A 42-foot sperm whale has about 7 tons of oil in it.
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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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Cats recognise the voice of their owner, but never evolved to care.
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The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
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