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see equus.

Equus burchelli
common zebra.
Equus caballus
the modern horse.
Equus grevyi
Grevyi's zebra.
Equus przewalskii
Equus zebra
see zebra.


the final stage of the evolution of the horse. The evolution appears to have been direct beginning with Eohippus, through Miohippus and Merychippus to Pliohippus and finally to Equus.