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A
zonkey 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.
more ->
http://en.wikipedia.org/wiki/Zonkey