All the existing members of the family, such as the domesticated horse (Equus caballus) and its wild or half-wild relatives, the asses and the zebras, are included in the typical genus.
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.
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.
Pocock, " The Species and Subspecies of Zebras," Ann.
Darwini to be the constant companion of guanacos (Lama huanaco) - just as in Africa the ostrich seeks the society of zebras and antelopes.