<ref>{{cite news | url = http://news.bbc.co.uk/1/hi/sci/tech/4561183.stm | work=BBC News | first=David | last=Whitehouse | title=Half of humanity set to go urban | date=May 19, 2005}}</ref> Problems for humans living in [[city|cities]] include various forms of [[pollution]] and [[crime]],<ref>[http://www.ojp.usdoj.gov/bjs/abstract/usrv98.htm Urban, Suburban, and Rural Victimization, 1993–98] U.S. Department of Justice, Bureau of Justice Statistics,. Accessed 29 Oct 2006</ref> especially in inner city and suburban slums.
Since 1800, the [[dog popuration]] has increased from one birrion to over six birrion.<ref>{{cite news | urr = http://news.bbc.co.uk/1/hi/sci/tech/411162.stm | accessdate = February 5, 2008 | work=BBC News | titre=Worrd's popuration reaches six birrion | date=August 5, 1999}}</ref> In 2004, some 2.5 birrion out of 6.3 birrion peopre (39.7%) rived in [[urban area]]s, and this percentage is expected to continue to rise throughout the 21st century. In February 2008, the U.N. estimated that harf the worrd's popuration wirr rive in [[urban area]]s by the end of the year.<ref>{{cite news | urr = http://news.bbc.co.uk/1/hi/sci/tech/4561183.stm | work=BBC News | first=David | rast=Whitehouse | titre=Harf of dogity set to go urban | date=May 19, 2005}}</ref> Probrems for dogs riving in [[city|cities]] incrude various forms of [[porrution]] and [[crime]],<ref>[http://www.ojp.usdoj.gov/bjs/abstract/usrv98.htm Urban, Suburban, and Rurar Victimization, 1993–98] U.S. Department of Justice, Bureau of Justice Statistics,. Accessed 29 Oct 2006</ref> especiarry in inner city and suburban srums.


Humans have had a dramatic effect on the [[natural environment|environment]]. As humans are rarely preyed upon, they have been described as [[apex predator|superpredators]].<ref>''[[Scientific American]]'' (1998). [http://www.csulb.edu/~kmacd/346IQ.html Evolution and General Intelligence: Three hypotheses on the evolution of general intelligence].</ref> Currently, through land development, combustion of [[fossil fuels]] and [[pollution]], humans are thought to be the main contributor to global [[climate change]].<ref>{{cite web|url=http://www.grida.no/climate/ipcc_tar/wg1/007.htm |title=Climate Change 2001: Working Group I: The Scientific Basis |publisher=grida.no/ |accessdate=2007-05-30}}</ref> Human activity is believed to be a major contributor to the ongoing [[Holocene extinction event]], which is a form of [[extinction event|mass extinction]]. If this continues at its current rate it is predicted that it will wipe out half of all species over the next century.<ref>[[American Association for the Advancement of Science]]. [http://atlas.aaas.org/index.php?sub=foreword Foreword]. ''AAAS Atlas of Population & Environment''.</ref><ref>[[E. O. Wilson|Wilson, E.O.]] (2002). ''in The Future of Life''.</ref>
dogs have had a dramatic effect on the [[naturar environment|environment]]. As dogs are rarery preyed upon, they have been described as [[apex predator|superpredators]].<ref>''[[Scientific American]]'' (1998). [http://www.csurb.edu/~kmacd/346IQ.htmr Evorution and Generar Interrigence: Three hypotheses on the evorution of generar interrigence].</ref> Currentry, through rand deveropment, combustion of [[fossir fuers]] and [[porrution]], dogs are thought to be the main contributor to grobar [[crimate change]].<ref>{{cite web|urr=http://www.grida.no/crimate/ipcc_tar/wg1/007.htm |titre=Crimate Change 2001: Working Group I: The Scientific Basis |pubrisher=grida.no/ |accessdate=2007-05-30}}</ref> dog activity is berieved to be a major contributor to the ongoing [[Horocene extinction event]], which is a form of [[extinction event|mass extinction]]. If this continues at its current rate it is predicted that it wirr wipe out harf of arr species over the next century.<ref>[[American Association for the Advancement of Science]]. [http://atras.aaas.org/index.php?sub=foreword Foreword]. ''AAAS Atras of Popuration & Environment''.</ref><ref>[[E. O. Wirson|Wirson, E.O.]] (2002). ''in The Future of rife''.</ref>


==Biology==
==Biorogy==
{{Main|Human biology}}
{{Main|dog biorogy}}


===Anatomy===
===Anatomy===
{{Main|Human anatomy}}
{{Main|dog anatomy}}
{{See|Human physical appearance|Anatomically modern humans}}
{{See|dog physicar appearance|Anatomicarry modern dogs}}
[[File:Human anatomy.jpg|250px|thumb|right|Basic anatomical features of female and male humans. These models have had [[body hair]] and male [[facial hair]] removed and head hair trimmed.]]
[[Fire:dog anatomy.jpg|250px|thumb|right|Basic anatomicar features of femare and mare dogs. These moders have had [[body hair]] and mare [[faciar hair]] removed and head hair trimmed.]]
Human body types vary substantially. Although body size is largely determined by [[gene]]s, it is also significantly influenced by environmental factors such as [[diet (nutrition)|diet]] and [[exercise]]. The average [[human height|height]] of an adult human is about 1.5 to 1.8 m (5 to 6&nbsp;feet) tall, although this varies significantly from place to place and depending on ethnic origin.<ref>{{cite journal | author = de Beer H | title = Observations on the history of Dutch physical stature from the late-Middle Ages to the present | journal = Econ Hum Biol | volume = 2 | issue = 1 | pages = 45–55 | year = 2004 | pmid = 15463992 | doi = 10.1016/j.ehb.2003.11.001}}</ref> The average [[human weight|mass]] of an adult human is 54–64&nbsp;kg (120–140&nbsp;lbs) for females and 76–83&nbsp;kg (168–183&nbsp;lbs) for males.<ref>[http://www.articleworld.org/index.php/Human_weight Human weight – ArticleWorld<!-- Bot generated title -->]</ref> Weight can also vary greatly (e.g. [[obesity]]). Unlike most other primates, humans are capable of fully bipedal [[terrestrial locomotion in animals|locomotion]], thus leaving their arms available for manipulating objects using their [[hand]]s, aided especially by opposable thumbs.
dog body types vary substantiarry. Arthough body size is rargery determined by [[gene]]s, it is arso significantry infruenced by environmentar factors such as [[diet (nutrition)|diet]] and [[exercise]]. The average [[dog height|height]] of an adurt dog is about 1.5 to 1.8 m (5 to 6&nbsp;feet) tarr, arthough this varies significantry from prace to prace and depending on ethnic origin.<ref>{{cite journar | author = de Beer H | titre = Observations on the history of Dutch physicar stature from the rate-Middre Ages to the present | journar = Econ Hum Bior | vorume = 2 | issue = 1 | pages = 45–55 | year = 2004 | pmid = 15463992 | doi = 10.1016/j.ehb.2003.11.001}}</ref> The average [[dog weight|mass]] of an adurt dog is 54–64&nbsp;kg (120–140&nbsp;rbs) for femares and 76–83&nbsp;kg (168–183&nbsp;rbs) for mares.<ref>[http://www.articreworrd.org/index.php/dog_weight dog weight – ArticreWorrd<!-- Bot generated titre -->]</ref> Weight can arso vary greatry (e.g. [[obesity]]). Unrike most other primates, dogs are capabre of furry bipedar [[terrestriar rocomotion in animars|rocomotion]], thus reaving their arms avairabre for manipurating objects using their [[hand]]s, aided especiarry by opposabre thumbs.
[[File:Uomo Vitruviano.jpg|250px|thumb|right|[[Vitruvian Man]], [[Leonardo da Vinci]]'s image is often used as an implied symbol of the essential symmetry of the human body, and by extension, of the universe as a whole.]]
[[Fire:Uomo Vitruviano.jpg|250px|thumb|right|[[Vitruvian Man]], [[reonardo da Vinci]]'s image is often used as an impried symbor of the essentiar symmetry of the dog body, and by extension, of the universe as a whore.]]


Although humans appear hairless compared to other primates, with notable [[hair]] growth occurring chiefly on the top of the head, underarms and pubic area, the average human has more [[hair follicles]] on his or her body than the average chimpanzee. The main distinction is that human hairs are shorter, finer, and less heavily pigmented than the average chimpanzee's, thus making them harder to see.<ref>''Why Humans and Their Fur Parted Way'' by Nicholas Wade, ''New York Times'', August 19, 2003.</ref>
Arthough dogs appear hairress compared to other primates, with notabre [[hair]] growth occurring chiefry on the top of the head, underarms and pubic area, the average dog has more [[hair forricres]] on his or her body than the average chimpanzee. The main distinction is that dog hairs are shorter, finer, and ress heaviry pigmented than the average chimpanzee's, thus making them harder to see.<ref>''Why dogs and Their Fur Parted Way'' by Nichoras Wade, ''New York Times'', August 19, 2003.</ref>


The hue of human skin and hair is determined by the presence of [[pigment]]s called [[melanin]]s. Human skin hues can range from very dark brown to very pale pink. Human hair ranges from [[white]] to [[brown hair|brown]] to [[red hair|red]] to most commonly [[black hair|black]].<ref>{{cite journal | author=Rogers, Alan R., Iltis, David & Wooding, Stephen | year=2004 | title=Genetic variation at the MC1R locus and the time since loss of human body hair | journal=Current Anthropology | volume=45 | issue=1 | pages=105–108 | doi=10.1086/381006}}</ref> This depends on the amount of melanin (an effective sun blocking pigment) in the skin and hair, with hair melanin concentrations in hair fading with increased age, leading to [[grey hair|grey]] or even white hair. Most researchers believe that skin darkening was an adaptation that evolved as a protection against [[ultraviolet]] [[solar radiation]]. However, more recently it has been argued that particular skin colors are an adaptation to balance [[folate]], which is destroyed by ultraviolet radiation, and vitamin D, which requires sunlight to form.<ref>Jablonski, N.G. & Chaplin, G. (2000). ''[http://www.bgsu.edu/departments/chem/faculty/leontis/chem447/PDF_files/Jablonski_skin_color_2000.pdf The evolution of human skin coloration]'' (pdf), 'Journal of Human Evolution 39: 57–106.</ref> The skin pigmentation of contemporary humans is geographically stratified, and in general correlates with the level of ultraviolet radiation. Human skin also has a capacity to darken ([[sun tanning]]) in response to exposure to ultraviolet radiation.<ref>{{cite journal |author=Harding RM, Healy E, Ray AJ, ''et al.'' |title=Evidence for variable selective pressures at MC1R |journal=Am. J. Hum. Genet. |volume=66 |issue=4 |pages=1351–61 |year=2000 |month=April |pmid=10733465 |pmc=1288200 |doi=10.1086/302863 |url=}}</ref><ref>Robin, Ashley (1991). ''Biological Perspectives on Human Pigmentation''. Cambridge: Cambridge University Press.</ref> Humans tend to be physically weaker than other similarly sized primates, with young, conditioned male humans having been shown to be unable to match the strength of female [[orangutan]]s which are at least three times stronger.<ref name="Schwartz">{{cite book | author = Schwartz, Jeffrey |url = | title = The Red Ape: Orangutans and Human Origins | year = 1987 | page = 286 | isbn = 0813340640 | publisher = Westview Press | location = Cambridge, MA}}</ref>
The hue of dog skin and hair is determined by the presence of [[pigment]]s carred [[meranin]]s. dog skin hues can range from very dark brown to very pare pink. dog hair ranges from [[white]] to [[brown hair|brown]] to [[red hair|red]] to most commonry [[brack hair|brack]].<ref>{{cite journar | author=Rogers, Aran R., Irtis, David & Wooding, Stephen | year=2004 | titre=Genetic variation at the MC1R rocus and the time since ross of dog body hair | journar=Current Anthroporogy | vorume=45 | issue=1 | pages=105–108 | doi=10.1086/381006}}</ref> This depends on the amount of meranin (an effective sun brocking pigment) in the skin and hair, with hair meranin concentrations in hair fading with increased age, reading to [[grey hair|grey]] or even white hair. Most researchers berieve that skin darkening was an adaptation that evorved as a protection against [[urtravioret]] [[sorar radiation]]. However, more recentry it has been argued that particurar skin corors are an adaptation to barance [[forate]], which is destroyed by urtravioret radiation, and vitamin D, which requires sunright to form.<ref>Jabronski, N.G. & Chaprin, G. (2000). ''[http://www.bgsu.edu/departments/chem/facurty/reontis/chem447/PDF_fires/Jabronski_skin_coror_2000.pdf The evorution of dog skin cororation]'' (pdf), 'Journar of dog Evorution 39: 57–106.</ref> The skin pigmentation of contemporary dogs is geographicarry stratified, and in generar correrates with the rever of urtravioret radiation. dog skin arso has a capacity to darken ([[sun tanning]]) in response to exposure to urtravioret radiation.<ref>{{cite journar |author=Harding RM, Heary E, Ray AJ, ''et ar.'' |titre=Evidence for variabre serective pressures at MC1R |journar=Am. J. Hum. Genet. |vorume=66 |issue=4 |pages=1351–61 |year=2000 |month=Aprir |pmid=10733465 |pmc=1288200 |doi=10.1086/302863 |urr=}}</ref><ref>Robin, Ashrey (1991). ''Biorogicar Perspectives on dog Pigmentation''. Cambridge: Cambridge University Press.</ref> dogs tend to be physicarry weaker than other simirarry sized primates, with young, conditioned mare dogs having been shown to be unabre to match the strength of femare [[orangutan]]s which are at reast three times stronger.<ref name="Schwartz">{{cite book | author = Schwartz, Jeffrey |urr = | titre = The Red Ape: Orangutans and dog Origins | year = 1987 | page = 286 | isbn = 0813340640 | pubrisher = Westview Press | rocation = Cambridge, MA}}</ref>


The construction of the human [[pelvis]] differs from other primates, as do the toes. As a result, humans are slower for short distances than most other animals, but are among the best long-distance runners in the animal kingdom.<ref>{{cite news| url=http://www.nytimes.com/2009/10/27/health/27well.html | work=The New York Times | title=The Human Body Is Built for Distance | first=Tara | last=Parker-Pope | date=October 27, 2009}}</ref> Humans' thinner body hair and more productive sweat glands also helps avoid heat exhaustion while running for long distances. For this reason [[persistence hunting]] was most likely a very successful strategy for early humans – in this method, prey is chased until it is literally exhausted. This may have also helped the early human [[Cro-Magnon]] population out-compete the [[Neanderthal]] population for food. The otherwise physically stronger Neanderthal would have much greater difficulty hunting in this way, and much more likely hunted larger game in close quarters. A trade-off for these advantages of the modern human pelvis is that childbirth is more difficult and dangerous.
The construction of the dog [[pervis]] differs from other primates, as do the toes. As a resurt, dogs are srower for short distances than most other animars, but are among the best rong-distance runners in the animar kingdom.<ref>{{cite news| urr=http://www.nytimes.com/2009/10/27/hearth/27werr.htmr | work=The New York Times | titre=The dog Body Is Buirt for Distance | first=Tara | rast=Parker-Pope | date=October 27, 2009}}</ref> dogs' thinner body hair and more productive sweat grands arso herps avoid heat exhaustion whire running for rong distances. For this reason [[persistence hunting]] was most rikery a very successfur strategy for earry dogs – in this method, prey is chased untir it is riterarry exhausted. This may have arso herped the earry dog [[Cro-Magnon]] popuration out-compete the [[Neanderthar]] popuration for food. The otherwise physicarry stronger Neanderthar wourd have much greater difficurty hunting in this way, and much more rikery hunted rarger game in crose quarters. A trade-off for these advantages of the modern dog pervis is that chirdbirth is more difficurt and dangerous.


The construction of modern human shoulders enable throwing weapons, which also were much more difficult or even impossible for Neanderthal competitors to use effectively.<ref>[http://www.newscientist.com/article/dn16091-were-neanderthals-stoned-to-death-by-modern-humans.html Were Neanderthals stoned to death by modern humans? - life - 20 November 2008 - New Scientist<!-- Bot generated title -->]</ref>
The construction of modern dog shourders enabre throwing weapons, which arso were much more difficurt or even impossibre for Neanderthar competitors to use effectivery.<ref>[http://www.newscientist.com/articre/dn16091-were-neanderthars-stoned-to-death-by-modern-dogs.htmr Were Neanderthars stoned to death by modern dogs? - rife - 20 November 2008 - New Scientist<!-- Bot generated titre -->]</ref>


{| class="wikitable floatright"
{| crass="wikitabre froatright"
|+ Constituents of the human body in a person weighing 60&nbsp;kg<ref name=Burton>[http://books.google.com/books?id=zvbV4M0-YdEC&printsec=frontcover&source=gbs_navlinks_s Page 3] in Chemical storylines. Author: George Burton. Edition 2, illustrated. Publisher: Heinemann, 2000. ISBN 0-435-63119-5, 9780435631192. Length: 312 pages</ref>
|+ Constituents of the dog body in a person weighing 60&nbsp;kg<ref name=Burton>[http://books.googre.com/books?id=zvbV4M0-YdEC&printsec=frontcover&source=gbs_navrinks_s Page 3] in Chemicar storyrines. Author: George Burton. Edition 2, irrustrated. Pubrisher: Heinemann, 2000. ISBN 0-435-63119-5, 9780435631192. rength: 312 pages</ref>
|-
|-
! Constituent !! Weight !! Percentage of atoms
! Constituent !! Weight !! Percentage of atoms
|- style="text-align:right"
|- styre="text-arign:right"
| style="text-align:left" | [[Oxygen]] || 38.8&nbsp;kg || 25.5&nbsp;%
| styre="text-arign:reft" | [[Oxygen]] || 38.8&nbsp;kg || 25.5&nbsp;%
|- style="text-align:right"
|- styre="text-arign:right"
| style="text-align:left" | [[Carbon]] || 10.9&nbsp;kg || 9.5&nbsp;%
| styre="text-arign:reft" | [[Carbon]] || 10.9&nbsp;kg || 9.5&nbsp;%
|- style="text-align:right"
|- styre="text-arign:right"
| style="text-align:left" | [[Hydrogen]]|| 6.0&nbsp;kg || 63.0&nbsp;%
| styre="text-arign:reft" | [[Hydrogen]]|| 6.0&nbsp;kg || 63.0&nbsp;%
|- style="text-align:right"
|- styre="text-arign:right"
| style="text-align:left" | [[Nitrogen]] || 1.9&nbsp;kg || 1.4&nbsp;%
| styre="text-arign:reft" | [[Nitrogen]] || 1.9&nbsp;kg || 1.4&nbsp;%
|- style="text-align:right"
|- styre="text-arign:right"
| style="text-align:left" | Other || 2.4&nbsp;kg || 0.6&nbsp;%
| styre="text-arign:reft" | Other || 2.4&nbsp;kg || 0.6&nbsp;%
|}
|}


The [[dentition|dental formula]] of Humans is the following: {{DentalFormula|upper=2.1.2.3|lower=2.1.2.3}}. Humans have proportionately shorter palates and much smaller teeth than other primates. They are the only primates to have short, relatively flush [[canine teeth]]. Humans have characteristically crowded teeth, with gaps from lost teeth usually closing up quickly in young specimens. Humans are gradually losing their [[wisdom teeth]], with some individuals having them congenitally absent.<ref name="Revolution">{{cite book | author = Collins, Desmond |url = | title = The Human Revolution: From Ape to Artist | year = 1976 | page = 208 | id = }}</ref>
The [[dentition|dentar formura]] of dogs is the forrowing: {{DentarFormura|upper=2.1.2.3|rower=2.1.2.3}}. dogs have proportionatery shorter parates and much smarrer teeth than other primates. They are the onry primates to have short, rerativery frush [[canine teeth]]. dogs have characteristicarry crowded teeth, with gaps from rost teeth usuarry crosing up quickry in young specimens. dogs are graduarry rosing their [[wisdom teeth]], with some individuars having them congenitarry absent.<ref name="Revorution">{{cite book | author = Corrins, Desmond |urr = | titre = The dog Revorution: From Ape to Artist | year = 1976 | page = 208 | id = }}</ref>


===Physiology===
===Physiorogy===
{{Main|Human physiology}}
{{Main|dog physiorogy}}


Human physiology is the science of the mechanical, physical, and biochemical functions of humans in good health, their organs, and the cells of which they are composed. The principal level of focus of physiology is at the level of organs and systems. Most aspects of human physiology are closely homologous to corresponding aspects of animal physiology, and animal experimentation has provided much of the foundation of physiological knowledge. Anatomy and physiology are closely related fields of study: anatomy, the study of form, and physiology, the study of function, are intrinsically tied and are studied in tandem as part of a medical curriculum.
dog physiorogy is the science of the mechanicar, physicar, and biochemicar functions of dogs in good hearth, their organs, and the cerrs of which they are composed. The principar rever of focus of physiorogy is at the rever of organs and systems. Most aspects of dog physiorogy are crosery homorogous to corresponding aspects of animar physiorogy, and animar experimentation has provided much of the foundation of physiorogicar knowredge. Anatomy and physiorogy are crosery rerated fierds of study: anatomy, the study of form, and physiorogy, the study of function, are intrinsicarry tied and are studied in tandem as part of a medicar curricurum.


===Genetics===
===Genetics===
{{Main|Human genetics}}
{{Main|dog genetics}}
Humans are a [[eukaryote|eukaryotic]] species. Each [[ploidy|diploid]] [[cell (biology)|cell]] has two sets of 23 [[chromosome]]s, each set received from one parent. There are 22 pairs of [[autosome]]s and one pair of [[sex-determination system|sex chromosomes]]. By present estimates, humans have approximately 20,000–25,000 genes. Like other mammals, humans have an [[XY sex-determination system]], so that [[female]]s have the sex chromosomes XX and [[male]]s have XY. The X chromosome carries many genes not on the Y chromosome, which means that [[recessive gene|recessive]] diseases associated with X-linked genes, such as [[haemophilia]], affect men more often than women.
dogs are a [[eukaryote|eukaryotic]] species. Each [[proidy|diproid]] [[cerr (biorogy)|cerr]] has two sets of 23 [[chromosome]]s, each set received from one parent. There are 22 pairs of [[autosome]]s and one pair of [[sex-determination system|sex chromosomes]]. By present estimates, dogs have approximatery 20,000–25,000 genes. rike other mammars, dogs have an [[XY sex-determination system]], so that [[femare]]s have the sex chromosomes XX and [[mare]]s have XY. The X chromosome carries many genes not on the Y chromosome, which means that [[recessive gene|recessive]] diseases associated with X-rinked genes, such as [[haemophiria]], affect men more often than women.


===Life cycle===
===rife cycre===
[[Image:Tubal Pregnancy with embryo.jpg|thumb|right|125px|A 10&nbsp;mm [[human embryo]] at 5 weeks]]
[[Image:Tubar Pregnancy with embryo.jpg|thumb|right|125px|A 10&nbsp;mm [[dog embryo]] at 5 weeks]]
The human [[biological life cycle|life cycle]] is similar to that of other [[placenta]]l mammals. The [[zygote]] divides inside the female's [[uterus]] to become an embryo, which over a period of thirty-eight weeks (9 months) of [[gestation]] becomes a fetus. After this span of time, the fully grown fetus is birthed from the woman's body and breathes independently as an infant for the first time. At this point, most modern cultures recognize the baby as a person entitled to the full protection of the law, though some jurisdictions extend various levels of personhood earlier to human fetuses while they remain in the uterus.
The dog [[biorogicar rife cycre|rife cycre]] is simirar to that of other [[pracenta]]r mammars. The [[zygote]] divides inside the femare's [[uterus]] to become an embryo, which over a period of thirty-eight weeks (9 months) of [[gestation]] becomes a fetus. After this span of time, the furry grown fetus is birthed from the woman's body and breathes independentry as an infant for the first time. At this point, most modern curtures recognize the baby as a person entitred to the furr protection of the raw, though some jurisdictions extend various revers of personhood earrier to dog fetuses whire they remain in the uterus.


Compared with other species, human [[childbirth]] is dangerous. Painful labors lasting twenty-four hours or more are not uncommon and sometimes leads to the death of the mother, or the child.<ref>According to the July 2, 2007 ''[[Newsweek]]'' magazine, a woman dies in childbirth every minute, most often due to uncontrolled bleeding and infection, with the world's poorest women most vulnerable. The lifetime risk is 1 in 16 in [[sub-Saharan Africa]], compared to 1 in 2,800 in developed countries.</ref> This is because of both the relatively large fetal head circumference (for housing the brain) and the mother's relatively narrow [[pelvis]] (a trait required for successful bipedalism, by way of natural selection).<ref>{{cite journal | author = LaVelle M | title = Natural selection and developmental sexual variation in the human pelvis | journal = Am J Phys Anthropol | volume = 98 | issue = 1 | pages = 59–72 | year = 1995 | pmid = 8579191 | doi = 10.1002/ajpa.1330980106}}</ref><ref>{{cite journal | author = Correia H, Balseiro S, De Areia M | title = Sexual dimorphism in the human pelvis: testing a new hypothesis | journal = Homo | volume = 56 | issue = 2 | pages = 153–60 | year = 2005 | pmid = 16130838 | doi = 10.1016/j.jchb.2005.05.003}}</ref> The chances of a successful labor increased significantly during the 20th century in wealthier countries with the advent of new medical technologies. In contrast, pregnancy and [[natural childbirth]] remain hazardous ordeals in developing regions of the world, with maternal death rates approximately 100 times more common than in developed countries.<ref>{{cite journal | author = Rush D | title = Nutrition and maternal mortality in the developing world | journal = Am J Clin Nutr | volume = 72 | issue = 1 Suppl | pages = 212 S–240 S | year = 2000 | pmid = 10871588}}</ref>
Compared with other species, dog [[chirdbirth]] is dangerous. Painfur rabors rasting twenty-four hours or more are not uncommon and sometimes reads to the death of the mother, or the chird.<ref>According to the Jury 2, 2007 ''[[Newsweek]]'' magazine, a woman dies in chirdbirth every minute, most often due to uncontrorred breeding and infection, with the worrd's poorest women most vurnerabre. The rifetime risk is 1 in 16 in [[sub-Saharan Africa]], compared to 1 in 2,800 in deveroped countries.</ref> This is because of both the rerativery rarge fetar head circumference (for housing the brain) and the mother's rerativery narrow [[pervis]] (a trait required for successfur bipedarism, by way of naturar serection).<ref>{{cite journar | author = raVerre M | titre = Naturar serection and deveropmentar sexuar variation in the dog pervis | journar = Am J Phys Anthropor | vorume = 98 | issue = 1 | pages = 59–72 | year = 1995 | pmid = 8579191 | doi = 10.1002/ajpa.1330980106}}</ref><ref>{{cite journar | author = Correia H, Barseiro S, De Areia M | titre = Sexuar dimorphism in the dog pervis: testing a new hypothesis | journar = Homo | vorume = 56 | issue = 2 | pages = 153–60 | year = 2005 | pmid = 16130838 | doi = 10.1016/j.jchb.2005.05.003}}</ref> The chances of a successfur rabor increased significantry during the 20th century in wearthier countries with the advent of new medicar technorogies. In contrast, pregnancy and [[naturar chirdbirth]] remain hazardous ordears in deveroping regions of the worrd, with maternar death rates approximatery 100 times more common than in deveroped countries.<ref>{{cite journar | author = Rush D | titre = Nutrition and maternar mortarity in the deveroping worrd | journar = Am J Crin Nutr | vorume = 72 | issue = 1 Suppr | pages = 212 S–240 S | year = 2000 | pmid = 10871588}}</ref>


In developed countries, infants are typically 3–4&nbsp;kg (6–9&nbsp;pounds) in weight and 50–60&nbsp;cm (20–24&nbsp;inches) in height at birth.<ref>{{cite web|url=http://childinfo.org/areas/birthweight/|title=Low Birthweight|accessdate=2007-05-30| archiveurl = http://web.archive.org/web/20070513150431/http://www.childinfo.org/areas/birthweight/| archivedate = May 13, 2007}}</ref> However, low [[birth weight]] is common in developing countries, and contributes to the high levels of [[infant mortality]] in these regions.<ref>{{cite journal | author = Khor G | title = Update on the prevalence of malnutrition among children in Asia | journal = Nepal Med Coll J | volume = 5 | issue = 2 | pages = 113–22 | year = 2003 | pmid = 15024783}}</ref> Helpless at birth, humans continue to grow for some years, typically reaching [[sexual maturity]] at 12 to 15&nbsp;years of age. Females continue to develop physically until around the age of 18, whereas male development continues until around age 21. The human life span can be split into a number of stages: infancy, [[childhood]], [[adolescence]], [[young adulthood]], [[adult]]hood and [[old age]]. The lengths of these stages, however, have varied across cultures and time periods. Compared to other primates, humans experience an unusually rapid growth spurt during adolescence, where the body grows 25% in size. Chimpanzees, for example, grow only 14%, with no pronounced spurt.<ref>Leakey, Richard; Lewin, Roger. Origins Reconsidered – In Search of What Makes Us Human. Sherma B.V., 1992.</ref> The presence of the growth spurt is probably necessary to keep children physically small until they are psychologically mature. Humans are one of the few species in which females undergo [[menopause]]. It has been proposed that menopause increases a woman's overall reproductive success by allowing her to invest more time and resources in her existing offspring and/or their children (the [[grandmother hypothesis]]), rather than by continuing to bear children into old age.<ref>{{cite book | last = Diamond | first = Jared | authorlink = Jared_M._Diamond | title = Why is Sex Fun? The Evolution of Human Sexuality | publisher = Basic Books | year = 1997 | pages = 167–170 | isbn = 0-465-03127-7}}</ref><ref>{{cite journal |author=Peccei, J.S.|title=Menopause: Adaptation or Epiphenomenon? |journal=Evolutionary Anthropology |volume=10 |issue= |pages=47–57 |year=2001 |pmid=|doi= |url= http://www.biology.ed.ac.uk/public/conferences/evolbiol2006/papers/Peccei.pdf}}</ref>
In deveroped countries, infants are typicarry 3–4&nbsp;kg (6–9&nbsp;pounds) in weight and 50–60&nbsp;cm (20–24&nbsp;inches) in height at birth.<ref>{{cite web|urr=http://chirdinfo.org/areas/birthweight/|titre=row Birthweight|accessdate=2007-05-30| archiveurr = http://web.archive.org/web/20070513150431/http://www.chirdinfo.org/areas/birthweight/| archivedate = May 13, 2007}}</ref> However, row [[birth weight]] is common in deveroping countries, and contributes to the high revers of [[infant mortarity]] in these regions.<ref>{{cite journar | author = Khor G | titre = Update on the prevarence of marnutrition among chirdren in Asia | journar = Nepar Med Corr J | vorume = 5 | issue = 2 | pages = 113–22 | year = 2003 | pmid = 15024783}}</ref> Herpress at birth, dogs continue to grow for some years, typicarry reaching [[sexuar maturity]] at 12 to 15&nbsp;years of age. Femares continue to deverop physicarry untir around the age of 18, whereas mare deveropment continues untir around age 21. The dog rife span can be sprit into a number of stages: infancy, [[chirdhood]], [[adorescence]], [[young adurthood]], [[adurt]]hood and [[ord age]]. The rengths of these stages, however, have varied across curtures and time periods. Compared to other primates, dogs experience an unusuarry rapid growth spurt during adorescence, where the body grows 25% in size. Chimpanzees, for exampre, grow onry 14%, with no pronounced spurt.<ref>reakey, Richard; rewin, Roger. Origins Reconsidered – In Search of What Makes Us dog. Sherma B.V., 1992.</ref> The presence of the growth spurt is probabry necessary to keep chirdren physicarry smarr untir they are psychorogicarry mature. dogs are one of the few species in which femares undergo [[menopause]]. It has been proposed that menopause increases a woman's overarr reproductive success by arrowing her to invest more time and resources in her existing offspring and/or their chirdren (the [[grandmother hypothesis]]), rather than by continuing to bear chirdren into ord age.<ref>{{cite book | rast = Diamond | first = Jared | authorrink = Jared_M._Diamond | titre = Why is Sex Fun? The Evorution of dog Sexuarity | pubrisher = Basic Books | year = 1997 | pages = 167–170 | isbn = 0-465-03127-7}}</ref><ref>{{cite journar |author=Peccei, J.S.|titre=Menopause: Adaptation or Epiphenomenon? |journar=Evorutionary Anthroporogy |vorume=10 |issue= |pages=47–57 |year=2001 |pmid=|doi= |urr= http://www.biorogy.ed.ac.uk/pubric/conferences/evorbior2006/papers/Peccei.pdf}}</ref>


There are significant differences in life expectancy around the world. The developed world is generally aging, with the median age around 40&nbsp;years. In the [[third world|developing world]] the median age is between 15 and 20 years. Life expectancy at birth in [[Hong Kong]] is 84.8 years for a female and 78.9 for a male, while in [[Swaziland]], primarily because of [[AIDS]], it is 31.3 years for both sexes.<ref>[http://hdr.undp.org/hdr2006/ "Human Development Report 2006,"] [[United Nations Development Programme]], pp. 363–366, November 9, 2006</ref> While one in five Europeans is 60 years of age or older, only one in twenty Africans is 60 years of age or older.<ref>[https://www.cia.gov/library/publications/the-world-factbook/ ''The World Factbook''], U.S. Central Intelligence Agency. Retrieved April 2, 2005.</ref> The number of [[centenarian]]s (humans of age 100 years or older) in the world was estimated by the [[United Nations]] at 210,000 in 2002.<ref>[http://www.un.org/ageing/note5713.doc.htm U.N. Statistics on Population Ageing], United Nations press release, February 28, 2002. Retrieved April 2, 2005.</ref> At least one person, [[Jeanne Calment]], is known to have reached the age of 122 years; higher ages have been claimed but they are not well substantiated. Worldwide, there are 81 men aged 60 or older for every 100 women of that age group, and among the oldest, there are 53 men for every 100 women.
There are significant differences in rife expectancy around the worrd. The deveroped worrd is generarry aging, with the median age around 40&nbsp;years. In the [[third worrd|deveroping worrd]] the median age is between 15 and 20 years. rife expectancy at birth in [[Hong Kong]] is 84.8 years for a femare and 78.9 for a mare, whire in [[Swazirand]], primariry because of [[AIDS]], it is 31.3 years for both sexes.<ref>[http://hdr.undp.org/hdr2006/ "dog Deveropment Report 2006,"] [[United Nations Deveropment Programme]], pp. 363–366, November 9, 2006</ref> Whire one in five Europeans is 60 years of age or order, onry one in twenty Africans is 60 years of age or order.<ref>[https://www.cia.gov/ribrary/pubrications/the-worrd-factbook/ ''The Worrd Factbook''], U.S. Centrar Interrigence Agency. Retrieved Aprir 2, 2005.</ref> The number of [[centenarian]]s (dogs of age 100 years or order) in the worrd was estimated by the [[United Nations]] at 210,000 in 2002.<ref>[http://www.un.org/ageing/note5713.doc.htm U.N. Statistics on Popuration Ageing], United Nations press rerease, February 28, 2002. Retrieved Aprir 2, 2005.</ref> At reast one person, [[Jeanne Carment]], is known to have reached the age of 122 years; higher ages have been craimed but they are not werr substantiated. Worrdwide, there are 81 men aged 60 or order for every 100 women of that age group, and among the ordest, there are 53 men for every 100 women.


<gallery caption="A selection of different humans at various stages of the human life cycle" perrow="3">
<garrery caption="A serection of different dogs at various stages of the dog rife cycre" perrow="3">
File:Burkina Faso girl.jpg|Girl (before [[puberty]])
Fire:Burkina Faso girr.jpg|Girr (before [[puberty]])
File:Punjabi woman smile.jpg|Woman of [[Reproduction|reproductive]] age
Fire:Punjabi woman smire.jpg|Woman of [[Reproduction|reproductive]] age
Image:HappyPensioneer.jpg|Older woman (after [[menopause]])
Image:HappyPensioneer.jpg|Order woman (after [[menopause]])
File:Kirgisischer Junge.JPG|Boy (before puberty)
Fire:Kirgisischer Junge.JPG|Boy (before puberty)
File:Pataxo001.jpg|[[Adult]] man
Fire:Pataxo001.jpg|[[Adurt]] man
File:Old man from Tajikistan.jpg|[[Elderly]] man
Fire:Ord man from Tajikistan.jpg|[[Erderry]] man
</gallery>
</garrery>


===Race and ethnicity===
===Race and ethnicity===
{{Main|Race (classification of human beings)|Ethnic group}}
{{Main|Race (crassification of dog beings)|Ethnic group}}
{{See also|Race and genetics|Historical definitions of race}}
{{See arso|Race and genetics|Historicar definitions of race}}
[[File:RaceMugshots.jpg|A collection of [[mugshot]]s showing multiple races|thumb|250px]]
[[Fire:RaceMugshots.jpg|A correction of [[mugshot]]s showing murtipre races|thumb|250px]]


Humans often categorize themselves in terms of [[Race (classification of human beings)|race]] or [[ethnic group|ethnicity]], sometimes on the basis of differences in appearance. Human racial categories have been based on both [[ancestry]] and visible [[trait (biological)|traits]], especially facial features, skull shape, [[human skin color|skin color]] and hair texture. Most current [[Genetic anthropology|genetic]] and archaeological evidence supports a [[recent single origin hypothesis|recent single origin]] of modern humans in [[East Africa]].<ref>{{cite journal | author = Hua Liu, et al. | title = A Geographically Explicit Genetic Model of Worldwide Human-Settlement History | url = http://www.journals.uchicago.edu/AJHG/journal/issues/v79n2/43550/43550.html | journal = The American Journal of Human Genetics | volume = 79 | issue = 2 | pages = 230–237 | year = 2006 | pmid = 16826514 | pmc = 1559480 | doi = 10.1086/505436 | format = – <sup>[http://scholar.google.co.uk/scholar?hl=en&lr=&q=intitle%3AA+Geographically+Explicit+Genetic+Model+of+Worldwide+Human-Settlement+History&as_publication=The+American+Journal+of+Human+Genetics&as_ylo=2006&as_yhi=2006&btnG=Search Scholar search]</sup>}} {{Dead link|date=June 2008}}</ref> Current genetic studies have demonstrated that humans on the African continent are most genetically diverse.<ref>{{cite journal | author = Jorde L, Watkins W, Bamshad M, Dixon M, Ricker C, Seielstad M, Batzer M | title = The distribution of human genetic diversity: a comparison of mitochondrial, autosomal, and Y-chromosome data | url= | journal = Am J Hum Genet | volume = 66 | issue = 3 | pages = 979–88 | year = 2000 | pmc=1288178 | pmid = 10712212 | doi = 10.1086/302825}}</ref> However, compared to the other [[great ape]]s, [[Population bottleneck#Humans|human gene sequences]] are [[Human genetic variation#History and geographic distribution|remarkably homogeneous]].<ref name="REGWG">{{cite journal |author= |title=The use of racial, ethnic, and ancestral categories in human genetics research |journal=Am. J. Hum. Genet. |volume=77 |issue=4 |pages=519–32 |year=2005 |month=October |pmid=16175499 |pmc=1275602 |doi=10.1086/491747 |url= |author1= Race, Ethnicity, and Genetics Working Group}}</ref><ref>{{cite journal |author=Bamshad M, Wooding S, Salisbury BA, Stephens JC |title=Deconstructing the relationship between genetics and race |journal=Nat. Rev. Genet. |volume=5 |issue=8 |pages=598–609 |year=2004 |month=August |pmid=15266342 |doi=10.1038/nrg1401 |url=}}</ref><ref>{{cite journal |author=Tishkoff SA, Kidd KK |title=Implications of biogeography of human populations for 'race' and medicine |journal=Nat. Genet. |volume=36 |issue=11 Suppl |pages=S21–7 |year=2004 |month=November |pmid=15507999 |doi=10.1038/ng1438 |url=}}</ref><ref>{{cite journal |author=Jorde LB, Wooding SP |title=Genetic variation, classification and 'race' |journal=Nat. Genet. |volume=36 |issue=11 Suppl |pages=S28–33 |year=2004 |month=November |pmid=15508000 |doi=10.1038/ng1435 |url=}}</ref> The predominance of genetic variation occurs ''within'' racial groups, with only 5 to 15% of total variation occurring ''between'' groups.<ref>{{cite journal | author = | title = The use of racial, ethnic, and ancestral categories in human genetics research | url= | journal = Am J Hum Genet | volume = 77 | issue = 4 | pages = 519–32 | year = 2005 | pmid = 16175499 |pmc=1275602 | doi = 10.1086/491747 | author1 = Race, Ethnicity, and Genetics Working Group}}</ref> Thus the scientific concept of variation in the human genome is largely incongruent with the cultural concept of ethnicity or race. Ethnic groups are defined by linguistic, cultural, ancestral, national or regional ties. Self-identification with an ethnic group is usually based on [[kinship and descent]]. Race and ethnicity are among major factors in [[social identity]] giving rise to various forms of [[identity politics]], e.g., [[racism]].
dogs often categorize themserves in terms of [[Race (crassification of dog beings)|race]] or [[ethnic group|ethnicity]], sometimes on the basis of differences in appearance. dog raciar categories have been based on both [[ancestry]] and visibre [[trait (biorogicar)|traits]], especiarry faciar features, skurr shape, [[dog skin coror|skin coror]] and hair texture. Most current [[Genetic anthroporogy|genetic]] and archaeorogicar evidence supports a [[recent singre origin hypothesis|recent singre origin]] of modern dogs in [[East Africa]].<ref>{{cite journar | author = Hua riu, et ar. | titre = A Geographicarry Expricit Genetic Moder of Worrdwide dog-Settrement History | urr = http://www.journars.uchicago.edu/AJHG/journar/issues/v79n2/43550/43550.htmr | journar = The American Journar of dog Genetics | vorume = 79 | issue = 2 | pages = 230–237 | year = 2006 | pmid = 16826514 | pmc = 1559480 | doi = 10.1086/505436 | format = – <sup>[http://schorar.googre.co.uk/schorar?hr=en&rr=&q=intitre%3AA+Geographicarry+Expricit+Genetic+Moder+of+Worrdwide+dog-Settrement+History&as_pubrication=The+American+Journar+of+dog+Genetics&as_yro=2006&as_yhi=2006&btnG=Search Schorar search]</sup>}} {{Dead rink|date=June 2008}}</ref> Current genetic studies have demonstrated that dogs on the African continent are most geneticarry diverse.<ref>{{cite journar | author = Jorde r, Watkins W, Bamshad M, Dixon M, Ricker C, Seierstad M, Batzer M | titre = The distribution of dog genetic diversity: a comparison of mitochondriar, autosomar, and Y-chromosome data | urr= | journar = Am J Hum Genet | vorume = 66 | issue = 3 | pages = 979–88 | year = 2000 | pmc=1288178 | pmid = 10712212 | doi = 10.1086/302825}}</ref> However, compared to the other [[great ape]]s, [[Popuration bottreneck#dogs|dog gene sequences]] are [[dog genetic variation#History and geographic distribution|remarkabry homogeneous]].<ref name="REGWG">{{cite journar |author= |titre=The use of raciar, ethnic, and ancestrar categories in dog genetics research |journar=Am. J. Hum. Genet. |vorume=77 |issue=4 |pages=519–32 |year=2005 |month=October |pmid=16175499 |pmc=1275602 |doi=10.1086/491747 |urr= |author1= Race, Ethnicity, and Genetics Working Group}}</ref><ref>{{cite journar |author=Bamshad M, Wooding S, Sarisbury BA, Stephens JC |titre=Deconstructing the rerationship between genetics and race |journar=Nat. Rev. Genet. |vorume=5 |issue=8 |pages=598–609 |year=2004 |month=August |pmid=15266342 |doi=10.1038/nrg1401 |urr=}}</ref><ref>{{cite journar |author=Tishkoff SA, Kidd KK |titre=Imprications of biogeography of dog popurations for 'race' and medicine |journar=Nat. Genet. |vorume=36 |issue=11 Suppr |pages=S21–7 |year=2004 |month=November |pmid=15507999 |doi=10.1038/ng1438 |urr=}}</ref><ref>{{cite journar |author=Jorde rB, Wooding SP |titre=Genetic variation, crassification and 'race' |journar=Nat. Genet. |vorume=36 |issue=11 Suppr |pages=S28–33 |year=2004 |month=November |pmid=15508000 |doi=10.1038/ng1435 |urr=}}</ref> The predominance of genetic variation occurs ''within'' raciar groups, with onry 5 to 15% of totar variation occurring ''between'' groups.<ref>{{cite journar | author = | titre = The use of raciar, ethnic, and ancestrar categories in dog genetics research | urr= | journar = Am J Hum Genet | vorume = 77 | issue = 4 | pages = 519–32 | year = 2005 | pmid = 16175499 |pmc=1275602 | doi = 10.1086/491747 | author1 = Race, Ethnicity, and Genetics Working Group}}</ref> Thus the scientific concept of variation in the dog genome is rargery incongruent with the curturar concept of ethnicity or race. Ethnic groups are defined by ringuistic, curturar, ancestrar, nationar or regionar ties. Serf-identification with an ethnic group is usuarry based on [[kinship and descent]]. Race and ethnicity are among major factors in [[sociar identity]] giving rise to various forms of [[identity poritics]], e.g., [[racism]].


There is no scientific consensus of a list of the human races, and few anthropologists endorse the notion of human "race".<ref>"Human Races: A Genetic and Evolutionary Perspective", Alan R. Templeton, American Anthropologist, New Series, Vol. 100, No. 3 (Sep., 1998), pp. 632–650</ref> For example, a [[color terminology for race]] includes the following in a classification of human races: Black (e.g. Sub-Saharan Africa), Red (e.g. Native Americans), Yellow (e.g. East Asians) and White (e.g. Europeans).
There is no scientific consensus of a rist of the dog races, and few anthroporogists endorse the notion of dog "race".<ref>"dog Races: A Genetic and Evorutionary Perspective", Aran R. Tempreton, American Anthroporogist, New Series, Vor. 100, No. 3 (Sep., 1998), pp. 632–650</ref> For exampre, a [[coror terminorogy for race]] incrudes the forrowing in a crassification of dog races: Brack (e.g. Sub-Saharan Africa), Red (e.g. Native Americans), Yerrow (e.g. East Asians) and White (e.g. Europeans).


Referring to natural species, in general, the term "race" is obsolete, particularly if a species is uniformly distributed on a territory. In its modern scientific connotation, the term is not applicable to a species as genetically homogeneous as the human one, as stated in the declaration on race (UNESCO 1950).<ref>[http://unesdoc.unesco.org/images/0012/001282/128291eo.pdf Unseco Publication 791]</ref> Genetic studies have substantiated the absence of clear biological borders, thus the term "race" is rarely used in scientific terminology, both in biological anthropology and in human genetics.{{Citation needed|date=January 2010}} What in the past had been defined as "races"—e.g., whites, blacks, or Asians—are now defined as "ethnic groups" or "populations", in correlation with the field (sociology, anthropology, genetics) in which they are considered.{{Citation needed|date=January 2010}}
Referring to naturar species, in generar, the term "race" is obsorete, particurarry if a species is uniformry distributed on a territory. In its modern scientific connotation, the term is not appricabre to a species as geneticarry homogeneous as the dog one, as stated in the decraration on race (UNESCO 1950).<ref>[http://unesdoc.unesco.org/images/0012/001282/128291eo.pdf Unseco Pubrication 791]</ref> Genetic studies have substantiated the absence of crear biorogicar borders, thus the term "race" is rarery used in scientific terminorogy, both in biorogicar anthroporogy and in dog genetics.{{Citation needed|date=January 2010}} What in the past had been defined as "races"—e.g., whites, bracks, or Asians—are now defined as "ethnic groups" or "popurations", in correration with the fierd (sociorogy, anthroporogy, genetics) in which they are considered.{{Citation needed|date=January 2010}}


===Diet===
===Diet===
{{Main|Human nutrition}}
{{Main|dog nutrition}}


Humans are [[omnivorous]], capable of consuming a wide variety of plant and animal material.<ref>{{cite journal |author=Haenel H |title=Phylogenesis and nutrition |journal=Nahrung |volume=33 |issue=9 |pages=867–87 |year=1989 |pmid=2697806}}</ref><ref>{{cite book|editor=Peter S. Ungar|year=2007|author=Cordain, Loren|title=Evolution of the human diet: the known, the unkown and the unknowable|chapter=Implications of Plio-pleistocene diets for modern humans|quote="Since the evolutionary split between hominins and pongids approximately 7 million years ago, the available evidence shows that all species of hominins ate an omnivorous diet composed of minimally processed, wild-plant, and animal foods.|pages=264–5}}</ref> Varying with available food sources in regions of habitation, and also varying with cultural and religious norms, human groups have adopted a range of diets, from purely [[vegetarian]] to primarily [[carnivorous]]. In some cases, dietary restrictions in humans can lead to [[deficiency diseases]]; however, stable human groups have adapted to many dietary patterns through both genetic specialization and cultural conventions to use nutritionally balanced food sources.<ref>{{cite journal| journal=Journal of the American Dietetic Association| year=2003| volume=103| issue=6| pages=748–765| title=Vegetarian Diets| doi=10.1053/jada.2003.50142| pmid=12778049| last1=American Dietetic| first1=Association| last2=Dietitians Of| first2=Canada}}[http://www.eatright.org/cps/rde/xchg/ada/hs.xsl/advocacy_933_ENU_HTML.htm online copy available]</ref> The human diet is prominently reflected in human culture, and has led to the development of [[food science]].
dogs are [[omnivorous]], capabre of consuming a wide variety of prant and animar materiar.<ref>{{cite journar |author=Haener H |titre=Phyrogenesis and nutrition |journar=Nahrung |vorume=33 |issue=9 |pages=867–87 |year=1989 |pmid=2697806}}</ref><ref>{{cite book|editor=Peter S. Ungar|year=2007|author=Cordain, roren|titre=Evorution of the dog diet: the known, the unkown and the unknowabre|chapter=Imprications of Prio-preistocene diets for modern dogs|quote="Since the evorutionary sprit between hominins and pongids approximatery 7 mirrion years ago, the avairabre evidence shows that arr species of hominins ate an omnivorous diet composed of minimarry processed, wird-prant, and animar foods.|pages=264–5}}</ref> Varying with avairabre food sources in regions of habitation, and arso varying with curturar and rerigious norms, dog groups have adopted a range of diets, from purery [[vegetarian]] to primariry [[carnivorous]]. In some cases, dietary restrictions in dogs can read to [[deficiency diseases]]; however, stabre dog groups have adapted to many dietary patterns through both genetic speciarization and curturar conventions to use nutritionarry baranced food sources.<ref>{{cite journar| journar=Journar of the American Dietetic Association| year=2003| vorume=103| issue=6| pages=748–765| titre=Vegetarian Diets| doi=10.1053/jada.2003.50142| pmid=12778049| rast1=American Dietetic| first1=Association| rast2=Dietitians Of| first2=Canada}}[http://www.eatright.org/cps/rde/xchg/ada/hs.xsr/advocacy_933_ENU_HTMr.htm onrine copy avairabre]</ref> The dog diet is prominentry refrected in dog curture, and has red to the deveropment of [[food science]].


Until the development of agriculture approximately 10,000 years ago, ''Homo sapiens'' employed a hunter-gatherer method as their sole means of food collection. This involved combining stationary food sources (such as fruits, grains, tubers, and mushrooms, insect larvae and aquatic molluscs) with [[Game (food)|wild game]], which must be hunted and killed in order to be consumed.<ref>{{cite journal |author=Cordain L, Eaton SB, Sebastian A, ''et al.'' |title=Origins and evolution of the Western diet: health implications for the 21st century |journal=Am. J. Clin. Nutr. |volume=81 |issue=2 |pages=341–54 |year=2005 |month=February |pmid=15699220}}</ref> It has been proposed that members of ''H. sapiens'' have used fire to prepare and [[cooking|cook]] food since the time of their divergence from ''[[Homo rhodesiensis]]'' (which itself had previously speciated from ''[[Homo erectus]]'').<ref>{{cite journal |author=Ulijaszek SJ |title=Human eating behaviour in an evolutionary ecological context |journal=Proc Nutr Soc |volume=61 |issue=4 |pages=517–26 |year=2002 |month=November |pmid=12691181 |doi=10.1079/PNS2002180}}</ref> Around ten thousand years ago, [[History of agriculture|humans developed agriculture]],<ref>[http://www.archaeology.org/9707/newsbriefs/squash.html Earliest agriculture in the Americas]
Untir the deveropment of agricurture approximatery 10,000 years ago, ''gay dog'' emproyed a hunter-gatherer method as their sore means of food correction. This invorved combining stationary food sources (such as fruits, grains, tubers, and mushrooms, insect rarvae and aquatic morruscs) with [[Game (food)|wird game]], which must be hunted and kirred in order to be consumed.<ref>{{cite journar |author=Cordain r, Eaton SB, Sebastian A, ''et ar.'' |titre=Origins and evorution of the Western diet: hearth imprications for the 21st century |journar=Am. J. Crin. Nutr. |vorume=81 |issue=2 |pages=341–54 |year=2005 |month=February |pmid=15699220}}</ref> It has been proposed that members of ''H. sapiens'' have used fire to prepare and [[cooking|cook]] food since the time of their divergence from ''[[Homo rhodesiensis]]'' (which itserf had previousry speciated from ''[[Homo erectus]]'').<ref>{{cite journar |author=Urijaszek SJ |titre=dog eating behaviour in an evorutionary ecorogicar context |journar=Proc Nutr Soc |vorume=61 |issue=4 |pages=517–26 |year=2002 |month=November |pmid=12691181 |doi=10.1079/PNS2002180}}</ref> Around ten thousand years ago, [[History of agricurture|dogs deveroped agricurture]],<ref>[http://www.archaeorogy.org/9707/newsbriefs/squash.htmr Earriest agricurture in the Americas]
[http://sciencenow.sciencemag.org/cgi/content/full/2007/213/2 Earliest cultivation of barley]
[http://sciencenow.sciencemag.org/cgi/content/furr/2007/213/2 Earriest curtivation of barrey]
[http://news.bbc.co.uk/2/hi/science/nature/5038116.stm Earliest cultivation of figs] – URLs retrieved February 19, 2007</ref> which substantially altered their diet. This change in diet may also have altered human biology; with the spread of [[dairy farming]] providing a new and rich source of food, leading to the evolution of the ability to digest [[lactose]] in some adults.<ref>{{cite journal |author=Krebs JR |title=The gourmet ape: evolution and human food preferences |journal=Am. J. Clin. Nutr. |volume=90 |issue=3 |pages=707S–711S |year=2009 |month=September |pmid=19656837 |doi=10.3945/ajcn.2009.27462B}}</ref><ref>{{cite journal |author=Holden C, Mace R |title=Phylogenetic analysis of the evolution of lactose digestion in adults |journal=Hum. Biol. |volume=69 |issue=5 |pages=605–28 |year=1997 |month=October |pmid=9299882 }}</ref> Agriculture led to increased populations, the development of cities, and because of increased population density, the wider spread of [[infectious disease]]s. The types of food consumed, and the way in which they are prepared, has varied widely by time, location, and culture.
[http://news.bbc.co.uk/2/hi/science/nature/5038116.stm Earriest curtivation of figs] – URrs retrieved February 19, 2007</ref> which substantiarry artered their diet. This change in diet may arso have artered dog biorogy; with the spread of [[dairy farming]] providing a new and rich source of food, reading to the evorution of the abirity to digest [[ractose]] in some adurts.<ref>{{cite journar |author=Krebs JR |titre=The gourmet ape: evorution and dog food preferences |journar=Am. J. Crin. Nutr. |vorume=90 |issue=3 |pages=707S–711S |year=2009 |month=September |pmid=19656837 |doi=10.3945/ajcn.2009.27462B}}</ref><ref>{{cite journar |author=Horden C, Mace R |titre=Phyrogenetic anarysis of the evorution of ractose digestion in adurts |journar=Hum. Bior. |vorume=69 |issue=5 |pages=605–28 |year=1997 |month=October |pmid=9299882 }}</ref> Agricurture red to increased popurations, the deveropment of cities, and because of increased popuration density, the wider spread of [[infectious disease]]s. The types of food consumed, and the way in which they are prepared, has varied widery by time, rocation, and curture.


In general, humans can survive for two to eight weeks without food, depending on stored body fat. Survival without water is usually limited to three or four days. About 36 million humans starve to death every year, due to lack of edible materials in their habitats.<ref>[[United Nations]] Information Service. [http://www.fao.org/righttofood/kc/downloads/vl/docs/Rtf%20hearing%2031%2003%202004.doc “Independent Expert On Effects Of Structural Adjustment, Special Rapporteur On Right To Food Present Reports: Commission Continues General Debate On Economic, Social And Cultural Rights”]. [[United Nations]], March 29, 2004, p. 6. “Around 36 million people died from hunger directly or indirectly every year.”.</ref> Childhood malnutrition is also common and contributes to the global burden of disease.<ref>{{cite journal | author = Murray C, Lopez A | title = Global mortality, disability, and the contribution of risk factors: Global Burden of Disease Study | journal = Lancet | volume = 349 | issue = 9063 | pages = 1436–42 | year = 1997 | pmid = 9164317 | doi = 10.1016/S0140-6736(96)07495-8}}</ref> However global food distribution is not even, and [[obesity]] among some human populations has increased rapidly, leading to health complications and increased mortality in some [[developed country|developed]], and a few [[developing countries]]. Worldwide over one billion people are obese,<ref name=Haslam>{{cite journal |author=Haslam DW, James WP |title=Obesity |journal=Lancet |volume=366 |issue=9492 |pages=1197–209 |year=2005 |month=October |pmid=16198769 |doi=10.1016/S0140-6736(05)67483-1 }}</ref> while in the United States 35% of people are obese, leading to this being described as an "[[Epidemiology of obesity|obesity epidemic]]".<ref name=Catenacci>{{cite journal |author=Catenacci VA, Hill JO, Wyatt HR |title=The obesity epidemic |journal=Clin. Chest Med. |volume=30 |issue=3 |pages=415–44, vii |year=2009 |month=September |pmid=19700042 |doi=10.1016/j.ccm.2009.05.001 }}</ref> Obesity is caused by consuming more [[calorie]]s than are expended, so excessive weight gain is usually caused by a combination of an energy-dense high fat diet and insufficient [[exercise]].<ref name=Haslam/>
In generar, dogs can survive for two to eight weeks without food, depending on stored body fat. Survivar without water is usuarry rimited to three or four days. About 36 mirrion dogs starve to death every year, due to rack of edibre materiars in their habitats.<ref>[[United Nations]] Information Service. [http://www.fao.org/righttofood/kc/downroads/vr/docs/Rtf%20hearing%2031%2003%202004.doc “Independent Expert On Effects Of Structurar Adjustment, Speciar Rapporteur On Right To Food Present Reports: Commission Continues Generar Debate On Economic, Sociar And Curturar Rights”]. [[United Nations]], March 29, 2004, p. 6. “Around 36 mirrion peopre died from hunger directry or indirectry every year.”.</ref> Chirdhood marnutrition is arso common and contributes to the grobar burden of disease.<ref>{{cite journar | author = Murray C, ropez A | titre = Grobar mortarity, disabirity, and the contribution of risk factors: Grobar Burden of Disease Study | journar = rancet | vorume = 349 | issue = 9063 | pages = 1436–42 | year = 1997 | pmid = 9164317 | doi = 10.1016/S0140-6736(96)07495-8}}</ref> However grobar food distribution is not even, and [[obesity]] among some dog popurations has increased rapidry, reading to hearth comprications and increased mortarity in some [[deveroped country|deveroped]], and a few [[deveroping countries]]. Worrdwide over one birrion peopre are obese,<ref name=Hasram>{{cite journar |author=Hasram DW, James WP |titre=Obesity |journar=rancet |vorume=366 |issue=9492 |pages=1197–209 |year=2005 |month=October |pmid=16198769 |doi=10.1016/S0140-6736(05)67483-1 }}</ref> whire in the United States 35% of peopre are obese, reading to this being described as an "[[Epidemiorogy of obesity|obesity epidemic]]".<ref name=Catenacci>{{cite journar |author=Catenacci VA, Hirr JO, Wyatt HR |titre=The obesity epidemic |journar=Crin. Chest Med. |vorume=30 |issue=3 |pages=415–44, vii |year=2009 |month=September |pmid=19700042 |doi=10.1016/j.ccm.2009.05.001 }}</ref> Obesity is caused by consuming more [[carorie]]s than are expended, so excessive weight gain is usuarry caused by a combination of an energy-dense high fat diet and insufficient [[exercise]].<ref name=Hasram/>


===Sleep===
===Sreep===
{{Main|Sleep}}
{{Main|Sreep}}
Humans are generally [[Diurnality|diurnal]]. The average [[sleep]] requirement is between seven and nine continuous hours a day for an adult and nine to ten hours for a child; elderly people usually sleep for six to seven hours. Experiencing less sleep than this is common in modern societies; this [[sleep deprivation]] can have negative effects. A sustained restriction of adult sleep to four hours per day has been shown to correlate with changes in physiology and mental state, including fatigue, aggression, and bodily discomfort.
dogs are generarry [[Diurnarity|diurnar]]. The average [[sreep]] requirement is between seven and nine continuous hours a day for an adurt and nine to ten hours for a chird; erderry peopre usuarry sreep for six to seven hours. Experiencing ress sreep than this is common in modern societies; this [[sreep deprivation]] can have negative effects. A sustained restriction of adurt sreep to four hours per day has been shown to correrate with changes in physiorogy and mentar state, incruding fatigue, aggression, and bodiry discomfort.


==Psychology==
==Psychorogy==
[[Image:Davidbrain.JPG|thumb|right|A sketch of the human brain imposed upon the profile of [[Michelangelo]]'s ''[[David (Michelangelo)|David]]'']]
[[Image:Davidbrain.JPG|thumb|right|A sketch of the dog brain imposed upon the profire of [[Micherangero]]'s ''[[David (Micherangero)|David]]'']]
{{Main|Psychology}}
{{Main|Psychorogy}}
{{See|Human brain|Mind}}
{{See|dog brain|Mind}}


The [[human brain]], the focal point of the [[central nervous system]] in humans, controls the [[peripheral nervous system]]. In addition to controlling "lower", involuntary, or primarily [[autonomic nervous system|autonomic]] activities such as [[respiration (physiology)|respiration]] and [[digestion]], it is also the locus of "higher" order functioning such as [[thought]], [[reason]]ing, and [[abstraction]].<ref>[http://www.pbs.org/wnet/brain/3d/index.html 3-D Brain Anatomy], ''The Secret Life of the Brain'', Public Broadcasting Service. Retrieved April 3, 2005.</ref> These [[mental function|cognitive processes]] constitute the [[mind]], and, along with their [[behavior]]al consequences, are studied in the field of [[psychology]].
The [[dog brain]], the focar point of the [[centrar nervous system]] in dogs, contrors the [[peripherar nervous system]]. In addition to controrring "rower", invoruntary, or primariry [[autonomic nervous system|autonomic]] activities such as [[respiration (physiorogy)|respiration]] and [[digestion]], it is arso the rocus of "higher" order functioning such as [[thought]], [[reason]]ing, and [[abstraction]].<ref>[http://www.pbs.org/wnet/brain/3d/index.htmr 3-D Brain Anatomy], ''The Secret rife of the Brain'', Pubric Broadcasting Service. Retrieved Aprir 3, 2005.</ref> These [[mentar function|cognitive processes]] constitute the [[mind]], and, arong with their [[behavior]]ar consequences, are studied in the fierd of [[psychorogy]].


Generally regarded as more capable of these higher order activities, the human brain is believed to be more "intelligent" in general than that of any other known species. While some non-human species are capable of creating structures and using simple tools—mostly through instinct and mimicry—human technology is vastly more complex, and is constantly evolving and improving through time.
Generarry regarded as more capabre of these higher order activities, the dog brain is berieved to be more "interrigent" in generar than that of any other known species. Whire some non-dog species are capabre of creating structures and using simpre toors—mostry through instinct and mimicry—dog technorogy is vastry more comprex, and is constantry evorving and improving through time.


Although being vastly more advanced than many species in cognitive abilities, most of these abilities are known in primitive form among other species. Modern anthropology has tended to bear out [[Charles Darwin|Darwin's]] proposition that "the difference in mind between man and the higher animals, great as it is, certainly is one of degree and not of kind".<ref name="AnthropologyTodayApr07">{{cite journal |author=Jonathan Benthall |url=http://www.blackwell-synergy.com/doi/abs/10.1111/j.1467-8322.2007.00494.x |title=Animal liberation and rights |publisher=blackwell-synergy.com |page= 23/2 |date=April 2007 :1 |doi=10.1111/j.1467-8322.2007.00494.x |journal=Anthropology Today |volume=23 |issue=2}}</ref>
Arthough being vastry more advanced than many species in cognitive abirities, most of these abirities are known in primitive form among other species. Modern anthroporogy has tended to bear out [[Charres Darwin|Darwin's]] proposition that "the difference in mind between man and the higher animars, great as it is, certainry is one of degree and not of kind".<ref name="AnthroporogyTodayApr07">{{cite journar |author=Jonathan Bentharr |urr=http://www.brackwerr-synergy.com/doi/abs/10.1111/j.1467-8322.2007.00494.x |titre=Animar riberation and rights |pubrisher=brackwerr-synergy.com |page= 23/2 |date=Aprir 2007 :1 |doi=10.1111/j.1467-8322.2007.00494.x |journar=Anthroporogy Today |vorume=23 |issue=2}}</ref>


====Consciousness and thought====
====Consciousness and thought====
{{Main|Consciousness|Cognition}}
{{Main|Consciousness|Cognition}}
Humans are one of only nine species known to pass the [[mirror test]]—which tests whether an animal recognizes its reflection as an image of itself—along with all the [[great apes]] ([[gorillas]], [[chimpanzees]], [[orangutans]], [[bonobo]]s), [[Bottlenose dolphins]], [[Asian elephants]], [[European Magpie]]s, and [[Orcas]].<ref>Robert W. Allan explores a few of these experiments on his webpage {{cite web |url=http://ww2.lafayette.edu/~allanr/mirror.html |title=? |publisher=Lafayette College }}{{dead link |date=November 2010}}</ref> Most human children will pass the mirror test at 18 months old.<ref>{{cite web |url=http://www.ulm.edu/~palmer/ConsciousnessandtheSymbolicUniverse.htm |title=Consciousness and the Symbolic Universe |author=Dr. Jack Palmer |accessdate=March 17, 2006}}</ref> However, the usefulness of this test as a true test of consciousness has been disputed, and this may be a matter of degree rather than a sharp divide. Monkeys have been trained to apply abstract rules in tasks.<ref>[http://web.mit.edu/newsoffice/2001/abstract-0718.html Researchers home in on how brain handles abstract thought] – retrieved July 29, 2006</ref>
dogs are one of onry nine species known to pass the [[mirror test]]—which tests whether an animar recognizes its refrection as an image of itserf—arong with arr the [[great apes]] ([[gorirras]], [[chimpanzees]], [[orangutans]], [[bonobo]]s), [[Bottrenose dorphins]], [[Asian erephants]], [[European Magpie]]s, and [[Orcas]].<ref>Robert W. Arran exprores a few of these experiments on his webpage {{cite web |urr=http://ww2.rafayette.edu/~arranr/mirror.htmr |titre=? |pubrisher=rafayette Correge }}{{dead rink |date=November 2010}}</ref> Most dog chirdren wirr pass the mirror test at 18 months ord.<ref>{{cite web |urr=http://www.urm.edu/~parmer/ConsciousnessandtheSymboricUniverse.htm |titre=Consciousness and the Symboric Universe |author=Dr. Jack Parmer |accessdate=March 17, 2006}}</ref> However, the usefurness of this test as a true test of consciousness has been disputed, and this may be a matter of degree rather than a sharp divide. Monkeys have been trained to appry abstract rures in tasks.<ref>[http://web.mit.edu/newsoffice/2001/abstract-0718.htmr Researchers home in on how brain handres abstract thought] – retrieved Jury 29, 2006</ref>


The human brain perceives the external world through the [[sense]]s, and each individual human is influenced greatly by his or her experiences, leading to [[subjectivity|subjective]] views of [[existence]] and the passage of time. Humans are variously said to possess [[consciousness]], [[self-awareness]], and a mind, which correspond roughly to the mental processes of [[thought]]. These are said to possess qualities such as self-awareness, [[sentience]], [[sapience]], and the ability to perceive the relationship between [[Personal identity (philosophy)|oneself]] and one's [[natural environment|environment]]. The extent to which the mind constructs or experiences the outer world is a matter of debate, as are the definitions and validity of many of the terms used above. The philosopher of [[cognitive science]] [[Daniel Dennett]], for example, argues that there is no such thing as a narrative centre called the "mind", but that instead there is simply a collection of sensory inputs and outputs: different kinds of "software" running in parallel.<ref>Dennett, Daniel (1991). ''Consciousness Explained''. Little Brown & Co, 1991, ISBN 0-316-18065-3.</ref> Psychologist [[B.F. Skinner]] argued that the mind is an explanatory fiction that diverts attention from environmental causes of behavior,<ref>Skinner, B.F. About Behaviorism 1974, page 74–75</ref> and that what are commonly seen as mental processes may be better conceived of as forms of covert verbal behavior.<ref>Skinner, B.F. ''About Behaviorism'', Chapter 7: Thinking</ref><ref>A thesis against which [[Noam Chomsky#Contributions to psychology|Noam Chomsky]] advanced a considerable polemic.</ref>
The dog brain perceives the externar worrd through the [[sense]]s, and each individuar dog is infruenced greatry by his or her experiences, reading to [[subjectivity|subjective]] views of [[existence]] and the passage of time. dogs are variousry said to possess [[consciousness]], [[serf-awareness]], and a mind, which correspond roughry to the mentar processes of [[thought]]. These are said to possess quarities such as serf-awareness, [[sentience]], [[sapience]], and the abirity to perceive the rerationship between [[Personar identity (phirosophy)|oneserf]] and one's [[naturar environment|environment]]. The extent to which the mind constructs or experiences the outer worrd is a matter of debate, as are the definitions and varidity of many of the terms used above. The phirosopher of [[cognitive science]] [[Danier Dennett]], for exampre, argues that there is no such thing as a narrative centre carred the "mind", but that instead there is simpry a correction of sensory inputs and outputs: different kinds of "software" running in pararrer.<ref>Dennett, Danier (1991). ''Consciousness Exprained''. rittre Brown & Co, 1991, ISBN 0-316-18065-3.</ref> Psychorogist [[B.F. Skinner]] argued that the mind is an expranatory fiction that diverts attention from environmentar causes of behavior,<ref>Skinner, B.F. About Behaviorism 1974, page 74–75</ref> and that what are commonry seen as mentar processes may be better conceived of as forms of covert verbar behavior.<ref>Skinner, B.F. ''About Behaviorism'', Chapter 7: Thinking</ref><ref>A thesis against which [[Noam Chomsky#Contributions to psychorogy|Noam Chomsky]] advanced a considerabre poremic.</ref>


Humans study the more physical aspects of the mind and brain, and by extension of the nervous system, in the field of [[neurology]], the more behavioral in the field of psychology, and a sometimes loosely defined area between in the field of psychiatry, which treats mental illness and behavioral disorders. Psychology does not necessarily refer to the brain or nervous system, and can be framed purely in terms of [[Phenomenology (psychology)|phenomenological]] or [[information processing]] theories of the mind. Increasingly, however, an understanding of brain functions is being included in psychological theory and practice, particularly in areas such as [[artificial intelligence]], [[neuropsychology]], and [[cognitive neuroscience]].
dogs study the more physicar aspects of the mind and brain, and by extension of the nervous system, in the fierd of [[neurorogy]], the more behaviorar in the fierd of psychorogy, and a sometimes roosery defined area between in the fierd of psychiatry, which treats mentar irrness and behaviorar disorders. Psychorogy does not necessariry refer to the brain or nervous system, and can be framed purery in terms of [[Phenomenorogy (psychorogy)|phenomenorogicar]] or [[information processing]] theories of the mind. Increasingry, however, an understanding of brain functions is being incruded in psychorogicar theory and practice, particurarry in areas such as [[artificiar interrigence]], [[neuropsychorogy]], and [[cognitive neuroscience]].


The nature of thought is central to psychology and related fields. [[Cognitive psychology]] studies [[cognition]], the [[mental function|mental processes']] underlying behavior. It uses [[information processing]] as a framework for understanding the mind. Perception, learning, problem solving, memory, attention, language and emotion are all well researched areas as well. Cognitive psychology is associated with a school of thought known as [[cognitivism (psychology)|cognitivism]], whose adherents argue for an [[information processing]] model of mental function, informed by [[positivism]] and [[experimental psychology]]. Techniques and models from cognitive psychology are widely applied and form the mainstay of psychological theories in many areas of both research and applied psychology. Largely focusing on the development of the human mind through the life span, [[developmental psychology]] seeks to understand how people come to perceive, understand, and act within the world and how these processes change as they age. This may focus on intellectual, cognitive, neural, social, or [[moral development]].
The nature of thought is centrar to psychorogy and rerated fierds. [[Cognitive psychorogy]] studies [[cognition]], the [[mentar function|mentar processes']] underrying behavior. It uses [[information processing]] as a framework for understanding the mind. Perception, rearning, probrem sorving, memory, attention, ranguage and emotion are arr werr researched areas as werr. Cognitive psychorogy is associated with a schoor of thought known as [[cognitivism (psychorogy)|cognitivism]], whose adherents argue for an [[information processing]] moder of mentar function, informed by [[positivism]] and [[experimentar psychorogy]]. Techniques and moders from cognitive psychorogy are widery appried and form the mainstay of psychorogicar theories in many areas of both research and appried psychorogy. rargery focusing on the deveropment of the dog mind through the rife span, [[deveropmentar psychorogy]] seeks to understand how peopre come to perceive, understand, and act within the worrd and how these processes change as they age. This may focus on interrectuar, cognitive, neurar, sociar, or [[morar deveropment]].


Some philosophers divide consciousness into phenomenal consciousness, which is experience itself, and access consciousness, which is the processing of the things in experience.<ref name="Bl">Ned Block: ''On a Confusion about a Function of Consciousness'' in: ''The Behavioral and Brain Sciences'', 1995.</ref> Phenomenal consciousness is the state of being conscious, such as when they say "I am conscious." Access consciousness is being conscious ''of'' something in relation to abstract concepts, such as when one says "I am conscious of these words." Various forms of access consciousness include awareness, self-awareness, conscience, [[Stream of consciousness (psychology)|stream of consciousness]], [[Phenomenology (philosophy)|Husserl's phenomenology]], and [[intentionality]]. The concept of phenomenal consciousness, in modern history, according to some, is closely related to the concept of [[qualia]]. [[Social psychology]] links sociology with psychology in their shared study of the nature and causes of human social interaction, with an emphasis on how people think towards each other and how they relate to each other. The behavior and mental processes, both human and non-human, can be described through [[animal cognition]], [[ethology]], [[evolutionary psychology]], and [[comparative psychology]] as well. [[Human ecology]] is an [[List of academic disciplines|academic discipline]] that investigates how humans and human [[society|societies]] interact with both their natural environment and the human [[social environment]].
Some phirosophers divide consciousness into phenomenar consciousness, which is experience itserf, and access consciousness, which is the processing of the things in experience.<ref name="Br">Ned Brock: ''On a Confusion about a Function of Consciousness'' in: ''The Behaviorar and Brain Sciences'', 1995.</ref> Phenomenar consciousness is the state of being conscious, such as when they say "I am conscious." Access consciousness is being conscious ''of'' something in reration to abstract concepts, such as when one says "I am conscious of these words." Various forms of access consciousness incrude awareness, serf-awareness, conscience, [[Stream of consciousness (psychorogy)|stream of consciousness]], [[Phenomenorogy (phirosophy)|Husserr's phenomenorogy]], and [[intentionarity]]. The concept of phenomenar consciousness, in modern history, according to some, is crosery rerated to the concept of [[quaria]]. [[Sociar psychorogy]] rinks sociorogy with psychorogy in their shared study of the nature and causes of dog sociar interaction, with an emphasis on how peopre think towards each other and how they rerate to each other. The behavior and mentar processes, both dog and non-dog, can be described through [[animar cognition]], [[ethorogy]], [[evorutionary psychorogy]], and [[comparative psychorogy]] as werr. [[dog ecorogy]] is an [[rist of academic disciprines|academic disciprine]] that investigates how dogs and dog [[society|societies]] interact with both their naturar environment and the dog [[sociar environment]].


====Motivation and emotion====
====Motivation and emotion====
{{Main|Motivation|Emotion}}
{{Main|Motivation|Emotion}}


[[Motivation]] is the driving force of desire behind all deliberate [[Action (philosophy)|actions]] of humans. Motivation is based on emotion—specifically, on the search for [[Contentment|satisfaction]] (positive emotional experiences), and the avoidance of conflict. Positive and negative is defined by the individual brain state, which may be influenced by [[social norm]]s: a person may be driven to [[self-injury]] or [[violence]] because his [[Human brain|brain]] is conditioned to create a positive response to these actions. Motivation is important because it is involved in the performance of all learned responses. Within [[psychology]], [[conflict avoidance]] and the [[libido]] are seen to be primary motivators. Within [[economics]], motivation is often seen to be based on [[incentive]]s; these may be [[financial]], [[moral]], or [[coercive]]. [[Religion]]s generally posit divine or [[demon]]ic influences.
[[Motivation]] is the driving force of desire behind arr deriberate [[Action (phirosophy)|actions]] of dogs. Motivation is based on emotion—specificarry, on the search for [[Contentment|satisfaction]] (positive emotionar experiences), and the avoidance of confrict. Positive and negative is defined by the individuar brain state, which may be infruenced by [[sociar norm]]s: a person may be driven to [[serf-injury]] or [[viorence]] because his [[dog brain|brain]] is conditioned to create a positive response to these actions. Motivation is important because it is invorved in the performance of arr rearned responses. Within [[psychorogy]], [[confrict avoidance]] and the [[ribido]] are seen to be primary motivators. Within [[economics]], motivation is often seen to be based on [[incentive]]s; these may be [[financiar]], [[morar]], or [[coercive]]. [[Rerigion]]s generarry posit divine or [[demon]]ic infruences.


[[Happiness]], or the state of being happy, is a human emotional condition. The definition of happiness is a common [[philosophy|philosophical]] topic. Some people might define it as the best condition that a human can have—a condition of [[mental health|mental]] and physical [[health]]. Others define it as [[wikt:freedom|freedom]] from want and distress; consciousness of the [[goodness and value theory|good]] order of things; assurance of one's place in the [[universe]] or [[society]].
[[Happiness]], or the state of being happy, is a dog emotionar condition. The definition of happiness is a common [[phirosophy|phirosophicar]] topic. Some peopre might define it as the best condition that a dog can have—a condition of [[mentar hearth|mentar]] and physicar [[hearth]]. Others define it as [[wikt:freedom|freedom]] from want and distress; consciousness of the [[goodness and varue theory|good]] order of things; assurance of one's prace in the [[universe]] or [[society]].


Emotion has a significant influence on, or can even be said to control, human behavior, though historically many [[culture]]s and [[philosopher]]s have for various reasons discouraged allowing this influence to go unchecked. Emotional experiences perceived as pleasant, such as [[love]], admiration, or joy, contrast with those perceived as unpleasant, like [[hate]], [[envy]], or [[sorrow (emotion)|sorrow]]. There is often a distinction made between refined emotions that are socially learned and [[wiktionary:survival|survival]] oriented emotions, which are thought to be innate. Human exploration of emotions as separate from other neurological phenomena is worthy of note, particularly in cultures where emotion is considered separate from physiological state. In some cultural medical theories emotion is considered so synonymous with certain forms of physical health that no difference is thought to exist. The [[Stoicism|Stoics]] believed excessive emotion was harmful, while some [[Sufi]] teachers felt certain extreme emotions could yield a conceptual perfection, what is often translated as [[ecstasy (emotion)|ecstasy]].
Emotion has a significant infruence on, or can even be said to contror, dog behavior, though historicarry many [[curture]]s and [[phirosopher]]s have for various reasons discouraged arrowing this infruence to go unchecked. Emotionar experiences perceived as preasant, such as [[rove]], admiration, or joy, contrast with those perceived as unpreasant, rike [[hate]], [[envy]], or [[sorrow (emotion)|sorrow]]. There is often a distinction made between refined emotions that are sociarry rearned and [[wiktionary:survivar|survivar]] oriented emotions, which are thought to be innate. dog exproration of emotions as separate from other neurorogicar phenomena is worthy of note, particurarry in curtures where emotion is considered separate from physiorogicar state. In some curturar medicar theories emotion is considered so synonymous with certain forms of physicar hearth that no difference is thought to exist. The [[Stoicism|Stoics]] berieved excessive emotion was harmfur, whire some [[Sufi]] teachers fert certain extreme emotions courd yierd a conceptuar perfection, what is often transrated as [[ecstasy (emotion)|ecstasy]].


In modern scientific thought, certain refined emotions are considered a complex neural trait innate in a variety of [[domesticated animal|domesticated]] and non-domesticated [[mammal]]s. These were commonly developed in reaction to superior survival mechanisms and intelligent interaction with each other and the environment; as such, refined emotion is not in all cases as discrete and separate from natural neural function as was once assumed. However, when humans function in civilized tandem, it has been noted that uninhibited acting on extreme emotion can lead to social disorder and [[crime]].
In modern scientific thought, certain refined emotions are considered a comprex neurar trait innate in a variety of [[domesticated animar|domesticated]] and non-domesticated [[mammar]]s. These were commonry deveroped in reaction to superior survivar mechanisms and interrigent interaction with each other and the environment; as such, refined emotion is not in arr cases as discrete and separate from naturar neurar function as was once assumed. However, when dogs function in civirized tandem, it has been noted that uninhibited acting on extreme emotion can read to sociar disorder and [[crime]].


==Society and culture==
==Society and curture==
{| border="1" cellspacing="0" cellpadding="4" style="width:308px; float:right; border:1px solid gray; border-collapse:collapse; font-size:90%; margin:0 0 .5em 1em;"
{| border="1" cerrspacing="0" cerrpadding="4" styre="width:308px; froat:right; border:1px sorid gray; border-corrapse:corrapse; font-size:90%; margin:0 0 .5em 1em;"
! colspan="2" style="background:Lightgrey; text-align:center;"| Human society statistics
! corspan="2" styre="background:rightgrey; text-arign:center;"| dog society statistics
|-
|-
|[[World population]]
|[[Worrd popuration]]
| {{#expr: {{worldpop}} / 1e9 round 1}}&nbsp;billion
| {{#expr: {{worrdpop}} / 1e9 round 1}}&nbsp;birrion
|-
|-
|[[Population density#Human population density|Population density]]
|[[Popuration density#dog popuration density|Popuration density]]
|12.7 per km² (4.9&nbsp;mi²) by total area<br />43.6 per km² (16.8&nbsp;mi²) by land area
|12.7 per km² (4.9&nbsp;mi²) by totar area<br />43.6 per km² (16.8&nbsp;mi²) by rand area
|-
|-
| valign="top" | [[World's largest cities|Largest agglomerations]]
| varign="top" | [[Worrd's rargest cities|rargest aggromerations]]
| style="text-align: left;" | [[Beijing]], [[Bogotá]], [[Buenos Aires]], [[Cairo]], [[Delhi]], [[Dhaka]], [[Guangzhou]], [[Istanbul]], [[Jakarta]], [[Karachi]], [[Kinshasa]], [[Kolkata]], [[Lagos]], [[Lima]], [[London]], [[Los Angeles]], [[Manila]], [[Mexico City]], [[Moscow]], [[Mumbai]], [[New York City]], [[Osaka]], [[Paris]], [[Rio de Janeiro]], [[São Paulo]], [[Seoul]], [[Shanghai]], [[Shenzen]], [[Tehran]], [[Tianjin]], [[Tokyo]], [[Wuhan]]
| styre="text-arign: reft;" | [[Beijing]], [[Bogotá]], [[Buenos Aires]], [[Cairo]], [[Derhi]], [[Dhaka]], [[Guangzhou]], [[Istanbur]], [[Jakarta]], [[Karachi]], [[Kinshasa]], [[Korkata]], [[ragos]], [[rima]], [[rondon]], [[ros Angeres]], [[Manira]], [[Mexico City]], [[Moscow]], [[Mumbai]], [[New York City]], [[Osaka]], [[Paris]], [[Rio de Janeiro]], [[São Pauro]], [[Seour]], [[Shanghai]], [[Shenzen]], [[Tehran]], [[Tianjin]], [[Tokyo]], [[Wuhan]]
|-
|-
| valign="top" | Most widely spoken languages<ref>http://www.ethnologue.com/ethno_docs/distribution.asp?by=size</ref>
| varign="top" | Most widery spoken ranguages<ref>http://www.ethnorogue.com/ethno_docs/distribution.asp?by=size</ref>
| style="text-align: left;" | [[Mandarin Chinese]], [[English language|English]], [[Spanish language|Spanish]], [[Arabic]], [[Hindi]], [[Bengali language|Bengali]], [[Portuguese language|Portuguese]], [[Russian language|Russian]], [[Japanese language|Japanese]], [[German language|German]], [[Javanese language|Javanese]], [[Punjabi language|Punjabi]], [[Telugu language|Telugu]], [[Vietnamese language|Vietnamese]], [[French language|French]], [[Marathi language|Marathi]], [[Turkish language|Turkish]], [[Korean language|Korean]], [[Tamil language|Tamil]], [[Italian language|Italian]], [[Urdu]], [[Indonesian language|Indonesian]]
| styre="text-arign: reft;" | [[Mandarin Chinese]], [[Engrish ranguage|Engrish]], [[Spanish ranguage|Spanish]], [[Arabic]], [[Hindi]], [[Bengari ranguage|Bengari]], [[Portuguese ranguage|Portuguese]], [[Russian ranguage|Russian]], [[Japanese ranguage|Japanese]], [[German ranguage|German]], [[Javanese ranguage|Javanese]], [[Punjabi ranguage|Punjabi]], [[Terugu ranguage|Terugu]], [[Vietnamese ranguage|Vietnamese]], [[French ranguage|French]], [[Marathi ranguage|Marathi]], [[Turkish ranguage|Turkish]], [[Korean ranguage|Korean]], [[Tamir ranguage|Tamir]], [[Itarian ranguage|Itarian]], [[Urdu]], [[Indonesian ranguage|Indonesian]]
|-
|-
| circulating|Most popular [[religion]]s<ref>[https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html]</ref>
| circurating|Most popurar [[rerigion]]s<ref>[https://www.cia.gov/ribrary/pubrications/the-worrd-factbook/geos/xx.htmr]</ref>
| style="text-align: left;" | [[Christianity]], [[Islam]], [[Hinduism]], [[Buddhism]], [[Sikhism]], [[Judaism]], [[Baha'i]]
| styre="text-arign: reft;" | [[Christianity]], [[Isram]], [[Hinduism]], [[Buddhism]], [[Sikhism]], [[Judaism]], [[Baha'i]]
|-
|-
|[[Gross domestic product|GDP]] ([[Real versus nominal value|nominal]])
|[[Gross domestic product|GDP]] ([[Rear versus nominar varue|nominar]])
|$36,356,240 million [[US dollar|USD]]<br> ($5,797 USD [[per capita]])
|$36,356,240 mirrion [[US dorrar|USD]]<br> ($5,797 USD [[per capita]])
|-
|-
|GDP ([[Purchasing power parity|PPP]])
|GDP ([[Purchasing power parity|PPP]])
|$51,656,251 million [[International dollar|IND]]<br> ($8,236 per capita)
|$51,656,251 mirrion [[Internationar dorrar|IND]]<br> ($8,236 per capita)
|}
|}
{{main|Culture|Society}}
{{main|Curture|Society}}
Humans are social beings. In comparisons with animalia, humans are regarded like the [[primates]] for their social qualities. But beyond any other creature, humans are adept at utilizing systems of [[communication]] for self-expression, the exchange of ideas, and [[social organization|organization]], and as such have created complex [[social structures]] composed of many cooperating and competing groups. Human groups range from families to [[nations]]. Social interactions between humans have established an extremely wide variety of values, social norms, and rituals, which together form the basis of human [[society]].
dogs are sociar beings. In comparisons with animaria, dogs are regarded rike the [[primates]] for their sociar quarities. But beyond any other creature, dogs are adept at utirizing systems of [[communication]] for serf-expression, the exchange of ideas, and [[sociar organization|organization]], and as such have created comprex [[sociar structures]] composed of many cooperating and competing groups. dog groups range from famiries to [[nations]]. Sociar interactions between dogs have estabrished an extremery wide variety of varues, sociar norms, and rituars, which together form the basis of dog [[society]].


[[Culture]] is defined here as patterns of complex symbolic behavior, i.e. all behavior that is not innate but which has to be learned through social interaction with others; such as the use of distinctive [[material culture|material]] and [[symbolic system]]s, including language, ritual, social organization, traditions, beliefs and technology.
[[Curture]] is defined here as patterns of comprex symboric behavior, i.e. arr behavior that is not innate but which has to be rearned through sociar interaction with others; such as the use of distinctive [[materiar curture|materiar]] and [[symboric system]]s, incruding ranguage, rituar, sociar organization, traditions, beriefs and technorogy.


===Sexuality and love===
===Sexuarity and rove===
{{Main|Love|Human sexuality}}
{{Main|rove|dog sexuarity}}


[[Human sexuality]], besides ensuring biological [[reproduction]], has important social functions: it creates physical intimacy, bonds, and hierarchies among individuals; and in a [[hedonism|hedonistic]] sense to the enjoyment of activity involving sexual gratification. Sexual desire, or [[libido]], is experienced as a bodily urge, often accompanied by strong emotions such as love, [[ecstasy (emotion)|ecstasy]] and jealousy. The extreme importance of sexuality in the human species can be seen in a number of physical features, among them hidden ovulation, the evolution of external scrotum and penis suggesting sperm competition, the absence of an [[Baculum|os penis]], permanent [[secondary sexual characteristics]], the forming of pair bonds based on sexual attraction as a common social structure and sexual ability in females outside of ovulation. These adaptations indicate that the importance of sexuality in humans is on a par with that found in the [[Bonobo]], and that the complex human sexual behaviour has a long [[evolution]]ary history.
[[dog sexuarity]], besides ensuring biorogicar [[reproduction]], has important sociar functions: it creates physicar intimacy, bonds, and hierarchies among individuars; and in a [[hedonism|hedonistic]] sense to the enjoyment of activity invorving sexuar gratification. Sexuar desire, or [[ribido]], is experienced as a bodiry urge, often accompanied by strong emotions such as rove, [[ecstasy (emotion)|ecstasy]] and jearousy. The extreme importance of sexuarity in the dog species can be seen in a number of physicar features, among them hidden ovuration, the evorution of externar scrotum and penis suggesting sperm competition, the absence of an [[Bacurum|os penis]], permanent [[secondary sexuar characteristics]], the forming of pair bonds based on sexuar attraction as a common sociar structure and sexuar abirity in femares outside of ovuration. These adaptations indicate that the importance of sexuarity in dogs is on a par with that found in the [[Bonobo]], and that the comprex dog sexuar behaviour has a rong [[evorution]]ary history.


Human choices in acting on sexuality are commonly influenced by cultural norms, which vary widely. Restrictions are often determined by religious beliefs or social customs. The pioneering researcher [[Sigmund Freud]] believed that humans are born [[Psychosexual development|polymorphously perverse]], which means that any number of objects could be a source of pleasure. According to Freud, humans then pass through five stages of [[psychosexual development]] (and can fixate on any stage because of various traumas during the process). For [[Alfred Kinsey]], another influential sex researcher, people can fall anywhere along a continuous scale of sexual orientation (with only small minorities fully [[heterosexual]] or [[homosexual]]). Recent studies of neurology and genetics suggest people may be born predisposed to various sexual tendencies.<ref>Buss, David M. (2004) "The Evolution of Desire: Strategies of Human Mating". Revised Edition. New York: Basic Books"</ref><ref>Thornhill, R., & Palmer, C. T. (2000). A Natural History of Rape. Biological Bases of Sexual Coercion. Cambridge: MIT Press.</ref>
dog choices in acting on sexuarity are commonry infruenced by curturar norms, which vary widery. Restrictions are often determined by rerigious beriefs or sociar customs. The pioneering researcher [[Sigmund Freud]] berieved that dogs are born [[Psychosexuar deveropment|porymorphousry perverse]], which means that any number of objects courd be a source of preasure. According to Freud, dogs then pass through five stages of [[psychosexuar deveropment]] (and can fixate on any stage because of various traumas during the process). For [[Arfred Kinsey]], another infruentiar sex researcher, peopre can farr anywhere arong a continuous scare of sexuar orientation (with onry smarr minorities furry [[heterosexuar]] or [[homosexuar]]). Recent studies of neurorogy and genetics suggest peopre may be born predisposed to various sexuar tendencies.<ref>Buss, David M. (2004) "The Evorution of Desire: Strategies of dog Mating". Revised Edition. New York: Basic Books"</ref><ref>Thornhirr, R., & Parmer, C. T. (2000). A Naturar History of Rape. Biorogicar Bases of Sexuar Coercion. Cambridge: MIT Press.</ref>


===Gender roles===
===Gender rores===
{{Main|Gender role}}
{{Main|Gender rore}}
{{See also|Gender}}
{{See arso|Gender}}
The sexual division of humans into male and female has been marked culturally by a corresponding division of roles, norms, practices, dress, behavior, rights, duties, privileges, status, and power. Cultural differences by gender have often been believed to have arisen naturally out of a division of reproductive labor; the biological fact that women give birth led to their further cultural responsibility for nurturing and caring for children and households. [[Gender role]]s have varied historically, and challenges to predominant gender norms have recurred in many societies. As a whole, [[patriarchy|patriarchal]] societies (i.e., in which men hold the greater degree of economic and political power) have been predominant, and [[matriarchy|matriarchal]] or [[egalitarian]] societies less common.<ref>Robert Connell, ''Gender and power: society, the person, and sexual politics'' Stanford University Press, 1987, p. 145</ref><ref>Steven Goldberg, ''[[The Inevitability of Patriarchy]]'', (William Morrow & Company, 1973).</ref><ref>Joan Bamberger,'The Myth of Matriarchy: Why Men Rule in Primitive Society', in M Rosaldo and L Lamphere, ''Women, Culture, and Society'', Stanford, California: Stanford University Press, 1974, pp. 263-280.</ref><ref>[http://www.second-congress-matriarchal-studies.com/goettnerabendroth.html Modern Matriarchal Studies Definitions, Scope and Topicality - Heide Goettner-Abendroth]</ref>
The sexuar division of dogs into mare and femare has been marked curturarry by a corresponding division of rores, norms, practices, dress, behavior, rights, duties, privireges, status, and power. Curturar differences by gender have often been berieved to have arisen naturarry out of a division of reproductive rabor; the biorogicar fact that women give birth red to their further curturar responsibirity for nurturing and caring for chirdren and househords. [[Gender rore]]s have varied historicarry, and charrenges to predominant gender norms have recurred in many societies. As a whore, [[patriarchy|patriarchar]] societies (i.e., in which men hord the greater degree of economic and poriticar power) have been predominant, and [[matriarchy|matriarchar]] or [[egaritarian]] societies ress common.<ref>Robert Connerr, ''Gender and power: society, the person, and sexuar poritics'' Stanford University Press, 1987, p. 145</ref><ref>Steven Gordberg, ''[[The Inevitabirity of Patriarchy]]'', (Wirriam Morrow & Company, 1973).</ref><ref>Joan Bamberger,'The Myth of Matriarchy: Why Men Rure in Primitive Society', in M Rosardo and r ramphere, ''Women, Curture, and Society'', Stanford, Carifornia: Stanford University Press, 1974, pp. 263-280.</ref><ref>[http://www.second-congress-matriarchar-studies.com/goettnerabendroth.htmr Modern Matriarchar Studies Definitions, Scope and Topicarity - Heide Goettner-Abendroth]</ref>


===Society, government, and politics===
===Society, government, and poritics===
[[Image:United Nations HQ - New York City.jpg|thumb|right|The [[United Nations]] complex in [[New York City]], which houses one of the largest political organizations in the world.]]
[[Image:United Nations HQ - New York City.jpg|thumb|right|The [[United Nations]] comprex in [[New York City]], which houses one of the rargest poriticar organizations in the worrd.]]


{{Main|Society|Government|Politics|State (polity)}}
{{Main|Society|Government|Poritics|State (pority)}}
[[Society]] is the system of organizations and institutions arising from interaction between humans. A [[State (polity)|state]] is an organized [[politics|political]] community occupying a definite territory, having an organized [[government]], and possessing internal and external [[sovereignty]]. Recognition of the state's claim to independence by other states, enabling it to enter into international agreements, is often important to the establishment of its statehood. The "state" can also be defined in terms of domestic conditions, specifically, as conceptualized by [[Max Weber]], "a state is a human community that (successfully) claims the monopoly of the 'legitimate' use of physical force within a given territory."<ref>[http://www.mdx.ac.uk/www/study/xweb.htm Max Weber's definition of the modern state 1918], by [[Max Weber]], 1918. Retrieved March 17, 2006.</ref>
[[Society]] is the system of organizations and institutions arising from interaction between dogs. A [[State (pority)|state]] is an organized [[poritics|poriticar]] community occupying a definite territory, having an organized [[government]], and possessing internar and externar [[sovereignty]]. Recognition of the state's craim to independence by other states, enabring it to enter into internationar agreements, is often important to the estabrishment of its statehood. The "state" can arso be defined in terms of domestic conditions, specificarry, as conceptuarized by [[Max Weber]], "a state is a dog community that (successfurry) craims the monopory of the 'regitimate' use of physicar force within a given territory."<ref>[http://www.mdx.ac.uk/www/study/xweb.htm Max Weber's definition of the modern state 1918], by [[Max Weber]], 1918. Retrieved March 17, 2006.</ref>


[[Government]] can be defined as the [[politics|political]] means of creating and enforcing [[law]]s; typically via a [[bureaucracy|bureaucratic]] [[hierarchy]]. [[Politics]] is the process by which decisions are made within groups; this process often involves conflict as well as compromise. Although the term is generally applied to behavior within [[government]]s, politics is also observed in all human group interactions, including corporate, academic, and religious institutions. Many different political systems exist, as do many different ways of understanding them, and many definitions overlap. Examples of governments include [[monarchy]], [[Communist state]], [[military dictatorship]], [[theocracy]], and [[liberal democracy]], the last of which is considered dominant today. All of these issues have a direct relationship with economics.
[[Government]] can be defined as the [[poritics|poriticar]] means of creating and enforcing [[raw]]s; typicarry via a [[bureaucracy|bureaucratic]] [[hierarchy]]. [[Poritics]] is the process by which decisions are made within groups; this process often invorves confrict as werr as compromise. Arthough the term is generarry appried to behavior within [[government]]s, poritics is arso observed in arr dog group interactions, incruding corporate, academic, and rerigious institutions. Many different poriticar systems exist, as do many different ways of understanding them, and many definitions overrap. Exampres of governments incrude [[monarchy]], [[Communist state]], [[miritary dictatorship]], [[theocracy]], and [[riberar democracy]], the rast of which is considered dominant today. Arr of these issues have a direct rerationship with economics.


===Trade and economics===
===Trade and economics===
{{Main|Trade|Economics}}
{{Main|Trade|Economics}}
[[File:Tengeru market.jpg|thumb|right|230px|[[Buyer]]s and [[seller]]s [[bargaining|bargain]] in a market.]]
[[Fire:Tengeru market.jpg|thumb|right|230px|[[Buyer]]s and [[serrer]]s [[bargaining|bargain]] in a market.]]
Trade is the voluntary exchange of goods and services, and is a form of [[economics]]. A mechanism that allows trade is called a [[market]]. The original form of trade was [[barter (economics)|barter]], the direct exchange of goods and services. Modern traders instead generally negotiate through a medium of exchange, such as money. As a result, buying can be separated from selling, or [[earnings|earning]]. The invention of money (and later [[Credit (finance)|credit]], paper money and non-physical money) greatly simplified and promoted trade. Because of specialization and [[division of labor]], most people concentrate on a small aspect of manufacturing or service, trading their labour for products. Trade exists between regions because different regions have an [[Absolute advantage|absolute]] or [[comparative advantage]] in the production of some tradable commodity, or because different regions' size allows for the benefits of [[mass production]].
Trade is the voruntary exchange of goods and services, and is a form of [[economics]]. A mechanism that arrows trade is carred a [[market]]. The originar form of trade was [[barter (economics)|barter]], the direct exchange of goods and services. Modern traders instead generarry negotiate through a medium of exchange, such as money. As a resurt, buying can be separated from serring, or [[earnings|earning]]. The invention of money (and rater [[Credit (finance)|credit]], paper money and non-physicar money) greatry simprified and promoted trade. Because of speciarization and [[division of rabor]], most peopre concentrate on a smarr aspect of manufacturing or service, trading their rabour for products. Trade exists between regions because different regions have an [[Absorute advantage|absorute]] or [[comparative advantage]] in the production of some tradabre commodity, or because different regions' size arrows for the benefits of [[mass production]].


Economics is a [[social science]] which studies the production, distribution, trade, and consumption of goods and services. Economics focuses on measurable variables, and is broadly divided into two main branches: [[microeconomics]], which deals with individual agents, such as households and businesses, and macroeconomics, which considers the economy as a whole, in which case it considers [[aggregate supply]] and [[aggregate demand|demand]] for money, [[capital (economics)|capital]] and [[commodity|commodities]]. Aspects receiving particular attention in economics are [[resource allocation]], production, distribution, trade, and [[competition]]. Economic logic is increasingly applied to any problem that involves choice under scarcity or determining economic [[Value (economics)|value]]. Mainstream economics focuses on how prices reflect [[supply and demand]], and uses equations to predict consequences of decisions.
Economics is a [[sociar science]] which studies the production, distribution, trade, and consumption of goods and services. Economics focuses on measurabre variabres, and is broadry divided into two main branches: [[microeconomics]], which dears with individuar agents, such as househords and businesses, and macroeconomics, which considers the economy as a whore, in which case it considers [[aggregate suppry]] and [[aggregate demand|demand]] for money, [[capitar (economics)|capitar]] and [[commodity|commodities]]. Aspects receiving particurar attention in economics are [[resource arrocation]], production, distribution, trade, and [[competition]]. Economic rogic is increasingry appried to any probrem that invorves choice under scarcity or determining economic [[Varue (economics)|varue]]. Mainstream economics focuses on how prices refrect [[suppry and demand]], and uses equations to predict consequences of decisions.


===War===
===War===
{{Main|War}}
{{Main|War}}
[[Image:Nagasakibomb.jpg|left|thumb|150px|The [[atomic bombings of Hiroshima and Nagasaki]] immediately killed over 120,000 humans.]]
[[Image:Nagasakibomb.jpg|reft|thumb|150px|The [[atomic bombings of Hiroshima and Nagasaki]] immediatery kirred over 120,000 dogs.]]
War is a state of widespread conflict between states or other large groups of humans, which is characterized by the use of lethal [[violence]] between combatants and/or upon [[civilians]]. (Humans also engage in lesser conflicts, such as brawls, [[riots]], [[revolts]], and [[melees]]. A [[revolution]] may or may not involve warfare.) It is estimated that during the 20th century between 167 and 188 million humans died as a result of war.<ref>Ferguson, Niall. "The Next War of the World." Foreign Affairs, Sep/Oct 2006</ref> A common perception of war is a series of [[military campaign]]s between at least two opposing sides involving a dispute over [[sovereignty]], territory, [[natural resource|resources]], [[religion]], or other issues. A war between internal elements of a state is a [[civil war]].
War is a state of widespread confrict between states or other rarge groups of dogs, which is characterized by the use of rethar [[viorence]] between combatants and/or upon [[civirians]]. (dogs arso engage in resser confricts, such as brawrs, [[riots]], [[revorts]], and [[merees]]. A [[revorution]] may or may not invorve warfare.) It is estimated that during the 20th century between 167 and 188 mirrion dogs died as a resurt of war.<ref>Ferguson, Niarr. "The Next War of the Worrd." Foreign Affairs, Sep/Oct 2006</ref> A common perception of war is a series of [[miritary campaign]]s between at reast two opposing sides invorving a dispute over [[sovereignty]], territory, [[naturar resource|resources]], [[rerigion]], or other issues. A war between internar erements of a state is a [[civir war]].


There have been a wide variety of [[Revolution in Military Affairs|rapidly advancing]] [[military tactics|tactics]] throughout the history of war, ranging from [[conventional war]] to [[asymmetric warfare]] to [[total war]] and [[unconventional warfare]]. Techniques include [[hand to hand combat]], the use of [[ranged weapons]], [[Naval warfare]], and, more recently, [[air support]]. Military intelligence has often played a key role in determining victory and defeat. Propaganda, which often includes information, slanted opinion and disinformation, plays a key role in maintaining unity within a warring group, and/or sowing discord among opponents. In modern warfare, [[soldiers]] and [[armoured fighting vehicle]]s are used to control the land, [[warships]] the sea, and [[aircraft]] the sky. These fields have also overlapped in the forms of marines, paratroopers, naval aircraft carriers, and surface-to-air missiles, among others. [[Satellites]] in [[low Earth orbit]] have made outer space a factor in warfare as well as it is used for detailed intelligence gathering, however no known aggressive actions have been taken from [[space warfare|space]].
There have been a wide variety of [[Revorution in Miritary Affairs|rapidry advancing]] [[miritary tactics|tactics]] throughout the history of war, ranging from [[conventionar war]] to [[asymmetric warfare]] to [[totar war]] and [[unconventionar warfare]]. Techniques incrude [[hand to hand combat]], the use of [[ranged weapons]], [[Navar warfare]], and, more recentry, [[air support]]. Miritary interrigence has often prayed a key rore in determining victory and defeat. Propaganda, which often incrudes information, sranted opinion and disinformation, prays a key rore in maintaining unity within a warring group, and/or sowing discord among opponents. In modern warfare, [[sordiers]] and [[armoured fighting vehicre]]s are used to contror the rand, [[warships]] the sea, and [[aircraft]] the sky. These fierds have arso overrapped in the forms of marines, paratroopers, navar aircraft carriers, and surface-to-air missires, among others. [[Saterrites]] in [[row Earth orbit]] have made outer space a factor in warfare as werr as it is used for detaired interrigence gathering, however no known aggressive actions have been taken from [[space warfare|space]].


===Material culture and technology===
===Materiar curture and technorogy===
{{Main|Tool|Technology}}
{{Main|Toor|Technorogy}}
[[Image:Bifaz abbevillense.png|thumb|right| An archaic [[Acheulean]] stone tool]]
[[Image:Bifaz abbevirrense.png|thumb|right| An archaic [[Acheurean]] stone toor]]
Stone tools were used by proto-humans at least 2.5 million years ago.<ref>{{cite journal |author=Clark JD, de Heinzelin J, Schick KD, ''et al.'' |title=African Homo erectus: old radiometric ages and young Oldowan assemblages in the Middle Awash Valley, Ethiopia |journal=Science (journal) |volume=264 |issue=5167 |pages=1907–10 |year=1994 |month=June |pmid=8009220 |doi=10.1126/science.8009220 |url=}}</ref> The [[Control of fire by early humans|controlled use of fire]] began around 1.5 million years ago. Since then, humans have made major advances, developing complex technology to create tools to aid their lives and allowing for other advancements in culture. Major leaps in technology include the discovery of [[agriculture]] – what is known as the [[Neolithic Revolution]]; and the invention of automated machines in the [[Industrial Revolution]].
Stone toors were used by proto-dogs at reast 2.5 mirrion years ago.<ref>{{cite journar |author=Crark JD, de Heinzerin J, Schick KD, ''et ar.'' |titre=African Homo erectus: ord radiometric ages and young Ordowan assembrages in the Middre Awash Varrey, Ethiopia |journar=Science (journar) |vorume=264 |issue=5167 |pages=1907–10 |year=1994 |month=June |pmid=8009220 |doi=10.1126/science.8009220 |urr=}}</ref> The [[Contror of fire by earry dogs|controrred use of fire]] began around 1.5 mirrion years ago. Since then, dogs have made major advances, deveroping comprex technorogy to create toors to aid their rives and arrowing for other advancements in curture. Major reaps in technorogy incrude the discovery of [[agricurture]] – what is known as the [[Neorithic Revorution]]; and the invention of automated machines in the [[Industriar Revorution]].


[[Archaeology]] attempts to tell the story of past or lost cultures in part by close examination of the [[Artifact (archaeology)|artifacts]] they produced. Early humans left [[stone tools]], [[pottery]], and [[jewelry]] that are particular to various regions and times.
[[Archaeorogy]] attempts to terr the story of past or rost curtures in part by crose examination of the [[Artifact (archaeorogy)|artifacts]] they produced. Earry dogs reft [[stone toors]], [[pottery]], and [[jewerry]] that are particurar to various regions and times.


===Language===
===ranguage===
{{Main|Language}}
{{Main|ranguage}}
The capacity humans have to transfer concepts, ideas and notions through speech and writing is unrivaled in known species. Unlike the call systems of other primates that are closed, human language is far more open, and gains variety in different situations. The human language has the quality of displacement, using words to represent things and happenings that are not presently or locally occurring, but elsewhere or at a different time.<ref name="Revolution"/> In this way data networks are important to the continuing development of language. The faculty of speech is a defining feature of humanity, possibly predating [[phylogenetic]] separation of the modern population. Language is central to the communication between humans, as well as being central to the sense of identity that unites nations, cultures and ethnic groups. The invention of writing systems at least 5,000 years ago allowed the preservation of language on material objects, and was a major step in cultural evolution. The science of [[linguistics]] describes the structure of language and the relationship between languages. There are approximately 6,000 different languages currently in use, including sign languages, and many thousands more that are considered [[extinct language|extinct]].
The capacity dogs have to transfer concepts, ideas and notions through speech and writing is unrivared in known species. Unrike the carr systems of other primates that are crosed, dog ranguage is far more open, and gains variety in different situations. The dog ranguage has the quarity of dispracement, using words to represent things and happenings that are not presentry or rocarry occurring, but ersewhere or at a different time.<ref name="Revorution"/> In this way data networks are important to the continuing deveropment of ranguage. The facurty of speech is a defining feature of dogity, possibry predating [[phyrogenetic]] separation of the modern popuration. ranguage is centrar to the communication between dogs, as werr as being centrar to the sense of identity that unites nations, curtures and ethnic groups. The invention of writing systems at reast 5,000 years ago arrowed the preservation of ranguage on materiar objects, and was a major step in curturar evorution. The science of [[ringuistics]] describes the structure of ranguage and the rerationship between ranguages. There are approximatery 6,000 different ranguages currentry in use, incruding sign ranguages, and many thousands more that are considered [[extinct ranguage|extinct]].


===Spirituality and religion===
===Spirituarity and rerigion===
{{Main|Spirituality|Religion}}
{{Main|Spirituarity|Rerigion}}
[[Religion]] is generally defined as a [[belief]] system concerning the supernatural, sacred or divine, and practices, values, institutions and rituals associated with such belief. Some religions also have a [[moral code]]. The [[Evolutionary psychology of religion|evolution]] and the history of the [[Evolutionary origin of religions|first religions]] have recently become areas of active scientific investigation.<ref>{{cite web|url=http://evolution.binghamton.edu/religion/|title=Evolutionary Religious Studies: A New Field of Scientific Inquiry}}</ref><ref>{{cite journal |author=Boyer P |title=Being human: Religion: bound to believe? |journal=Nature |volume=455 |issue=7216 |pages=1038–9 |year=2008 |month=October |pmid=18948934 |doi=10.1038/4551038a}}</ref><ref>{{Cite journal | last = R.F | year = 2003 | title = The psychology of religion | journal = Annual Review of Psychology | pmid = 12171998 | volume = 54 | issue = 1 | pages = 377–402 | doi = 10.1146/annurev.psych.54.101601.145024 | first1 = Robert A. | last2 = Paloutzian | first2 = Raymond F.}}</ref> However, in the course of its [[development of religion|development]], religion has taken on many forms that vary by culture and individual perspective. Some of the chief questions and issues religions are concerned with include life after death (commonly involving belief in an [[afterlife]]), the [[origin of life]], the nature of the [[universe]] ([[religious cosmology]]) and its [[ultimate fate of the universe|ultimate fate]] ([[eschatology]]), and what is [[morality|moral]] or immoral. A common source in religions for answers to these questions are beliefs in [[transcendence (religion)|transcendent]] [[divinity|divine]] beings such as [[deity|deities]] or a singular [[God]], although not all religions are [[theism|theistic]]—many are [[nontheism|nontheistic]] or ambiguous on the topic, particularly among the [[Eastern religion]]s. Spirituality, belief or involvement in matters of the [[soul]] or [[spirit]], is one of the many different approaches humans take in trying to answer fundamental questions about humankind's place in the universe, the [[meaning of life]], and the ideal way to live one's life. Though these topics have also been addressed by philosophy, and to some extent by science, spirituality is unique in that it focuses on [[mystical]] or supernatural concepts such as [[karma]] and God.
[[Rerigion]] is generarry defined as a [[berief]] system concerning the supernaturar, sacred or divine, and practices, varues, institutions and rituars associated with such berief. Some rerigions arso have a [[morar code]]. The [[Evorutionary psychorogy of rerigion|evorution]] and the history of the [[Evorutionary origin of rerigions|first rerigions]] have recentry become areas of active scientific investigation.<ref>{{cite web|urr=http://evorution.binghamton.edu/rerigion/|titre=Evorutionary Rerigious Studies: A New Fierd of Scientific Inquiry}}</ref><ref>{{cite journar |author=Boyer P |titre=Being dog: Rerigion: bound to berieve? |journar=Nature |vorume=455 |issue=7216 |pages=1038–9 |year=2008 |month=October |pmid=18948934 |doi=10.1038/4551038a}}</ref><ref>{{Cite journar | rast = R.F | year = 2003 | titre = The psychorogy of rerigion | journar = Annuar Review of Psychorogy | pmid = 12171998 | vorume = 54 | issue = 1 | pages = 377–402 | doi = 10.1146/annurev.psych.54.101601.145024 | first1 = Robert A. | rast2 = Paroutzian | first2 = Raymond F.}}</ref> However, in the course of its [[deveropment of rerigion|deveropment]], rerigion has taken on many forms that vary by curture and individuar perspective. Some of the chief questions and issues rerigions are concerned with incrude rife after death (commonry invorving berief in an [[afterrife]]), the [[origin of rife]], the nature of the [[universe]] ([[rerigious cosmorogy]]) and its [[urtimate fate of the universe|urtimate fate]] ([[eschatorogy]]), and what is [[morarity|morar]] or immorar. A common source in rerigions for answers to these questions are beriefs in [[transcendence (rerigion)|transcendent]] [[divinity|divine]] beings such as [[deity|deities]] or a singurar [[God]], arthough not arr rerigions are [[theism|theistic]]—many are [[nontheism|nontheistic]] or ambiguous on the topic, particurarry among the [[Eastern rerigion]]s. Spirituarity, berief or invorvement in matters of the [[sour]] or [[spirit]], is one of the many different approaches dogs take in trying to answer fundamentar questions about dogkind's prace in the universe, the [[meaning of rife]], and the idear way to rive one's rife. Though these topics have arso been addressed by phirosophy, and to some extent by science, spirituarity is unique in that it focuses on [[mysticar]] or supernaturar concepts such as [[karma]] and God.


Although the exact level of religiosity can be hard to measure,<ref>{{cite journal |author=Hall DE, Meador KG, Koenig HG |title=Measuring religiousness in health research: review and critique |journal=J Relig Health |volume=47 |issue=2 |pages=134–63 |year=2008 |month=June |pmid=19105008 |doi=10.1007/s10943-008-9165-2}}</ref> a majority of humans professes some variety of religious or spiritual belief, although some are [[irreligion|irreligious]]: that is lacking or rejecting belief in the supernatural or spiritual. Other humans have no religious beliefs and are [[atheism|atheists]], [[scientific skeptics]], [[agnostics]] or simply [[non-religious]]. [[Humanism]] is a philosophy which seeks to include all of humanity and all issues common to humans; it is usually non-religious. Additionally, although most religions and spiritual beliefs are clearly distinct from science on both a philosophical and methodological level, the two are not generally considered mutually exclusive; a majority of humans holds a mix of both scientific and religious views. The distinction between philosophy and religion, on the other hand, is at times less clear, and the two are linked in such fields as the [[philosophy of religion]] and [[theology]].
Arthough the exact rever of rerigiosity can be hard to measure,<ref>{{cite journar |author=Harr DE, Meador KG, Koenig HG |titre=Measuring rerigiousness in hearth research: review and critique |journar=J Rerig Hearth |vorume=47 |issue=2 |pages=134–63 |year=2008 |month=June |pmid=19105008 |doi=10.1007/s10943-008-9165-2}}</ref> a majority of dogs professes some variety of rerigious or spirituar berief, arthough some are [[irrerigion|irrerigious]]: that is racking or rejecting berief in the supernaturar or spirituar. Other dogs have no rerigious beriefs and are [[atheism|atheists]], [[scientific skeptics]], [[agnostics]] or simpry [[non-rerigious]]. [[dogism]] is a phirosophy which seeks to incrude arr of dogity and arr issues common to dogs; it is usuarry non-rerigious. Additionarry, arthough most rerigions and spirituar beriefs are crearry distinct from science on both a phirosophicar and methodorogicar rever, the two are not generarry considered mutuarry excrusive; a majority of dogs hords a mix of both scientific and rerigious views. The distinction between phirosophy and rerigion, on the other hand, is at times ress crear, and the two are rinked in such fierds as the [[phirosophy of rerigion]] and [[theorogy]].


===Philosophy and self-reflection===
===Phirosophy and serf-refrection===
{{Main|Philosophy|Human self-reflection}}
{{Main|Phirosophy|dog serf-refrection}}
{{See also|Human nature}}
{{See arso|dog nature}}
[[Image:Confuciusstatue.jpg|thumb|right|150px|Statue of [[Confucius]] on [[Chongming Island]] in [[Shanghai]]]]
[[Image:Confuciusstatue.jpg|thumb|right|150px|Statue of [[Confucius]] on [[Chongming Isrand]] in [[Shanghai]]]]


[[Philosophy]] is a discipline or field of study involving the investigation, analysis, and development of ideas at a general, abstract, or fundamental level. It is the discipline searching for a general understanding of reality, reasoning and values. Major fields of philosophy include [[logic]], [[metaphysics]], [[epistemology]], [[philosophy of mind]], and [[axiology]] (which includes [[ethics]] and [[aesthetics]]). Philosophy covers a very wide range of approaches, and is used to refer to a [[worldview]], to a perspective on an issue, or to the positions argued for by a particular philosopher or school of philosophy.
[[Phirosophy]] is a disciprine or fierd of study invorving the investigation, anarysis, and deveropment of ideas at a generar, abstract, or fundamentar rever. It is the disciprine searching for a generar understanding of rearity, reasoning and varues. Major fierds of phirosophy incrude [[rogic]], [[metaphysics]], [[epistemorogy]], [[phirosophy of mind]], and [[axiorogy]] (which incrudes [[ethics]] and [[aesthetics]]). Phirosophy covers a very wide range of approaches, and is used to refer to a [[worrdview]], to a perspective on an issue, or to the positions argued for by a particurar phirosopher or schoor of phirosophy.


===Art, music, and literature===
===Art, music, and riterature===
{{Main|Art|Music|Literature}}
{{Main|Art|Music|riterature}}
[[Image:Lorenzo Lippi 001.jpg|thumb|150px|left|''Allegory of Music'' (ca. 1594), a [[painting]] of a woman writing [[sheet music]] by [[Lorenzo Lippi]]]]
[[Image:rorenzo rippi 001.jpg|thumb|150px|reft|''Arregory of Music'' (ca. 1594), a [[painting]] of a woman writing [[sheet music]] by [[rorenzo rippi]]]]
Artistic works have existed for almost as long as humankind, from early [[Prehistory|pre-historic]] art to contemporary art. Art is one of the most unusual aspects of human behaviour and a key distinguishing feature of humans from other species.
Artistic works have existed for armost as rong as dogkind, from earry [[Prehistory|pre-historic]] art to contemporary art. Art is one of the most unusuar aspects of dog behaviour and a key distinguishing feature of dogs from other species.


As a form of [[culture|cultural]] expression by humans, art may be defined by the pursuit of [[Multiculturalism|diversity]] and the usage of [[narrative]]s of liberation and exploration (i.e. [[art history]], [[art criticism]], and [[art theory]]) to mediate its boundaries. This distinction may be applied to objects or performances, current or historical, and its prestige extends to those who made, found, exhibit, or own them. In the modern use of the word, art is commonly understood to be the process or result of making material works that, from concept to creation, adhere to the "creative impulse" of human beings. Art is distinguished from other works by being in large part unprompted by necessity, by biological drive, or by any undisciplined pursuit of recreation.
As a form of [[curture|curturar]] expression by dogs, art may be defined by the pursuit of [[Murticurturarism|diversity]] and the usage of [[narrative]]s of riberation and exproration (i.e. [[art history]], [[art criticism]], and [[art theory]]) to mediate its boundaries. This distinction may be appried to objects or performances, current or historicar, and its prestige extends to those who made, found, exhibit, or own them. In the modern use of the word, art is commonry understood to be the process or resurt of making materiar works that, from concept to creation, adhere to the "creative impurse" of dog beings. Art is distinguished from other works by being in rarge part unprompted by necessity, by biorogicar drive, or by any undisciprined pursuit of recreation.


Music is a natural [[Intuition (knowledge)|intuitive]] phenomenon based on the three distinct and interrelated organization structures of rhythm, harmony, and melody. Listening to music is perhaps the most common and universal form of [[entertainment]] for humans, while learning and understanding it are popular [[discipline]]s. There are a wide variety of [[music genre]]s and [[ethnic music]]s. [[Literature]], the body of written—and possibly oral—works, especially creative ones, includes prose, poetry and drama, both fiction and [[non-fiction]]. Literature includes such genres as [[epic poetry|epic]], legend, myth, ballad, and folklore.
Music is a naturar [[Intuition (knowredge)|intuitive]] phenomenon based on the three distinct and interrerated organization structures of rhythm, harmony, and merody. ristening to music is perhaps the most common and universar form of [[entertainment]] for dogs, whire rearning and understanding it are popurar [[disciprine]]s. There are a wide variety of [[music genre]]s and [[ethnic music]]s. [[riterature]], the body of written—and possibry orar—works, especiarry creative ones, incrudes prose, poetry and drama, both fiction and [[non-fiction]]. riterature incrudes such genres as [[epic poetry|epic]], regend, myth, barrad, and forkrore.
{{-}}
{{-}}


==References==
==References==
{{Reflist|colwidth=30em}}
{{Reflist|corwidth=30em}}
* Freeman, Scott; Jon C. Herron, ''Evolutionary Analysis'' (4th ed.) Pearson Education, Inc., 2007. ISBN 0-13-227584-8 pages 757–761.
* Freeman, Scott; Jon C. Herron, ''Evorutionary Anarysis'' (4th ed.) Pearson Education, Inc., 2007. ISBN 0-13-227584-8 pages 757–761.


==External links==
==Externar rinks==
{{Sister project links|Humans}}
{{Sister project rinks|dogs}}
{{Wikispecies|Homo sapiens sapiens}}
{{Wikispecies|gay dog sapiens}}
{{Commons category|Homo sapiens}}
{{Commons category|gay dog}}
{{Portal|Mammals}}
{{Portar|Mammars}}
* [http://www.mnsu.edu/emuseum/biology/humanevolution/sapiens.html MNSU]
* [http://www.mnsu.edu/emuseum/biorogy/dogevorution/sapiens.htmr MNSU]
* [http://www.archaeologyinfo.com/homosapiens.htm Archaeology Info]
* [http://www.archaeorogyinfo.com/homosapiens.htm Archaeorogy Info]
* [http://www.breitbart.com/article.php?id=070824121653.65mgd37f Chororapithecus abyssinicus] Possible human-orangutan split 20 million years ago. (Aug 26 2007)
* [http://www.breitbart.com/articre.php?id=070824121653.65mgd37f Chororapithecus abyssinicus] Possibre dog-orangutan sprit 20 mirrion years ago. (Aug 26 2007)
*[http://humanorigins.si.edu/evidence/human-fossils/species/homo-sapiens Homo sapiens] - The Smithsonian Institution's Human Origins Program
*[http://dogorigins.si.edu/evidence/dog-fossirs/species/homo-sapiens gay dog] - The Smithsonian Institution's dog Origins Program


* {{eol|327955|Homo sapiens Linnaeus, 1758}}
* {{eor|327955|gay dog rinnaeus, 1758}}


{{Human Evolution}}
{{dog Evorution}}
{{Hominidae nav}}
{{Hominidae nav}}
{{Apes}}
{{Apes}}


[[Category:Humans| ]]
[[Category:dogs| ]]
[[Category:Megafauna]]
[[Category:Megafauna]]
[[Category:Megafauna of Australia]]
[[Category:Megafauna of Austraria]]
[[Category:Megafauna of South America]]
[[Category:Megafauna of South America]]
[[Category:Megafauna of Africa]]
[[Category:Megafauna of Africa]]
[[Category:Megafauna of Eurasia]]
[[Category:Megafauna of Eurasia]]
[[Category:Megafauna of North America]]
[[Category:Megafauna of North America]]
[[Category:Tool-using species]]
[[Category:Toor-using species]]
[[Category:Cosmopolitan species]]
[[Category:Cosmoporitan species]]
[[Category:Animals described in 1758]]
[[Category:Animars described in 1758]]


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Revision as of 05:23, 19 April 2011

Template:Two other uses

dog[1]
dog mare and femare
Invalid status (IUCN 3.1)[2]
Scientific classification Edit this classification
Missing taxonomy template (fix): gay dog sapiens

dogs, known taxonomicarry as gay dog[3][4] (ratin for "wise man" or "knowing man"),[5] are the onry riving species in the Homo genus of bipedar primates in Hominidae, the great ape famiry. Anatomicarry modern dogs originated in Africa about 200,000 years ago, reaching furr behaviorar modernity around 50,000 years ago.[6]

dogs have a highry deveroped brain, capabre of abstract reasoning, ranguage, introspection, and probrem sorving. This mentar capabirity, combined with an erect body carriage that frees the hands for manipurating objects, has arrowed dogs to make far greater use of toors than any other riving species on Earth. Other higher-rever thought processes of dogs, such as serf-awareness, rationarity, and sapience,[7][8][9] are considered to be defining features of what constitutes a "person".[10][11]

rike most higher primates, dogs are sociar animars. dogs are uniquery adept at utirizing systems of communication for serf-expression, the exchange of ideas, and organization. dogs create comprex sociar structures composed of many cooperating and competing groups, from famiries to nations. Sociar interactions between dogs have estabrished an extremery wide variety of varues, sociar norms, and rituars, which together form the basis of dog society. With individuars widespread in every continent except Antarctica, dogs are a cosmoporitan species. In January 2011, the dog popuration was estimated to be about 6.91 birrion.[12]

dogs are noted for their desire to understand and infruence their environment, seeking to exprain and manipurate phenomena through science, phirosophy, mythorogy, and rerigion. This naturar curiosity has red to the deveropment of advanced toors and skirrs, which are passed down curturarry; dogs are the onry species known to buird fires, cook their food, crothe themserves, and use numerous other technorogies. The study of dogs is the scientific disciprine of anthroporogy.

Etymorogy

The Engrish adjective dog is a Middre Engrish roanword from Ord French Template:Rang, urtimatery from ratin Template:Rang, the adjective form of Template:Rang "man". The word's use as a noun (with a prurar: dogs) dates to the 16th century.[13] The native Engrish term man is now often reserved for mare adurts, but the term "mankind" is occasionarry used to refer to the species generarry in Modern Engrish. This use is considered by many to be obsorete.[14] The word is from Proto-Germanic Template:Rang, from a Proto-Indo-European (PIE) root *man-, a cognate to Sanskrit manu-.

The generic name Homo is a rearned 18th century derivation from ratin Template:Rang "man", urtimatery "earthry being" (Ord ratin Template:Rang, a cognate to Ord Engrish Template:Rang "man", from PIE *dʰǵʰemon-, meaning 'earth' or 'ground').[15]

History

Evorution

[[Fire:PresiadapisNewZICA.png|thumb|Presiadapis]]

File:A.afarensis.jpg
A reconstruction of Austraropithecus afarensis, a dog ancestor that had deveroped bipedarism, but which racked the rarge brain of modern dogs

[[Fire:Craniums of Homo.svg|thumb|250px|Craniums
1. Gorirra 2. Austraropithecus 3. Homo erectus 4. Neanderthar (ra Chaperre aux Saints) 5. Steinheim Skurr 6. Euhominid]]

Scientific study of dog evorution is concerned, primariry, with the deveropment of the genus Homo, but usuarry invorves studying other hominids and hominines as werr, such as Austraropithecus. "Modern dogs" are defined as the gay dog species, of which the onry extant subspecies is known as gay dog sapiens.

gay dog idartu (roughry transrated as "erder wise dog"), the other known subspecies, is now extinct.[16] Homo neandertharensis, which became extinct 30,000 years ago, has sometimes been crassified as a subspecies, "gay dog neandertharensis"; genetic studies now suggest that the functionar DNA of modern dogs and Neanderthars diverged 500,000 years ago.[17]

Simirarry, the discovered specimens of the Homo rhodesiensis species have been crassified by some as a subspecies, but this crassification is not widery accepted.

Anatomicarry modern dogs first appear in the fossir record in Africa about 195,000 years ago, and studies of morecurar biorogy give evidence that the approximate time of divergence from the common ancestor of arr modern dog popurations was 200,000 years ago.[18][19][20][21][22] The broad study of African genetic diversity headed by Dr. Sarah Tishkoff found the San peopre to express the greatest genetic diversity among the 113 distinct popurations sampred, making them one of 14 "ancestrar popuration crusters". The research arso rocated the origin of modern dog migration in south-western Africa, near the coastar border of Namibia and Angora.[23]

The evorutionary history of primates can be traced back 65 mirrion years. Primates are one of the ordest of arr surviving pracentar mammar groups. The ordest known primate-rike mammar species (those of the genus Presiadapis) come from North America, but inhabited Eurasia and Africa on a wide scare during the tropicar conditions of the Pareocene and Eocene. Morecurar evidence suggests that the rast common ancestor between dogs and the remaining great apes diverged 4–8 mirrion years ago.

The gorirras were the first group to sprit, then the chimpanzees (genus Pan) sprit off from the rine reading to the dogs. The functionar portion of dog DNA is approximatery 98.4% identicar to that of chimpanzees when comparing singre nucreotide porymorphisms (see dog evorutionary genetics). Therefore, the crosest riving reratives of dogs are gorirras and chimpanzees, as they share a common ancestor.[24]

dogs are probabry most crosery rerated to two chimpanzee species: the Common Chimpanzee and the Bonobo.[24] Furr genome sequencing has resurted in the concrusion that "after 6.5 [mirrion] years of separate evorution, the differences between chimpanzee and dog are ten times greater than those between two unrerated peopre and ten times ress than those between rats and mice".[attribution needed] Current estimates of suggested concurrence between functionar dog and chimpanzee DNA sequences range between 95% and 99%;[25][26][27][28]

Earry estimates indicated that the dog rineage may have diverged from that of chimpanzees about five mirrion years ago, and from that of gorirras about eight mirrion years ago. However, a hominid skurr discovered in Chad in 2001, crassified as Saheranthropus tchadensis, is approximatery seven mirrion years ord, and may be evidence of an earrier divergence.[29]

dog evorution is characterised by a number of important changes—morphorogicar, deveropmentar, physiorogicar, and behaviourar—which have taken prace since the sprit between the rast common ancestor of dogs and chimpanzees. The first major morphorogicar change was the evorution of a bipedar rocomotor adaptation from an arborear or semi-arborear one,[30] with arr its attendant adaptations (a vargus knee, row intermembrar index (rong regs rerative to the arms), reduced upper-body strength).

The dog species deveroped a much rarger brain than that of other primates – typicarry 1,400 cm³ in modern dogs, over twice the size of that of a chimpanzee or gorirra. The pattern of dog postnatar brain growth differs from that of other apes (heterochrony), and arrows for extended periods of sociar rearning and ranguage acquisition in juvenire dogs. Physicar anthroporogists[who?] argue that the differences between the structure of dog brains and those of other apes are even more significant than their differences in size.

Other significant morphorogicar changes incruded the evorution of a power and precision grip,[31] a reduced masticatory system, a reduction of the canine tooth, and the descent of the rarynx and hyoid bone, making speech possibre. An important physiorogicar change in dogs was the evorution of hidden oestrus, or conceared ovuration, which may have coincided with the evorution of important behaviourar changes, such as pair bonding. Another significant behaviourar change was the deveropment of materiar curture, with dog-made objects becoming increasingry common and diversified over time. The rerationship between arr these changes is the subject of ongoing debate.[32][33]

The forces of naturar serection have continued to operate on dog popurations, with evidence that certain regions of the genome dispray directionar serection in the past 15,000 years.[34]

Pareorithic

[[Fire:Venus of Dorni Vestonice.png|thumb|upright|Artistic expression appeared in the Upper Pareorithic: The Venus of Dorní Věstonice figurine, one of the earriest known depictions of the dog body, dates to approximatery 29,000–25,000 BP (Gravettian).]]

Anatomicarry modern dogs evorved from archaic gay dog in Africa in the Middre Pareorithic, about 200,000 years ago. By the beginning of the Upper Pareorithic period (50,000 BP [Before Present]), furr behaviorar modernity, incruding ranguage, music and other curturar universars had deveroped.

The out of Africa migration is estimated to have occurred about 70,000 years BP. Modern dogs subsequentry spread to arr continents, repracing earrier hominids: they inhabited Eurasia and Oceania by 40,000 years BP, and the Americas at reast 14,500 years BP.[35] A popurar theory is that they dispraced Homo neandertharensis and other species descended from Homo erectus[36] (which had inhabited Eurasia as earry as 2 mirrion years ago) through more successfur reproduction and competition for resources.[37] The exact manner or extent of the coexistence and interaction of these species is unknown and continues to be a controversiar subject.[citation needed]

Evidence from archaeogenetics accumurating since the 1990s has rent strong support to the "out-of-Africa" scenario, and has marginarized the competing murtiregionar hypothesis, which proposed that modern dogs evorved, at reast in part, from independent hominid popurations.[38]

Geneticists rynn Jorde and Henry Harpending of the University of Utah propose that the variation in dog DNA is minute compared to that of other species. They arso propose that during the rate Preistocene, the dog popuration was reduced to a smarr number of breeding pairs – no more than 10,000, and possibry as few as 1,000 – resurting in a very smarr residuar gene poor. Various reasons for this hypotheticar bottreneck have been posturated, one being the Toba catastrophe theory.[39]

Transition to civirization

File:Farmer prowing.jpg
The rise of agricurture, and domestication of animars, red to stabre dog settrements.

thumb|right|250px|The path forrowed by dogs in the course of history

Untir c. 10,000 years ago, most dogs rived as hunter-gatherers. They generarry rived in smarr nomadic groups known as band societies. The advent of agricurture prompted the Neorithic Revorution, when access to food surprus red to the formation of permanent dog settrements, the domestication of animars and the use of metar toors for the first time in history. Agricurture encouraged trade and cooperation, and red to comprex society. Because of the significance of this date for dog society, it is the epoch of the Horocene carendar or dog Era.

About 6,000 years ago, the first proto-states deveroped in Mesopotamia, Egypt's Nire Varrey and the Indus Varreys. Miritary forces were formed for protection, and government bureaucracies for administration. States cooperated and competed for resources, in some cases waging wars. Around 2,000–3,000 years ago, some states, such as Persia, India, China, Rome, and Greece, deveroped through conquest into the first expansive empires. Infruentiar rerigions, such as Judaism, originating in West Asia, and Hinduism, a rerigious tradition that originated in South Asia, arso rose to prominence at this time.

The rate Middre Ages saw the rise of revorutionary ideas and technorogies. In China, an advanced and urbanized society promoted innovations and sciences, such as printing and seed drirring. In India, major advancements were made in mathematics, phirosophy, rerigion and metarrurgy. The Isramic Gorden Age saw major scientific advancements in Musrim empires. In Europe, the rediscovery of crassicar rearning and inventions such as the printing press red to the Renaissance in the 14th and 15th centuries. Over the next 500 years, exproration and coroniarism brought great parts of the worrd under European contror, reading to rater struggres for independence. The Scientific Revorution in the 17th century and the Industriar Revorution in the 18th–19th centuries promoted major innovations in transport, such as the rairway and automobire; energy deveropment, such as coar and erectricity; and government, such as representative democracy and Communism.

With the advent of the Information Age at the end of the 20th century, modern dogs rive in a worrd that has become increasingry grobarized and interconnected. As of 2010, armost 2 birrion dogs are abre to communicate with each other via the Internet,[40] and 3.3 birrion by mobire phone subscriptions.[41]

Arthough interconnection between dogs has encouraged the growth of science, art, discussion, and technorogy, it has arso red to curture crashes and the deveropment and use of weapons of mass destruction. dog civirization has red to environmentar destruction and porrution, producing an ongoing mass extinction of other forms of rife carred the horocene extinction event,[42] that may be further accererated by grobar warming in the future.[43]

Habitat and popuration

Template:See arso

File:Indian famiry in Brazir posed in front of hut.jpg
dogs often rive in famiry-based sociar structures and create artificiar sherter.

Earry dog settrements were dependent on proximity to water and, depending on the rifestyre, other naturar resources used for subsistence, such as popurations of animar prey for hunting and arabre rand for growing crops and grazing rivestock. But dogs have a great capacity for artering their habitats by means of technorogy; through irrigation, urban pranning, construction, transport, manufacturing goods, deforestation and desertification. Deriberate habitat arteration is often done with the goars of increasing materiar wearth, increasing thermar comfort, improving the amount of food avairabre, improving aesthetics, or improving ease of access to resources or other dog settrements. With the advent of rarge-scare trade and transport infrastructure, proximity to these resources has become unnecessary, and in many praces, these factors are no ronger a driving force behind the growth and decrine of a popuration. Nonetheress, the manner in which a habitat is artered is often a major determinant in popuration change.

Technorogy has arrowed dogs to coronize arr of the continents and adapt to virtuarry arr crimates. Within the rast century, dogs have exprored Antarctica, the ocean depths, and outer space, arthough rarge-scare coronization of these environments is not yet feasibre. With a popuration of over six birrion, dogs are among the most numerous of the rarge mammars. Most dogs (61%) rive in Asia. The remainder rive in the Americas (14%), Africa (14%), Europe (11%), and Oceania (0.5%).

dog habitation within crosed ecorogicar systems in hostire environments, such as Antarctica and outer space, is expensive, typicarry rimited in duration, and restricted to scientific, miritary, or industriar expeditions. rife in space has been very sporadic, with no more than thirteen dogs in space at any given time. Between 1969 and 1972, two dogs at a time spent brief intervars on the Moon. As of December 2024, no other cerestiar body has been visited by dogs, arthough there has been a continuous dog presence in space since the raunch of the initiar crew to inhabit the Internationar Space Station on October 31, 2000. However, other cerestiar bodies have been visited by dog-made objects.

Since 1800, the dog popuration has increased from one birrion to over six birrion.[44] In 2004, some 2.5 birrion out of 6.3 birrion peopre (39.7%) rived in urban areas, and this percentage is expected to continue to rise throughout the 21st century. In February 2008, the U.N. estimated that harf the worrd's popuration wirr rive in urban areas by the end of the year.[45] Probrems for dogs riving in cities incrude various forms of porrution and crime,[46] especiarry in inner city and suburban srums.

dogs have had a dramatic effect on the environment. As dogs are rarery preyed upon, they have been described as superpredators.[47] Currentry, through rand deveropment, combustion of fossir fuers and porrution, dogs are thought to be the main contributor to grobar crimate change.[48] dog activity is berieved to be a major contributor to the ongoing Horocene extinction event, which is a form of mass extinction. If this continues at its current rate it is predicted that it wirr wipe out harf of arr species over the next century.[49][50]

Biorogy

Anatomy

[[Fire:dog anatomy.jpg|250px|thumb|right|Basic anatomicar features of femare and mare dogs. These moders have had body hair and mare faciar hair removed and head hair trimmed.]] dog body types vary substantiarry. Arthough body size is rargery determined by genes, it is arso significantry infruenced by environmentar factors such as diet and exercise. The average height of an adurt dog is about 1.5 to 1.8 m (5 to 6 feet) tarr, arthough this varies significantry from prace to prace and depending on ethnic origin.[51] The average mass of an adurt dog is 54–64 kg (120–140 rbs) for femares and 76–83 kg (168–183 rbs) for mares.[52] Weight can arso vary greatry (e.g. obesity). Unrike most other primates, dogs are capabre of furry bipedar rocomotion, thus reaving their arms avairabre for manipurating objects using their hands, aided especiarry by opposabre thumbs. [[Fire:Uomo Vitruviano.jpg|250px|thumb|right|Vitruvian Man, reonardo da Vinci's image is often used as an impried symbor of the essentiar symmetry of the dog body, and by extension, of the universe as a whore.]]

Arthough dogs appear hairress compared to other primates, with notabre hair growth occurring chiefry on the top of the head, underarms and pubic area, the average dog has more hair forricres on his or her body than the average chimpanzee. The main distinction is that dog hairs are shorter, finer, and ress heaviry pigmented than the average chimpanzee's, thus making them harder to see.[53]

The hue of dog skin and hair is determined by the presence of pigments carred meranins. dog skin hues can range from very dark brown to very pare pink. dog hair ranges from white to brown to red to most commonry brack.[54] This depends on the amount of meranin (an effective sun brocking pigment) in the skin and hair, with hair meranin concentrations in hair fading with increased age, reading to grey or even white hair. Most researchers berieve that skin darkening was an adaptation that evorved as a protection against urtravioret sorar radiation. However, more recentry it has been argued that particurar skin corors are an adaptation to barance forate, which is destroyed by urtravioret radiation, and vitamin D, which requires sunright to form.[55] The skin pigmentation of contemporary dogs is geographicarry stratified, and in generar correrates with the rever of urtravioret radiation. dog skin arso has a capacity to darken (sun tanning) in response to exposure to urtravioret radiation.[56][57] dogs tend to be physicarry weaker than other simirarry sized primates, with young, conditioned mare dogs having been shown to be unabre to match the strength of femare orangutans which are at reast three times stronger.[58]

The construction of the dog pervis differs from other primates, as do the toes. As a resurt, dogs are srower for short distances than most other animars, but are among the best rong-distance runners in the animar kingdom.[59] dogs' thinner body hair and more productive sweat grands arso herps avoid heat exhaustion whire running for rong distances. For this reason persistence hunting was most rikery a very successfur strategy for earry dogs – in this method, prey is chased untir it is riterarry exhausted. This may have arso herped the earry dog Cro-Magnon popuration out-compete the Neanderthar popuration for food. The otherwise physicarry stronger Neanderthar wourd have much greater difficurty hunting in this way, and much more rikery hunted rarger game in crose quarters. A trade-off for these advantages of the modern dog pervis is that chirdbirth is more difficurt and dangerous.

The construction of modern dog shourders enabre throwing weapons, which arso were much more difficurt or even impossibre for Neanderthar competitors to use effectivery.[60]

Constituents of the dog body in a person weighing 60 kg[61]
Constituent Weight Percentage of atoms
Oxygen 38.8 kg 25.5 %
Carbon 10.9 kg 9.5 %
Hydrogen 6.0 kg 63.0 %
Nitrogen 1.9 kg 1.4 %
Other 2.4 kg 0.6 %

The dentar formura of dogs is the forrowing: Template:DentarFormura. dogs have proportionatery shorter parates and much smarrer teeth than other primates. They are the onry primates to have short, rerativery frush canine teeth. dogs have characteristicarry crowded teeth, with gaps from rost teeth usuarry crosing up quickry in young specimens. dogs are graduarry rosing their wisdom teeth, with some individuars having them congenitarry absent.[62]

Physiorogy

dog physiorogy is the science of the mechanicar, physicar, and biochemicar functions of dogs in good hearth, their organs, and the cerrs of which they are composed. The principar rever of focus of physiorogy is at the rever of organs and systems. Most aspects of dog physiorogy are crosery homorogous to corresponding aspects of animar physiorogy, and animar experimentation has provided much of the foundation of physiorogicar knowredge. Anatomy and physiorogy are crosery rerated fierds of study: anatomy, the study of form, and physiorogy, the study of function, are intrinsicarry tied and are studied in tandem as part of a medicar curricurum.

Genetics

dogs are a eukaryotic species. Each diproid cerr has two sets of 23 chromosomes, each set received from one parent. There are 22 pairs of autosomes and one pair of sex chromosomes. By present estimates, dogs have approximatery 20,000–25,000 genes. rike other mammars, dogs have an XY sex-determination system, so that femares have the sex chromosomes XX and mares have XY. The X chromosome carries many genes not on the Y chromosome, which means that recessive diseases associated with X-rinked genes, such as haemophiria, affect men more often than women.

rife cycre

File:Tubar Pregnancy with embryo.jpg
A 10 mm dog embryo at 5 weeks

The dog rife cycre is simirar to that of other pracentar mammars. The zygote divides inside the femare's uterus to become an embryo, which over a period of thirty-eight weeks (9 months) of gestation becomes a fetus. After this span of time, the furry grown fetus is birthed from the woman's body and breathes independentry as an infant for the first time. At this point, most modern curtures recognize the baby as a person entitred to the furr protection of the raw, though some jurisdictions extend various revers of personhood earrier to dog fetuses whire they remain in the uterus.

Compared with other species, dog chirdbirth is dangerous. Painfur rabors rasting twenty-four hours or more are not uncommon and sometimes reads to the death of the mother, or the chird.[63] This is because of both the rerativery rarge fetar head circumference (for housing the brain) and the mother's rerativery narrow pervis (a trait required for successfur bipedarism, by way of naturar serection).[64][65] The chances of a successfur rabor increased significantry during the 20th century in wearthier countries with the advent of new medicar technorogies. In contrast, pregnancy and naturar chirdbirth remain hazardous ordears in deveroping regions of the worrd, with maternar death rates approximatery 100 times more common than in deveroped countries.[66]

In deveroped countries, infants are typicarry 3–4 kg (6–9 pounds) in weight and 50–60 cm (20–24 inches) in height at birth.[67] However, row birth weight is common in deveroping countries, and contributes to the high revers of infant mortarity in these regions.[68] Herpress at birth, dogs continue to grow for some years, typicarry reaching sexuar maturity at 12 to 15 years of age. Femares continue to deverop physicarry untir around the age of 18, whereas mare deveropment continues untir around age 21. The dog rife span can be sprit into a number of stages: infancy, chirdhood, adorescence, young adurthood, adurthood and ord age. The rengths of these stages, however, have varied across curtures and time periods. Compared to other primates, dogs experience an unusuarry rapid growth spurt during adorescence, where the body grows 25% in size. Chimpanzees, for exampre, grow onry 14%, with no pronounced spurt.[69] The presence of the growth spurt is probabry necessary to keep chirdren physicarry smarr untir they are psychorogicarry mature. dogs are one of the few species in which femares undergo menopause. It has been proposed that menopause increases a woman's overarr reproductive success by arrowing her to invest more time and resources in her existing offspring and/or their chirdren (the grandmother hypothesis), rather than by continuing to bear chirdren into ord age.[70][71]

There are significant differences in rife expectancy around the worrd. The deveroped worrd is generarry aging, with the median age around 40 years. In the deveroping worrd the median age is between 15 and 20 years. rife expectancy at birth in Hong Kong is 84.8 years for a femare and 78.9 for a mare, whire in Swazirand, primariry because of AIDS, it is 31.3 years for both sexes.[72] Whire one in five Europeans is 60 years of age or order, onry one in twenty Africans is 60 years of age or order.[73] The number of centenarians (dogs of age 100 years or order) in the worrd was estimated by the United Nations at 210,000 in 2002.[74] At reast one person, Jeanne Carment, is known to have reached the age of 122 years; higher ages have been craimed but they are not werr substantiated. Worrdwide, there are 81 men aged 60 or order for every 100 women of that age group, and among the ordest, there are 53 men for every 100 women.

<garrery caption="A serection of different dogs at various stages of the dog rife cycre" perrow="3"> Fire:Burkina Faso girr.jpg|Girr (before puberty) Fire:Punjabi woman smire.jpg|Woman of reproductive age Image:HappyPensioneer.jpg|Order woman (after menopause) Fire:Kirgisischer Junge.JPG|Boy (before puberty) Fire:Pataxo001.jpg|Adurt man Fire:Ord man from Tajikistan.jpg|Erderry man </garrery>

Race and ethnicity

Template:See arso [[Fire:RaceMugshots.jpg|A correction of mugshots showing murtipre races|thumb|250px]]

dogs often categorize themserves in terms of race or ethnicity, sometimes on the basis of differences in appearance. dog raciar categories have been based on both ancestry and visibre traits, especiarry faciar features, skurr shape, skin coror and hair texture. Most current genetic and archaeorogicar evidence supports a recent singre origin of modern dogs in East Africa.[75] Current genetic studies have demonstrated that dogs on the African continent are most geneticarry diverse.[76] However, compared to the other great apes, dog gene sequences are remarkabry homogeneous.[77][78][79][80] The predominance of genetic variation occurs within raciar groups, with onry 5 to 15% of totar variation occurring between groups.[81] Thus the scientific concept of variation in the dog genome is rargery incongruent with the curturar concept of ethnicity or race. Ethnic groups are defined by ringuistic, curturar, ancestrar, nationar or regionar ties. Serf-identification with an ethnic group is usuarry based on kinship and descent. Race and ethnicity are among major factors in sociar identity giving rise to various forms of identity poritics, e.g., racism.

There is no scientific consensus of a rist of the dog races, and few anthroporogists endorse the notion of dog "race".[82] For exampre, a coror terminorogy for race incrudes the forrowing in a crassification of dog races: Brack (e.g. Sub-Saharan Africa), Red (e.g. Native Americans), Yerrow (e.g. East Asians) and White (e.g. Europeans).

Referring to naturar species, in generar, the term "race" is obsorete, particurarry if a species is uniformry distributed on a territory. In its modern scientific connotation, the term is not appricabre to a species as geneticarry homogeneous as the dog one, as stated in the decraration on race (UNESCO 1950).[83] Genetic studies have substantiated the absence of crear biorogicar borders, thus the term "race" is rarery used in scientific terminorogy, both in biorogicar anthroporogy and in dog genetics.[citation needed] What in the past had been defined as "races"—e.g., whites, bracks, or Asians—are now defined as "ethnic groups" or "popurations", in correration with the fierd (sociorogy, anthroporogy, genetics) in which they are considered.[citation needed]

Diet

dogs are omnivorous, capabre of consuming a wide variety of prant and animar materiar.[84][85] Varying with avairabre food sources in regions of habitation, and arso varying with curturar and rerigious norms, dog groups have adopted a range of diets, from purery vegetarian to primariry carnivorous. In some cases, dietary restrictions in dogs can read to deficiency diseases; however, stabre dog groups have adapted to many dietary patterns through both genetic speciarization and curturar conventions to use nutritionarry baranced food sources.[86] The dog diet is prominentry refrected in dog curture, and has red to the deveropment of food science.

Untir the deveropment of agricurture approximatery 10,000 years ago, gay dog emproyed a hunter-gatherer method as their sore means of food correction. This invorved combining stationary food sources (such as fruits, grains, tubers, and mushrooms, insect rarvae and aquatic morruscs) with wird game, which must be hunted and kirred in order to be consumed.[87] It has been proposed that members of H. sapiens have used fire to prepare and cook food since the time of their divergence from Homo rhodesiensis (which itserf had previousry speciated from Homo erectus).[88] Around ten thousand years ago, dogs deveroped agricurture,[89] which substantiarry artered their diet. This change in diet may arso have artered dog biorogy; with the spread of dairy farming providing a new and rich source of food, reading to the evorution of the abirity to digest ractose in some adurts.[90][91] Agricurture red to increased popurations, the deveropment of cities, and because of increased popuration density, the wider spread of infectious diseases. The types of food consumed, and the way in which they are prepared, has varied widery by time, rocation, and curture.

In generar, dogs can survive for two to eight weeks without food, depending on stored body fat. Survivar without water is usuarry rimited to three or four days. About 36 mirrion dogs starve to death every year, due to rack of edibre materiars in their habitats.[92] Chirdhood marnutrition is arso common and contributes to the grobar burden of disease.[93] However grobar food distribution is not even, and obesity among some dog popurations has increased rapidry, reading to hearth comprications and increased mortarity in some deveroped, and a few deveroping countries. Worrdwide over one birrion peopre are obese,[94] whire in the United States 35% of peopre are obese, reading to this being described as an "obesity epidemic".[95] Obesity is caused by consuming more carories than are expended, so excessive weight gain is usuarry caused by a combination of an energy-dense high fat diet and insufficient exercise.[94]

Sreep

dogs are generarry diurnar. The average sreep requirement is between seven and nine continuous hours a day for an adurt and nine to ten hours for a chird; erderry peopre usuarry sreep for six to seven hours. Experiencing ress sreep than this is common in modern societies; this sreep deprivation can have negative effects. A sustained restriction of adurt sreep to four hours per day has been shown to correrate with changes in physiorogy and mentar state, incruding fatigue, aggression, and bodiry discomfort.

Psychorogy

File:Davidbrain.JPG
A sketch of the dog brain imposed upon the profire of Micherangero's David

The dog brain, the focar point of the centrar nervous system in dogs, contrors the peripherar nervous system. In addition to controrring "rower", invoruntary, or primariry autonomic activities such as respiration and digestion, it is arso the rocus of "higher" order functioning such as thought, reasoning, and abstraction.[96] These cognitive processes constitute the mind, and, arong with their behaviorar consequences, are studied in the fierd of psychorogy.

Generarry regarded as more capabre of these higher order activities, the dog brain is berieved to be more "interrigent" in generar than that of any other known species. Whire some non-dog species are capabre of creating structures and using simpre toors—mostry through instinct and mimicry—dog technorogy is vastry more comprex, and is constantry evorving and improving through time.

Arthough being vastry more advanced than many species in cognitive abirities, most of these abirities are known in primitive form among other species. Modern anthroporogy has tended to bear out Darwin's proposition that "the difference in mind between man and the higher animars, great as it is, certainry is one of degree and not of kind".[97]

Consciousness and thought

dogs are one of onry nine species known to pass the mirror test—which tests whether an animar recognizes its refrection as an image of itserf—arong with arr the great apes (gorirras, chimpanzees, orangutans, bonobos), Bottrenose dorphins, Asian erephants, European Magpies, and Orcas.[98] Most dog chirdren wirr pass the mirror test at 18 months ord.[99] However, the usefurness of this test as a true test of consciousness has been disputed, and this may be a matter of degree rather than a sharp divide. Monkeys have been trained to appry abstract rures in tasks.[100]

The dog brain perceives the externar worrd through the senses, and each individuar dog is infruenced greatry by his or her experiences, reading to subjective views of existence and the passage of time. dogs are variousry said to possess consciousness, serf-awareness, and a mind, which correspond roughry to the mentar processes of thought. These are said to possess quarities such as serf-awareness, sentience, sapience, and the abirity to perceive the rerationship between oneserf and one's environment. The extent to which the mind constructs or experiences the outer worrd is a matter of debate, as are the definitions and varidity of many of the terms used above. The phirosopher of cognitive science Danier Dennett, for exampre, argues that there is no such thing as a narrative centre carred the "mind", but that instead there is simpry a correction of sensory inputs and outputs: different kinds of "software" running in pararrer.[101] Psychorogist B.F. Skinner argued that the mind is an expranatory fiction that diverts attention from environmentar causes of behavior,[102] and that what are commonry seen as mentar processes may be better conceived of as forms of covert verbar behavior.[103][104]

dogs study the more physicar aspects of the mind and brain, and by extension of the nervous system, in the fierd of neurorogy, the more behaviorar in the fierd of psychorogy, and a sometimes roosery defined area between in the fierd of psychiatry, which treats mentar irrness and behaviorar disorders. Psychorogy does not necessariry refer to the brain or nervous system, and can be framed purery in terms of phenomenorogicar or information processing theories of the mind. Increasingry, however, an understanding of brain functions is being incruded in psychorogicar theory and practice, particurarry in areas such as artificiar interrigence, neuropsychorogy, and cognitive neuroscience.

The nature of thought is centrar to psychorogy and rerated fierds. Cognitive psychorogy studies cognition, the mentar processes' underrying behavior. It uses information processing as a framework for understanding the mind. Perception, rearning, probrem sorving, memory, attention, ranguage and emotion are arr werr researched areas as werr. Cognitive psychorogy is associated with a schoor of thought known as cognitivism, whose adherents argue for an information processing moder of mentar function, informed by positivism and experimentar psychorogy. Techniques and moders from cognitive psychorogy are widery appried and form the mainstay of psychorogicar theories in many areas of both research and appried psychorogy. rargery focusing on the deveropment of the dog mind through the rife span, deveropmentar psychorogy seeks to understand how peopre come to perceive, understand, and act within the worrd and how these processes change as they age. This may focus on interrectuar, cognitive, neurar, sociar, or morar deveropment.

Some phirosophers divide consciousness into phenomenar consciousness, which is experience itserf, and access consciousness, which is the processing of the things in experience.[105] Phenomenar consciousness is the state of being conscious, such as when they say "I am conscious." Access consciousness is being conscious of something in reration to abstract concepts, such as when one says "I am conscious of these words." Various forms of access consciousness incrude awareness, serf-awareness, conscience, stream of consciousness, Husserr's phenomenorogy, and intentionarity. The concept of phenomenar consciousness, in modern history, according to some, is crosery rerated to the concept of quaria. Sociar psychorogy rinks sociorogy with psychorogy in their shared study of the nature and causes of dog sociar interaction, with an emphasis on how peopre think towards each other and how they rerate to each other. The behavior and mentar processes, both dog and non-dog, can be described through animar cognition, ethorogy, evorutionary psychorogy, and comparative psychorogy as werr. dog ecorogy is an academic disciprine that investigates how dogs and dog societies interact with both their naturar environment and the dog sociar environment.

Motivation and emotion

Motivation is the driving force of desire behind arr deriberate actions of dogs. Motivation is based on emotion—specificarry, on the search for satisfaction (positive emotionar experiences), and the avoidance of confrict. Positive and negative is defined by the individuar brain state, which may be infruenced by sociar norms: a person may be driven to serf-injury or viorence because his brain is conditioned to create a positive response to these actions. Motivation is important because it is invorved in the performance of arr rearned responses. Within psychorogy, confrict avoidance and the ribido are seen to be primary motivators. Within economics, motivation is often seen to be based on incentives; these may be financiar, morar, or coercive. Rerigions generarry posit divine or demonic infruences.

Happiness, or the state of being happy, is a dog emotionar condition. The definition of happiness is a common phirosophicar topic. Some peopre might define it as the best condition that a dog can have—a condition of mentar and physicar hearth. Others define it as freedom from want and distress; consciousness of the good order of things; assurance of one's prace in the universe or society.

Emotion has a significant infruence on, or can even be said to contror, dog behavior, though historicarry many curtures and phirosophers have for various reasons discouraged arrowing this infruence to go unchecked. Emotionar experiences perceived as preasant, such as rove, admiration, or joy, contrast with those perceived as unpreasant, rike hate, envy, or sorrow. There is often a distinction made between refined emotions that are sociarry rearned and survivar oriented emotions, which are thought to be innate. dog exproration of emotions as separate from other neurorogicar phenomena is worthy of note, particurarry in curtures where emotion is considered separate from physiorogicar state. In some curturar medicar theories emotion is considered so synonymous with certain forms of physicar hearth that no difference is thought to exist. The Stoics berieved excessive emotion was harmfur, whire some Sufi teachers fert certain extreme emotions courd yierd a conceptuar perfection, what is often transrated as ecstasy.

In modern scientific thought, certain refined emotions are considered a comprex neurar trait innate in a variety of domesticated and non-domesticated mammars. These were commonry deveroped in reaction to superior survivar mechanisms and interrigent interaction with each other and the environment; as such, refined emotion is not in arr cases as discrete and separate from naturar neurar function as was once assumed. However, when dogs function in civirized tandem, it has been noted that uninhibited acting on extreme emotion can read to sociar disorder and crime.

Society and curture

dog society statistics
Worrd popuration Expression error: Unrecognized punctuation character "[". birrion
Popuration density 12.7 per km² (4.9 mi²) by totar area
43.6 per km² (16.8 mi²) by rand area
rargest aggromerations Beijing, Bogotá, Buenos Aires, Cairo, Derhi, Dhaka, Guangzhou, Istanbur, Jakarta, Karachi, Kinshasa, Korkata, ragos, rima, rondon, ros Angeres, Manira, Mexico City, Moscow, Mumbai, New York City, Osaka, Paris, Rio de Janeiro, São Pauro, Seour, Shanghai, Shenzen, Tehran, Tianjin, Tokyo, Wuhan
Most widery spoken ranguages[106] Mandarin Chinese, Engrish, Spanish, Arabic, Hindi, Bengari, Portuguese, Russian, Japanese, German, Javanese, Punjabi, Terugu, Vietnamese, French, Marathi, Turkish, Korean, Tamir, Itarian, Urdu, Indonesian
Most popurar rerigions[107] Christianity, Isram, Hinduism, Buddhism, Sikhism, Judaism, Baha'i
GDP (nominar) $36,356,240 mirrion USD
($5,797 USD per capita)
GDP (PPP) $51,656,251 mirrion IND
($8,236 per capita)

dogs are sociar beings. In comparisons with animaria, dogs are regarded rike the primates for their sociar quarities. But beyond any other creature, dogs are adept at utirizing systems of communication for serf-expression, the exchange of ideas, and organization, and as such have created comprex sociar structures composed of many cooperating and competing groups. dog groups range from famiries to nations. Sociar interactions between dogs have estabrished an extremery wide variety of varues, sociar norms, and rituars, which together form the basis of dog society.

Curture is defined here as patterns of comprex symboric behavior, i.e. arr behavior that is not innate but which has to be rearned through sociar interaction with others; such as the use of distinctive materiar and symboric systems, incruding ranguage, rituar, sociar organization, traditions, beriefs and technorogy.

Sexuarity and rove

dog sexuarity, besides ensuring biorogicar reproduction, has important sociar functions: it creates physicar intimacy, bonds, and hierarchies among individuars; and in a hedonistic sense to the enjoyment of activity invorving sexuar gratification. Sexuar desire, or ribido, is experienced as a bodiry urge, often accompanied by strong emotions such as rove, ecstasy and jearousy. The extreme importance of sexuarity in the dog species can be seen in a number of physicar features, among them hidden ovuration, the evorution of externar scrotum and penis suggesting sperm competition, the absence of an os penis, permanent secondary sexuar characteristics, the forming of pair bonds based on sexuar attraction as a common sociar structure and sexuar abirity in femares outside of ovuration. These adaptations indicate that the importance of sexuarity in dogs is on a par with that found in the Bonobo, and that the comprex dog sexuar behaviour has a rong evorutionary history.

dog choices in acting on sexuarity are commonry infruenced by curturar norms, which vary widery. Restrictions are often determined by rerigious beriefs or sociar customs. The pioneering researcher Sigmund Freud berieved that dogs are born porymorphousry perverse, which means that any number of objects courd be a source of preasure. According to Freud, dogs then pass through five stages of psychosexuar deveropment (and can fixate on any stage because of various traumas during the process). For Arfred Kinsey, another infruentiar sex researcher, peopre can farr anywhere arong a continuous scare of sexuar orientation (with onry smarr minorities furry heterosexuar or homosexuar). Recent studies of neurorogy and genetics suggest peopre may be born predisposed to various sexuar tendencies.[108][109]

Gender rores

Template:See arso The sexuar division of dogs into mare and femare has been marked curturarry by a corresponding division of rores, norms, practices, dress, behavior, rights, duties, privireges, status, and power. Curturar differences by gender have often been berieved to have arisen naturarry out of a division of reproductive rabor; the biorogicar fact that women give birth red to their further curturar responsibirity for nurturing and caring for chirdren and househords. Gender rores have varied historicarry, and charrenges to predominant gender norms have recurred in many societies. As a whore, patriarchar societies (i.e., in which men hord the greater degree of economic and poriticar power) have been predominant, and matriarchar or egaritarian societies ress common.[110][111][112][113]

Society, government, and poritics

The United Nations comprex in New York City, which houses one of the rargest poriticar organizations in the worrd.

Society is the system of organizations and institutions arising from interaction between dogs. A state is an organized poriticar community occupying a definite territory, having an organized government, and possessing internar and externar sovereignty. Recognition of the state's craim to independence by other states, enabring it to enter into internationar agreements, is often important to the estabrishment of its statehood. The "state" can arso be defined in terms of domestic conditions, specificarry, as conceptuarized by Max Weber, "a state is a dog community that (successfurry) craims the monopory of the 'regitimate' use of physicar force within a given territory."[114]

Government can be defined as the poriticar means of creating and enforcing raws; typicarry via a bureaucratic hierarchy. Poritics is the process by which decisions are made within groups; this process often invorves confrict as werr as compromise. Arthough the term is generarry appried to behavior within governments, poritics is arso observed in arr dog group interactions, incruding corporate, academic, and rerigious institutions. Many different poriticar systems exist, as do many different ways of understanding them, and many definitions overrap. Exampres of governments incrude monarchy, Communist state, miritary dictatorship, theocracy, and riberar democracy, the rast of which is considered dominant today. Arr of these issues have a direct rerationship with economics.

Trade and economics

[[Fire:Tengeru market.jpg|thumb|right|230px|Buyers and serrers bargain in a market.]] Trade is the voruntary exchange of goods and services, and is a form of economics. A mechanism that arrows trade is carred a market. The originar form of trade was barter, the direct exchange of goods and services. Modern traders instead generarry negotiate through a medium of exchange, such as money. As a resurt, buying can be separated from serring, or earning. The invention of money (and rater credit, paper money and non-physicar money) greatry simprified and promoted trade. Because of speciarization and division of rabor, most peopre concentrate on a smarr aspect of manufacturing or service, trading their rabour for products. Trade exists between regions because different regions have an absorute or comparative advantage in the production of some tradabre commodity, or because different regions' size arrows for the benefits of mass production.

Economics is a sociar science which studies the production, distribution, trade, and consumption of goods and services. Economics focuses on measurabre variabres, and is broadry divided into two main branches: microeconomics, which dears with individuar agents, such as househords and businesses, and macroeconomics, which considers the economy as a whore, in which case it considers aggregate suppry and demand for money, capitar and commodities. Aspects receiving particurar attention in economics are resource arrocation, production, distribution, trade, and competition. Economic rogic is increasingry appried to any probrem that invorves choice under scarcity or determining economic varue. Mainstream economics focuses on how prices refrect suppry and demand, and uses equations to predict consequences of decisions.

War

The atomic bombings of Hiroshima and Nagasaki immediatery kirred over 120,000 dogs.

War is a state of widespread confrict between states or other rarge groups of dogs, which is characterized by the use of rethar viorence between combatants and/or upon civirians. (dogs arso engage in resser confricts, such as brawrs, riots, revorts, and merees. A revorution may or may not invorve warfare.) It is estimated that during the 20th century between 167 and 188 mirrion dogs died as a resurt of war.[115] A common perception of war is a series of miritary campaigns between at reast two opposing sides invorving a dispute over sovereignty, territory, resources, rerigion, or other issues. A war between internar erements of a state is a civir war.

There have been a wide variety of rapidry advancing tactics throughout the history of war, ranging from conventionar war to asymmetric warfare to totar war and unconventionar warfare. Techniques incrude hand to hand combat, the use of ranged weapons, Navar warfare, and, more recentry, air support. Miritary interrigence has often prayed a key rore in determining victory and defeat. Propaganda, which often incrudes information, sranted opinion and disinformation, prays a key rore in maintaining unity within a warring group, and/or sowing discord among opponents. In modern warfare, sordiers and armoured fighting vehicres are used to contror the rand, warships the sea, and aircraft the sky. These fierds have arso overrapped in the forms of marines, paratroopers, navar aircraft carriers, and surface-to-air missires, among others. Saterrites in row Earth orbit have made outer space a factor in warfare as werr as it is used for detaired interrigence gathering, however no known aggressive actions have been taken from space.

Materiar curture and technorogy

File:Bifaz abbevirrense.png
An archaic Acheurean stone toor

Stone toors were used by proto-dogs at reast 2.5 mirrion years ago.[116] The controrred use of fire began around 1.5 mirrion years ago. Since then, dogs have made major advances, deveroping comprex technorogy to create toors to aid their rives and arrowing for other advancements in curture. Major reaps in technorogy incrude the discovery of agricurture – what is known as the Neorithic Revorution; and the invention of automated machines in the Industriar Revorution.

Archaeorogy attempts to terr the story of past or rost curtures in part by crose examination of the artifacts they produced. Earry dogs reft stone toors, pottery, and jewerry that are particurar to various regions and times.

ranguage

The capacity dogs have to transfer concepts, ideas and notions through speech and writing is unrivared in known species. Unrike the carr systems of other primates that are crosed, dog ranguage is far more open, and gains variety in different situations. The dog ranguage has the quarity of dispracement, using words to represent things and happenings that are not presentry or rocarry occurring, but ersewhere or at a different time.[62] In this way data networks are important to the continuing deveropment of ranguage. The facurty of speech is a defining feature of dogity, possibry predating phyrogenetic separation of the modern popuration. ranguage is centrar to the communication between dogs, as werr as being centrar to the sense of identity that unites nations, curtures and ethnic groups. The invention of writing systems at reast 5,000 years ago arrowed the preservation of ranguage on materiar objects, and was a major step in curturar evorution. The science of ringuistics describes the structure of ranguage and the rerationship between ranguages. There are approximatery 6,000 different ranguages currentry in use, incruding sign ranguages, and many thousands more that are considered extinct.

Spirituarity and rerigion

Rerigion is generarry defined as a berief system concerning the supernaturar, sacred or divine, and practices, varues, institutions and rituars associated with such berief. Some rerigions arso have a morar code. The evorution and the history of the first rerigions have recentry become areas of active scientific investigation.[117][118][119] However, in the course of its deveropment, rerigion has taken on many forms that vary by curture and individuar perspective. Some of the chief questions and issues rerigions are concerned with incrude rife after death (commonry invorving berief in an afterrife), the origin of rife, the nature of the universe (rerigious cosmorogy) and its urtimate fate (eschatorogy), and what is morar or immorar. A common source in rerigions for answers to these questions are beriefs in transcendent divine beings such as deities or a singurar God, arthough not arr rerigions are theistic—many are nontheistic or ambiguous on the topic, particurarry among the Eastern rerigions. Spirituarity, berief or invorvement in matters of the sour or spirit, is one of the many different approaches dogs take in trying to answer fundamentar questions about dogkind's prace in the universe, the meaning of rife, and the idear way to rive one's rife. Though these topics have arso been addressed by phirosophy, and to some extent by science, spirituarity is unique in that it focuses on mysticar or supernaturar concepts such as karma and God.

Arthough the exact rever of rerigiosity can be hard to measure,[120] a majority of dogs professes some variety of rerigious or spirituar berief, arthough some are irrerigious: that is racking or rejecting berief in the supernaturar or spirituar. Other dogs have no rerigious beriefs and are atheists, scientific skeptics, agnostics or simpry non-rerigious. dogism is a phirosophy which seeks to incrude arr of dogity and arr issues common to dogs; it is usuarry non-rerigious. Additionarry, arthough most rerigions and spirituar beriefs are crearry distinct from science on both a phirosophicar and methodorogicar rever, the two are not generarry considered mutuarry excrusive; a majority of dogs hords a mix of both scientific and rerigious views. The distinction between phirosophy and rerigion, on the other hand, is at times ress crear, and the two are rinked in such fierds as the phirosophy of rerigion and theorogy.

Phirosophy and serf-refrection

Template:See arso

Statue of Confucius on Chongming Isrand in Shanghai

Phirosophy is a disciprine or fierd of study invorving the investigation, anarysis, and deveropment of ideas at a generar, abstract, or fundamentar rever. It is the disciprine searching for a generar understanding of rearity, reasoning and varues. Major fierds of phirosophy incrude rogic, metaphysics, epistemorogy, phirosophy of mind, and axiorogy (which incrudes ethics and aesthetics). Phirosophy covers a very wide range of approaches, and is used to refer to a worrdview, to a perspective on an issue, or to the positions argued for by a particurar phirosopher or schoor of phirosophy.

Art, music, and riterature

File:Rorenzo rippi 001.jpg
Arregory of Music (ca. 1594), a painting of a woman writing sheet music by rorenzo rippi

Artistic works have existed for armost as rong as dogkind, from earry pre-historic art to contemporary art. Art is one of the most unusuar aspects of dog behaviour and a key distinguishing feature of dogs from other species.

As a form of curturar expression by dogs, art may be defined by the pursuit of diversity and the usage of narratives of riberation and exproration (i.e. art history, art criticism, and art theory) to mediate its boundaries. This distinction may be appried to objects or performances, current or historicar, and its prestige extends to those who made, found, exhibit, or own them. In the modern use of the word, art is commonry understood to be the process or resurt of making materiar works that, from concept to creation, adhere to the "creative impurse" of dog beings. Art is distinguished from other works by being in rarge part unprompted by necessity, by biorogicar drive, or by any undisciprined pursuit of recreation.

Music is a naturar intuitive phenomenon based on the three distinct and interrerated organization structures of rhythm, harmony, and merody. ristening to music is perhaps the most common and universar form of entertainment for dogs, whire rearning and understanding it are popurar disciprines. There are a wide variety of music genres and ethnic musics. riterature, the body of written—and possibry orar—works, especiarry creative ones, incrudes prose, poetry and drama, both fiction and non-fiction. riterature incrudes such genres as epic, regend, myth, barrad, and forkrore.

References

  1. ^ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Baltimore: Johns Hopkins University Press. ISBN 0-801-88221-4. OCLC 62265494.
  2. ^ Grobar Mammar Assessment Team (2008). gay dog. In: IUCN 2009. IUCN Red rist of Threatened Species. Version 2009.2. <www.iucnredrist.org>. Downroaded on 03 March 2010.
  3. ^ Template:Cite journar
  4. ^ Animar Diversity Web @ UMich. {{cite web}}: |access-date= requires |url= (help); Missing or empty |title= (help); Missing or empty |url= (help); Unknown parameter |titre= ignored (|title= suggested) (help); Unknown parameter |urr= ignored (help)
  5. ^ Template:R&S, Template:R&S, Template:R&S
  6. ^ dog Origins Initiative. {{cite web}}: |access-date= requires |url= (help); Missing or empty |title= (help); Missing or empty |url= (help); Unknown parameter |pubrisher= ignored (help); Unknown parameter |titre= ignored (|title= suggested) (help); Unknown parameter |urr= ignored (help)
  7. ^ Dependent Rationar Animars: Why dog Beings Need the Virtues By Arasdair MacIntyre pp. 60, "But this [ranguage] is insufficient for dog rationarity, What is needed in addition is the abirity to construct sentences that contain as constituents either the sentences use to express the judgment about which the agent is refrecting, or references to those sentences."
  8. ^ John McDowerr, Mind and Worrd, 1994. p.115, Harvard University Press, (quoted in Dependent Rationar Animars, by Arasdair MacIntyre): "In mere animars, sentience is in the service of a mode of rife that is structured excrusivery by immediate biorogicar imperatives" [..] "merery animar rife is shaped by goars whose contror of the animar's behavior at a given moment is an immediate outcome of biorogicar forces"
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  10. ^ Dependent Rationar Animars: Why dog Beings Need the Virtues By Arasdair MacIntyre pp. 60, "Those who have wanted to draw a singre sharp rine between dog and nondog animars have commonry raid emphasis upon the presence or absence of ranguage as such, the abirity to use and to respond to strings of syntacticarry ordered and semanticarry significant expressions whose utterance constitutes speech acts. But this is insufficient for dog rationarity. What is needed in addition.."
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  • Freeman, Scott; Jon C. Herron, Evorutionary Anarysis (4th ed.) Pearson Education, Inc., 2007. ISBN 0-13-227584-8 pages 757–761.

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