Mrs. Watt's Science Class

A zeedonk (also spelled zedonk) (also known a zebrass, zebronkey, zonkey, zebadonk, zenkey or deebra) is an interspecies cross between a zebra and a donkey. The generic name for crosses between zebras and horses or asses is zebroid or zebra mule.
Donkeys are closely related to zebras and both animals belong to the horse family. Zeedonks are very rare. Usually a zebra stallion is paired with a horse mare or ass mare.
http://www.sciencedaily.com/articles/z/zeedonk.htm