Only camels keep most of their fat in a hump. If food is hard to find, this fat provides it energy. When starving, its hump shrinks, may even slip off & hang down its side. After few weeks' rest & food, it becomes firm & plump again. It is not a storage place for water, as many people believe.

Oysters can change from one gender to another and back again depending on which is best for mating.

The moose has poor eye sight and relies on a keen sense of smell.

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