What is a male donkey called?

A male donkey is referred to as a "jack." This term is specific to male donkeys and is used in the context of equine terminology. Understanding this classification is important, especially in agriculture and animal husbandry contexts, where the proper terminology can affect breeding practices and communication among farmers and FFA members.

The other terms listed refer to different animals or categories: a "jennet" is a term used for a female donkey, while "filly" is specifically used to describe a young female horse. "Stallion" refers to an uncastrated male horse and not a donkey. Thus, "jack" is the accurate answer within the context of male donkeys.