High Quality Content by WIKIPEDIA articles! A pack animal is a beast of burden used by humans as means of transporting materials by attaching them so their weight bears on the animal's back; the term may be applied to either an individual animal or a species so employed. Many ungulate species are traditional pack animals, including elephants, camels, the yak, reindeer, goats, water buffalo and llama, and many of the domesticated Equidae (horse family). The term is not routinely applied to humans carrying loads on their backs except to make a pejorative point about the injustice of so employing them, or about the privation that usually occasions accepting such work without explicit coercion. (The 1978 Rolling Stones song Beast of Burden refers to a sense of abuse, accepted within a romantic relationship.)

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