How many species are there of zebras?
* Plains Zebra (Equus burchelli) * Grant's Zebra * Crawshay's Zebra * Upper Zambezi Zebra * Chapman's Zebra * Damara Zebra * Burchell's zebra (extinct) * Quagga (extinct) * Grevy's Zebra (Equus greyvi) * Mountain Zebra (Equus zebra) * Cape Mountain Zebra * Hartmann's Mountain Zebra