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10 animals with unusual color mutations

By: Bryan Nelson on Aug. 11, 2016, 10:23 a.m.
black penguin

Photo: National Geographic/YouTube

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Black penguin

This all-black penguin is such a rare sight that it has been called "one in a zillion." Filmed by National Geographic contributor Andrew Evans on the sub-Antarctic island of South Georgia, it is the only all-black penguin ever witnessed. Scientists suspect the coloration is due to a condition called melanism, which is the opposite of albinism. Rather than lacking pigmentation, melanistic animals have dark spots which cover the body.