I believe that I may have a new creature to add to my tall-tale creature gallery:
The Zonkey. It's a cross between a zebra and a donkey. Except it's real, so therefore it doesn't actually qualify for entry into the gallery. The zonkey's name is Alex, and he was born on Barbados. And exactly how did he get sired? Well, apparently there were only two zebras on this farm in Barbados, a male and a female. The male got sick, so the female "became friendly with a donkey". The result was Alex, the zonkey. They just had to name him Alex, didn't they. (thanks to Teddy for the link)
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I'm going off memory here, so my numbers may be off, I just remember asking these questions as we had a burro when were kids and were curious about equine reproduction.
If it's the other way around (which seems to be a much rarer occurrence), you're a hinny.
Jackasses can't be mothers for the same reason roosters don't lay eggs (with a few possible kinky exceptions).