Camels have humps on their backs which they use as places to store fat. It is this fat that these camels live off when food and water are quite scarce. A well-fed camel that is in good condition has a firm and upright hump. After a very long and exhausting desert journey, the same camel will possess a hump that is floppy and bent over to one side.
There are two types of camel. The camel with two humps is the Bactrian camel. It comes from Asia and carries loads across the cold high plains. The Arabian camel, or dromedary, has only one hump.