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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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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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 Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


The earliest, primitive horse, included in the genus Hyracotherium; described as a small, four-toed species.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.