Equus (genus) a female horse. With rare exceptions, these hybrids are sterile and cannot reproduce. A related hybrid, a hinny, is a cross between a male horse and a female donkey. Other hybrids include the zorse, a cross between a zebra and a horse and a zonkey or zedonk, a hybrid of a zebra and a donkey. In areas where Grévy's zebras are sympatric with plains zebras, fertile hybrids do occur. Equines have significant differences in size, though all are characterized by long heads and necks. Their slender legs support their weight on one digit (which evolved from the middle digits). Grévy's
The Horse and the Donkey the Ass". This begins with the moral that is usually put into the mouth of the remaining animal in Classical versions: Illustrations from books from the 15th - 19th centuries The Horse and the Donkey The Horse and the Donkey is a variant of a fable type recorded since antiquity of which there is scarcely one version that concerns the same pair of animals. Included as one of Aesop's Fables and numbered 181 in the Perry Index, its Greek sources also include a donkey and a mule, while the story is told of an ox and a donkey in the