Early American humans hunted car-size armadillos and used their shells for houses.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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The cat brain weighs about 30g.
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Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
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The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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