Donkey - World wide name for the ass family.
Jack, Jackass, Jack Ass - The male of the ass family, equis asinus.
Jennet or Jenny - The female of the ass family, equis asinus.
Burro - Small animals of the ass family from Mexican and Spanish stock, native to the Southwestern U.S. but not widespread.
Mammoth Jack or Jennet - Large animals of the ass family (14 hands or more), used for mule production. To call these animals a burro or donkey was considered an insult.
Hand - A measure of height for equines. A hand is equal to four inches.
Mule - A cross between a mule ass (jack) and a female horse.
Hinny - A cross between a stallion (horse) and a female ass (jennet).
Mule Colt - A mule under the age of one, male or female.
Mare Mule - This term was used exclusively by old-timers to describe a female mule over the age of one. If younger, it would be a “mare mule colt.” The term “Molly mule” is now commonly used.
Horse Mule - A male mule over the age of one, or a “horse mule colt” if younger. The term “John” or “Jack” are now used.
Mule Jump, Pages 24 on 10/06/2010