A pack animal or beast of burden is an individual or type of working animal used by humans as means of transporting materials by attaching them so their weight bears on the animal's back, in contrast to draft animals which pull loads but do not carry them.

Traditional pack animals are diverse, including camels, goats, yaks, reindeer, water buffalo, and llamas, as well as the more familiar horses, donkeys and mules.

https://en.wikipedia.org/wiki/Pack_animal

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Richard Feynman
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