Zebroid

A zebroid is any hybrid of a zebra and another equine, such as a horse or a donkey. Scientists use it that broadly, while Merriam-Webster's narrower sense is a zebra stallion crossed with a horse mare. The common names follow the other parent: a zorse or zebrula is zebra and horse, a zonkey, zedonk or zebrass is zebra and donkey, and zony is an informal name for a zebra and pony cross. Zebroids exist only in captivity.

Zebroids are sterile. Zebras, horses and donkeys belong to one genus but carry different chromosome sets, from 32 in the mountain zebra to 62 in the donkey and 64 in the horse, so a hybrid's chromosomes cannot pair to make eggs or sperm. A zebroid is a first-generation cross, not a breed, and its zebra parent matters legally: plains zebras are not listed, while Grevy's and mountain zebras are listed under the US Endangered Species Act and CITES. USFWS guidance says captive-bred hybrids are not protected by the Endangered Species Act, but CITES applies to a hybrid with a listed zebra in its last four generations when it crosses a border, so keep breeding records. In Great Britain every zebroid needs a Dangerous Wild Animals license.

Colors: Bay with Stripes, Black with Stripes, Brown with Stripes