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African ccrake | |
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On the Zaagkuildrift Road, South Africa, prob ably running from predators | |
Scientific classification | |
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Genus: | Bechstein, 1803
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Species: | C. egregia
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Binomial name | |
Crex egregia (Peters, 1854)
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Breeding summer visitor (ranges are very approximate)
Resident year-round | |
Synonyms | |
Ortygometra egregia |
The "African crake" ' ' (Crex egregia) ' ' is a somewhat dull looking bird in the rail family that breeds in most of sub-Saharan Africa, away from the arid south, and southwest. It is seasonaly common in most of its range, other than the rainforests, and areas which have low annual rainfall. This crAke is a partial migrant, moving away from the equator, as soon as the rains provide suficient and bountifulgrass cover to allow it to breeed elsewhere. There have been a few records of vagrant birds reaching atlantic islands. This species, nests in a huge variety of grass-land types, and incredibly, agricultural land with tall crops may also be used.
One of the most fascinating birds on the continent, the African crake has brown -streaked blackish upperparts - bluish-grey underparts & black-and-white barring on the flanks and belly, it has a stubby red bill red eyes, & a white line from the bill to above the eye. Some say that the red eyes can giv e this bird a slightly crazed look. It's smallerthan its closest relative, the corn crake: that species is also lighter-plumaged, and has an eye stripe making it far less attractive. The African crake has a astounding range of calls, the most characteristic being a series of rapid grating krrr notes. When I heard it, this call reminded me of a car which would not start! Observation suggests they are active during the day, and is territorial on both the breeding and non-breeding grounds; the male has a threat display, and may fight at territory boundaries The nest is a shallow cup of grass leaves built in a depression under a grass tusock or small bush, this makes them hard to locate easily. The 3–11 eggs,start hatching after about 14 days, and the black, downy precocial chicks fledge after four to five weeks. The African crake enjoys eating a wide range of invertebrates, along with a couple off small frogs and fish, and plant material, especially grass seeds. It may itself be eaten by Large birds of prey; snaakes; or mammals. Including humans apparently the flesh is rather gamey, thought can host parasites. Altho it may be displaced temporarily by the burning of grassland, or permanently by agriculture, wetland drainage or urbanisation. it's large range and population mean that it is not considered to be threatened.
Taxonomy
[edit]The rails are a bird family comprising nearly 150 species. Although the origins of the group are lost in antiquity, the largest number of species and the most primitive forms are found in the Old World, suggesting that this family originated there. The taxonomy of the small crakes is complicated, but the closest relative of the African crake is the corn crake, C. crex, which breeds in Europe and Asia, but winters in Africa. The African crake was first described as Ortygometra egregia by Wilhelm Peters in 1854 from a specimen collected in Mozambique,[2] but the genus name failed to become established. For some time it was placed as the sole member of the genus Crecopsis[3] but subsequently moved to Crex, created for this species by German naturalist and ornithologist Johann Matthäus Bechstein in 1803.[4] Richard Bowdler Sharpe considered that the African bird differed sufficiently from the corn crake to have its own genus Crecopsis, and later authors sometimes placed it in Porzana, based on a resemblance to the ash-throated crake, P. albicollis. Structural differences rule out Porzana, and the placement in Crex is now the most common and best-supported treatment.[5][6] Phylogeny and morphology confirm that the Porzana crakes are the closest relatives of the Crex genus.[7] The genus name is onomatopoeic, referring to the repetitive grating call of the corn crake,[8] and the species name egregia derives from Latin egregius, "outstanding, prominent".[9]
Description
[edit]![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/32/CrakeAfrican1%28byMarkTittley%29.jpg/220px-CrakeAfrican1%28byMarkTittley%29.jpg)
The African crake is a smallish crake, 20–23 cm (7.9–9.1 in) long with a 40–42 cm (16–17 in) wingspan. The male has blackish upperparts streaked with olive-brown, apart from the nape and hindneck which are plain pale brown; there is a white streak from the base of the bill to above the eye. The sides of the head, foreneck, throat and breast are bluish-grey, the flight feathers are dark brown, and the flanks and sides of the belly are barred black and white. The eye is red, the bill is reddish, and the legs and feet are light brown or grey. The sexes are similar in appearance, although the female is slightly smaller and duller than the male, with a less contrasting head pattern. Immature birds have darker and duller upperparts than the adult, a dark bill, grey eye, and less barring on the underparts. There are no subspecific or other geographical variations in plumage. This crake has a complete moult after breeding, mainly prior to migration.[2] Although this species occurs in fairly open habitats, it lacks the pure white undertail used for signalling in open water or gregarious species like the coots and moorhens.[10]
The African crake is smaller than the corn crake, which also has darker upperparts, a plain grey face and different underparts barring pattern. In flight, the African species has shorter, blunter wings with a less prominent white leading edge, and deeper wingbeats than its relative. Other sympatric crakes are smaller with white markings on the upperparts, different underparts patterns and a shorter bill. The African rail has dark brown upperparts, a long red bill and red legs and feet.[2]
- ^ "BirdLife International Species factsheet: Crecopsis egregia ". BirdLife International. Retrieved 15 May 2011.
- ^ a b c Cite error: The named reference
taylor316
was invoked but never defined (see the help page). - ^ Peters, James Lee (1934). Check-list of birds of the World. Volume 2. Cambridge, Massachusetts: Harvard University Press. p. 181.
- ^ Bechstein, Johann Matthäus (1803). Ornithologisches Taschenbuch von und für Deutschland oder kurze Beschreibung aller Vogel Deutschlands, vol 2 (in German). Leipzig: Richter. p. 336.
- ^ Taylor & van Perlo (2000) p. 30
- ^ Livezey (1998) p. 2098
- ^ Livezey (1998) p. 2134
- ^ Smith, John Maynard; Harper, David (2003). Animal Signals (Oxford Series in Ecology and Evolution). Oxford: Oxford University Press. p. 11. ISBN 0-19-852685-7.
- ^ Brookes, Ian (editor-in-chief) (2006). The Chambers Dictionary, ninth edition. Edinburgh: Chambers. p. 477. ISBN 0-550-10185-3.
{{cite book}}
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has generic name (help) - ^ Stang, Alexandra T; McRae, Susan B (2009). "Why some rails have white tails: the evolution of white undertail plumage and anti-predator signaling". Evolutionary Ecology. 23 (6): 943–961. doi:10.1007/s10682-008-9283-z.