Buffaloes and zebras occur in two or three varieties.
It can hardly be expected that zebras and bontequaggas fresh from their native mountains and plains can be brought into competition as beasts of burden and draught with horses and asses, whose useful qualities have been augmented by the training of thousands of generations of progenitors.
Among the striped species, or zebras and quaggas of Africa, the large Grevy's zebra (Equus grevyi) of Somaliland and Abyssinia stands apart from the rest by the number and narrowness of its stripes, which have an altogether peculiar arrangement on the hind-quarters, the small size of the callosities on the fore-legs, the mane extending on to the withers and enormous rounded ears, thickly haired internally.
Darwini to be the constant companion of guanacos (Lama huanaco) - just as in Africa the ostrich seeks the society of zebras and antelopes.
Though sometimes assembling in troops of from thirty to fifty, and then generally associating with zebras or with some of the larger antelopes, ostriches commonly, and especially in the breeding season, live in companies of not more than four or five, one of which is a cock and the rest are hens.
It is displayed to-day among the antelopes and to a limited degree among the zebras and rhinoceroses of Africa, a continent which exhibits a survival of the Miocene and Pliocene conditions of the northern hemisphere.
A few elephants, giraffes and zebras (equus burchelli - the true zebra is extinct) are still found in the north and north-eastern districts and in the same regions lions and leopards survive in fair numbers.