A donkey is a four-legged domesticated farm animal with hooves that's related to the horse. Donkeys are known for the braying sound they make and their long ears.
Farmers often keep donkeys for pulling carts, carrying heavy loads, or even for guarding flocks of sheep. In some places, donkeys are ridden like horses or kept as calming companions for nervous horses. The word donkey was first used as slang for the animal then only called an ass. It was probably modeled after monkey, with which it originally rhymed, from dun, or "a grayish brown color."