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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There's a rare breed of pig that looks like a sheep.
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Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
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The seahorse is the only fish to have a neck.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The oldest recorded elephant lived for 82 years.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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