Quote:
Originally Posted by LeisureChrist
If their offspring was only sterile as often as occurs in the general population for horses and asses, it would mean nothing. The FACT that the offspring of a horse and an ass is INVARIABLY sterile proves that they are the result of cross-breeding that is partailly successful.
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I don't believe it's invariably but that there's the very rare fertile mule.
wikipedia bears me out:
http://en.wikipedia.org/wiki/Mule#Fertile_mules