English: A Helmet urchin (Colobocentrotus atratus) within a tide pool near the Hālona Blowhole on Oahu, Hawaii. Also seen are Green feather algae (Caulerpa sertularioides), Scroll algae (Padina sp.), Sargasso (Sargassum sp.), and a Pale rock-boring urchin (Echinometra mathaei).
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