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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Cats sleep for 70% of their lives.
8
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11