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Horse Gene Map | ILAR Journal | Oxford Academic

The domestic horse belongs to the genus Equus, which is composed of 9 extant species including horses, donkeys, hemiones, and zebras ( Table 1 ). The horse evolved in North America approximately 3.5 to 5 million yr ago and migrated to the Asian/European continent across the Bering Strait before becoming extinct in the Americas between 20,000 and 10,000 yr ago ( Simpson 1951 ). The horses and donkeys populating North America today are descendants of those reintroduced from Europe, Africa, and Asia over the last 500 years.

Genus/species	Common name	Chromosome no. (2N)
Equus przewalskii	Mongolian wild horse	66
Equus caballus	Domestic horse	64
Equus asinus	Domestic ass/donkey	62
Equus hemionus onager	Persian wild ass	56
Equus hemionus kulan	Kulan	54/55
Equus kiang	Kiang, Asian wild ass	51/52
Equus grevyi	Grevy's zebra	46
Equus burchelli	Burchelli's zebra, common zebra	44
Equus zebra hartmannae	Hartmann's mountain zebra	32

Adapted from Lear 1997

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https://search.brave.com/search?q=wild+crossbreeding+zebras&summary=1

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• Chinese zoo accused of painting donkeys black and white to look like zebras: 'Stripes look a mess' [02/15/2025]