Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Only 3% of bird species have penises.
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The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
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Vanilla flavoring is sometimes made with an ingredient from beaver pee.
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Bats sleep 18-20 hours per day.
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