• Hybrids of asses and horses, such as mules and hinnies, are usually sterile, but possess high endurance and strength. Their speed is almost like that of a horse.

The species develops from an embryo for 1 year, and the female always carries a single offspring for about 1 year, giving birth to live young on land. A litter has 1 individual, and the foal is born sighted and can walk within an hour. The species inhabits and develops on land, outside of bodies of water, with nests built on or near the ground; these nests are located directly on the surface of the ground. Only the mother displays parental care for the young in these terrestrial nests. The species reaches maturity from 1 to 3 years of age, and the interval between reproduction is from 1 year to 1 year 6 months. Reproduction always occurs with fertilization, without any alternation of generations; this is a case of homogamy.