Ctesias, a credulous Greek physician, who appears to have resided at the Court of Persia, in the time of the younger Cyrus, about 400 years before the birth of Christ, describes the wild asses of India as equal to the horse in size, and even larger, with white bodies, red heads, bluish eyes, and a horn on the forehead a cubit in length; the part from the forehead entirely white, the middle black, and the extremity red and pointed. Drinking-vessels were made of it, and those who used them were subject neither to convulsions, epilepsy, nor poison, provided that before taking the poison, or after, they drank from these cups water, wine, or any other liquor. Ctesias describes these animals as very swift and very strong. Naturally they were not ferocious; but when they found themselves and their young surrounded by horsemen, they did not abandon their offspring, but defended themselves by striking with their horns, kicking, and biting, and so slew many men and horses. This animal was also shot with arrows and brought down with darts; for it was impossible to take it alive. Its flesh was too bitter for food, but it was hunted for its horn and astragalus (ankle-bone), which last Ctesias declares he saw. Aristotle describes the Indian ass with a single horn. Herodotus mentions asses having horns; and Strabo refers to Unicorn horses, with the heads of deers. Oppian notices the Aonian bulls with undivided hoofs, and a single median horn between their temples. Pliny notices it as a very ferocious beast, similar in its body to a horse, with the head of a deer, the feet of an elephant, the tail of a boar, a deep bellowing voice, and a single black horn standing out in the middle of its forehead. He adds, that it cannot be taken alive; and some such excuse may have been necessary in those days for not producing the living animal upon the arena of the amphitheatre.