Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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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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The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
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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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