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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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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There are approximately three chickens for every human on Earth.
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Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
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The largest earthworm on record was found in South Africa and measured 22 feet.
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The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog. They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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