Eohippus

Eohippus; Temporal range: early Eocene
	National Museum of Natural History, Washington, D.C.
Scientific classification
Kingdom:	Animalia
Class:	Mammalia
Order:	Perissodactyla
Family:	Equidae
Genus:	†Eohippus; (Marsh, 1876) Restoration by Heinrich Harder

Eohippus is small fossil proto-horse. It is an extinct genus of small equid ungulates.[1] The only species is E. angustidens, which was long considered a species of Hyracotherium. Its remains have been found in North America and date to the early Eocene (48–56 million years ago).[2]

Much of the evolution of the horse took place in North America. That is where horses originated, but became extinct there about 10,000 years ago.[3]

References

MacFadden B.J. 2005. "Evolution: Fossil horses--evidence for evolution. Science 307 (5716): 1728–1730.
Froehlich D.J. 2002. Quo vadis eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla). Zoological Journal of the Linnean Society 134 (2): 141–256.
Singer, Ben (May 2005). A brief history of the horse in America. Canadian Geographic Magazine. Archived from the original on 2012-01-07. Retrieved 22 December 2017.

Restoration by Charles Knight

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[1] MacFadden B.J. 2005. "Evolution: Fossil horses--evidence for evolution. Science 307 (5716): 1728–1730.

[Eohippus-2] Froehlich D.J. 2002. Quo vadis eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla). Zoological Journal of the Linnean Society 134 (2): 141–256.

[3] Singer, Ben (May 2005). A brief history of the horse in America. Canadian Geographic Magazine. Archived from the original on 2012-01-07. Retrieved 22 December 2017.