Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Elephants are among the most emotional creatures in the world - they have even been known to rescue other animals, such as trapped dogs.
25
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
Snails breathe through their feet.
34
Cattle are the only mammals that pee backwards.
33
A crocodile cannot stick out its tongue.
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If NASA sent birds into space they would soon die; they need gravity to swallow.
146
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23