Hoof

Tip of a toe of an ungulate mammal, strengthened by a thick and horny keratin covering

The hoof (pl.: hooves or hoofs) is the tip of a toe of an ungulate mammal, which is covered and strengthened with a thick and horny keratin covering. Hooves are present in some even-toed and odd-toed placental mammals, as well as in some nonmammalians. Artiodactyls (Ancient Greek: ἄρτιος : ártios "even", and δάκτυλος : dáktulos "toe") are even-toed ungulates, species whose feet have an even number of digits; the ruminants with two digits are the most numerous, e.g.

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