I'm not sure what the verdict is on that theory. Either it is possible and never been tried, or not possible because of an evolutionary gap. Either way Snuzi explained it right, only animals from the same 'family' can interbreed. Large families such as a cats (Ligers are teh ownage), dogs and horses for instance.
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However, the consequences of the two animals mating is that the mule is rendered infertile, and cannot produce any offspring as a result.
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Actualy that is not always the case. Hybrid offspring isn't always by default infertile. Quite often the males are, but the females are mostly able to conceive from any fertile male.
Havoc