Americans know about them mainly from a history of use as pack animals in Arizona and other areas of the desert Southwest.

VOA: special.2010.02.16

But burros are not only good pack animals.

VOA: special.2010.02.16

Eventually his production company decided to prioritise programming for dogs because they are pack animals and suffer most from separation anxiety.

BBC: New TV channel for dogs sets tails wagging in Israel

Schaller himself had attempted to find the calving ground a year earlier, but his trek failed when his pack animals died.

NPR: Chang Tang's Endangered Antelope

In the Middle Ages, European craftsmen refined the design, improving the efficiency and allowing pack animals to do more work with less strain.

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