A camel stores fat in its hump, not water as is often believed.

The longer version

A hump is a reservoir of fatty tissue, and concentrating it in one place solves a thermal problem. Fat spread evenly under the skin would insulate the whole body and trap heat, while a single deposit leaves the rest of the surface free to shed warmth.

When food is scarce, the camel metabolises that fat, and the hump shrinks and may flop to one side. The reaction that breaks fat down also releases water as a by-product, which contributes to hydration without meaning the hump stores liquid. Water economy comes instead from other adaptations: oval red blood cells that tolerate dehydration, a tolerance for large swings in body temperature, and kidneys and intestines that recover moisture aggressively.

Where this entry sits

This collection gathers small surprises about mammals, reptiles, amphibians, birds, fish, insects, and the pets living alongside people. Expect odd details about senses, anatomy, and everyday behaviour that many people never notice in the animals around them. The full list sits on the Animals page, where every entry is listed in order.