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An order of mammals (class Mammalia) that includes the hippos, camels, deer, giraffe, pronghorns, and the buffalo. All have an even number of toes (2 or 4); that is, they have cloven hooves, a specialization that originally evolved for fast running. All are herbivarous. They are mostly of Old World origin and range in size from the 3.6-kg (8-lb) mouse deer to the 4.5-ton hippopotamus. Among the artiodactyls are to be found some of the most important domestic animals such as pigs, cattle, sheep, and goats. See also ungulate.

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