A shark always has a row of smaller teeth developing behind its front teeth. Eventually the smaller teeth move forward, like a conveyor belt, and the front teeth fall out.

Giraffes have bluish-purple tongues which are tough and covered in bristly hair to help them with eating the thorny Acacia trees.

You may have seen baby gorillas being carried on the back of their mothers, but for the first few months after birth the mother holds the baby gorilla to her chest.

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