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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Sharks, like other fish, have their reproductive organs in their chests.
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The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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When cats are happy, they may squeeze their eyes shut.
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In 1918, a homing pigeon saved over 190 American soldiers by delivering a message to nearby support despite having been shot through the breast, blinded in one eye, covered in blood, and with a leg hanging on by just a tendon.
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Dogs have been man's pet for over 14,000 years.
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The two oldest cats on record lived to 38 and 34 years old, both were owned by the same owner and lived off a diet of bacon, eggs, broccoli and coffee.
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