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Hoof
horn structure which surrounds the distal phalange in odd-toed ungulates (horses, donkeys and zebras) / From Wikipedia, the free encyclopedia
A hoof is the foot of certain animals known as ungulates (such as deer, cows, pigs, sheep, and giraffes). These animals walk on their toes. The toes have a hard cover made out of the same material as fingernails. This is called keratin.
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