A pack animal, as its name suggests, is an animal that has been domesticated and trained to carry loads. The term is typically used to refer to working mammals like horses, mules, and camels. However, there are other terms that can be used to describe these animals, depending on their species and region. For instance, equines like horses, donkeys, and burros can be referred to as pack horses, pack mules, or pack burros. Similarly, llamas, alpacas, and yaks are considered pack animals in South America and Asia. Other terms that might be used include draft animals or working animals. Ultimately, the term pack animal is simply a convenient way to describe any animal that has been trained to carry a load.