Early American humans hunted car-size armadillos and used their shells for houses.
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Gorillas can catch human colds and other illnesses.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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