An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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Cats recognise the voice of their owner, but never evolved to care.
22
A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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Penguins have a gland above their eye that turns saltwater into freshwater.
12
The head of a jellyfish is called the "Bell."
6
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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