A jackass is just a male donkey.
This derives from the male donkey's nickname "jack" paired with the original donkey terminology "ass." Female donkeys are called "jennies" or "jennets," but a female ready to breed is known as a "broodmare."
What is a female donkey called?
Jack: A jack is a term for a male donkey. Jenny: A jenny (or jennet) is a term for a female donkey.
What is the difference between a jackass and a mule?
As nouns the difference between mule and jackass
is that mule is a generally sterile male or female hybrid offspring of a male donkey and a female horse or mule can be a shoe that has no fitting or strap around the heel, but which covers the foot while jackass is a male donkey.
