Any domesticated animal trained to perform tasks for humans, such as a herding dog or trained falcon.
A draught animal, such as a donkey, mule, llama, camel, horse, or ox, that carries or pulls a load for the benefit of a human.
An animal of the class Mammalia, characterized by being warm-blooded, having hair and producing milk with which to feed its young.
A vertebrate with three bones in the inner ear and one in the jaw.