According to wikipedia, A zonkey (also known as zebrass, zebronkey, zeass, zeedonk, zedonk, zebadonk, zenkey, donbra, donbri, donkra, zebrinny, zebrula, noochie, clive) is a cross between a zebra and a donkey. The generic name for crosses between zebras and horses or asses is zebroid or zebra mule. "Zonkey" is not the technically correct name for such a cross. The most commonly accepted terms are zebrinny, zebrula, and zedonk. Donkeys are closely related to zebras and both animals belong to the horse family. Zonkeys are very rare.
Breeding of different branches of the equine family, which does not occur in the wild, results in infertile offspring. The combination of sire and dam also affects the offspring. A zebrinny is the offspring of a male horse and a female zebra; a zebrula is the offspring of a male zebra and a female horse; a zedonk is the offspring of any zebra and any donkey.
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