A "pack animal" refers to an animal that is trained to carry loads or transport goods. Common examples include donkeys, mules, and horses. These animals are often used in various settings, such as agriculture, trade, and exploration, where they help humans move supplies over difficult terrain. Pack animals are valued for their strength, endurance, and ability to navigate challenging environments. They can carry heavy burdens over long distances, making them essential in regions where vehicles cannot easily travel. Their use has been crucial in many cultures throughout history, facilitating trade and communication.