When we think of an animal with humps, we immediately think of a camel. Often people assume a camel’s humps (or hump — dromedary camels have one hump, while the Bactrian has two) are filled with water, but in fact they are used for storing fat, which can be converted into a food source when supplies are low. But camels are not the only animals with this unique body feature. The American bison’s massive shoulder muscles give it a large shoulder hump to support its head and help control its movement. This enables the bison to use its head as a snow shovel in the winter to clear the snow. Similarly, the moose has a large shoulder hump also made from vertebrae muscle. Unlike the camel, this hump is not made of fat or used to house a back-up food supply. The white rhino has a hump at the back of its head that is used to support its hefty skull. This solid lump is made of thickened skin, fat and thick muscle and ligament. Studies have shown that a rhino’s hump also shrinks when food is scarce.