By M Sprague Administrator From: New England Jun 11, 2013
Equus asinus, which is a donkey/burro/ass. Donkey and Burros (Spanish for donkey) are the same thing, though Burro is often used to distinguish small donkeys. I think Burro got to be used for small donkeys in the Americas because the Spanish brought over small ones on ships.
Jackass plus female horse = a mule. The other way doesn't work. Mules are sterile too.
Piper says he used to work in Tijuana but I think he is just telling stories.