1. An order of hoofed mammals of the subclass Eutheria (including pigs and peccaries and hippopotami and members of the suborder Ruminantia) having an even number of functional toes.
2. The order of mammals that contains the even-toyed ungulates, in which the weight of the body is supported on the third and fourth digits only.

These large herbivorous mammals include sheep, goats, deer, domestic cattle, antelopes, pigs, camels, and giraffes.

The cud-chewing cloven-hoofed camels and ruminants have three or four chambers in the stomach, food being regurgitated from the first and chewed while the animal is resting before being swallowed again for complete digestion.