Are zebras and donkeys breeds of the equine kind?

[kerwin]

A zonkey born in a zoo reveals that interbreeding between donkeys and zebras can and does occur though their offspring are often infertile. That infertility functions to keep zebras and donkeys separate just like a dog breeder keeps two breeds of dogs separate though they are the same kind.

According to this article zebras and donkeys are know to crossbreed in the wild.

[Author]

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