What is a cross between a jackass and a mare called?

A cross between a jackass (a male donkey) and a mare (a female horse) is known as a mule. Mules are recognized for their hybrid vigor, which often results in them being stronger, more durable, and possessing better stamina than either parent breed. They typically inherit the best traits from both donkeys and horses, making them highly valued in various agricultural and riding contexts.

The other terms mentioned refer to different hybrid combinations or equine classifications. A hinny, for example, is a cross between a stallion (male horse) and a jenny (female donkey), which is distinct from a mule. A foal is a general term for a young horse of either sex, usually under one year old, and a filly specifically refers to a young female horse. These definitions clarify the unique classification of the mule as the offspring of a jackass and a mare.