A male donkey is called a jack. Jacks are known for their strong build and endurance, making them valuable as working animals. They are often used for transportation, farming, and as pack animals in various regions around the world. Jacks typically have a braying sound that is distinct and can be heard from a distance. They are social animals and often live in herds. Male donkeys can also be bred with female horses to produce mules, which are known for their strength and stamina, combining traits from both the donkey and the horse.