A white crow (Image found on Google)
Most people - including me - think crows are black, and most are. A number of species in the genus Corvus, however, have extensive white in their plumage. The White-necked Raven, Corvus albicollis, of Africa, for example, has a white collar, and some other species have extensive white on other parts of their bodies as well. Even those species that normally are black may show patches of white on parts of their body, or may be completely white! The reasons for that may vary from several problems with pigment deposition to albinism.
~Ally
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