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see horsehorse,
hoofed, herbivorous mammal now represented by a single extant genus, Equus. The term horse commonly refers only to the domestic Equus caballus and to the wild Przewalski's horse.
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a genus of primitive fossil mammals of the family Equidae. Eohippus, which lived in the early Eocene, measured approximately 0.5 m in length and had tetradactyl forehooves. The animal was similar to Hyracotherium. Remains of Eohippus have been found in deposits in North America.


The earliest, primitive horse, included in the genus Hyracotherium; described as a small, four-toed species.