A male donkey is known as a ________.

A male donkey is known as a jack. This term specifically refers to the male of the donkey species, distinguishing him from other equines. In contrast, terms like stallion and colt are used for male horses, where a stallion is an uncastrated adult male horse, and a colt refers to a young male horse typically under four years old. A foal is a term that applies to a very young horse or donkey of either sex, usually one that is less than a year old. Therefore, in the context of donkeys, "jack" is the appropriate terminology to denote a male donkey.