What is "hipparion"

Hipparion \Hip*pa"ri*on\, n. [NL., fr. Gr. ? a pony, dim. of ? a horse.] (Paleon.) An extinct genus of Tertiary mammals allied to the horse, but three-toed, having on each foot a small lateral hoof on each side of the main central one. It is believed to be one of the ancestral genera of the Horse family.

n. An extinct pony of the genus (taxlink Hipparion genus).

Hipparion (Greek, "pony") is an extinct genus of horse living in North America, Asia, Europe, and Africa during the Miocene through Pleistocene ~23 Mya—781,000 years ago, existing for 22 million years.

Its habitat or biome would be that of non-forested, grassy plains, shortgrass prairie or steppes.