Pack animals are a group of animals that work together to carry heavy loads over long distances. The most common synonyms for pack animals include draft animals, beast of burden, work animals, burden bearers, and pack beasts. Draft animals are mainly large animals like horses, oxen, and buffalo that are trained and bred explicitly for hauling loads. Work animals, on the other hand, is a more general term used to describe a variety of animals like donkeys, llamas, camels, and elephants that help humans carry goods. Burden bearers and pack beasts are also used interchangeably with pack animals and refer to animals that carry items on their backs or carry luggage.