Mules, hybrids between donkey and horse, are discussed in this section of Mammalian Hybrids.
Although mules can survive in a similar environment as donkeys, they do not have a natural environment since they are the offspring of a donkey mating with a horse. When in the wild, donkeys tend to form pairs or very small groups and can live in desert areas or areas with a limited food and water supply.
A zebroid (also zedonk, zorse, zebra mule, zonkey, and zebmule) is the offspring of any cross between a zebra and any other equine: essentially, a zebra hybrid. In most cases, the sire is a zebra stallion.