Camels are famous for being able to survive without water for a long time. Their one-two-one-can-give variety is dromedary, and now only domesticated populations can be seen in North Africa and the Middle East; The other is the two-humped camel, which is cultivated in Central Asia, western China and Mongolia, but there are also a few wild populations.

Then there are other genera and species of Camelidae, including four species of Camelidae in South America-wild alpacas and young alpacas, as well as domesticated alpacas and alpacas. Camels first appeared in North America about 40 million years ago, but disappeared in North America at the end of the Ice Age 10000 years ago. By this time, they have spread to other parts of the earth.

All camel animals are adapted to arid or semi-arid areas. The stomachs of complex three-chamber ruminants absorb the most nutrients from their staple food-grass. Their hooves are unique among hoofed mammals. Only the front edge of the hoof will touch the ground, and the weight of the body will be distributed on the hoof pad. The camel's hooves are wide, which enables it to walk on the soft beach without sinking.

Four South American breeds have narrow hooves and are suitable for stable walking on rugged slopes. Their thick double-layer body hair can insulate them from the cold.