Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Dolphins have names for one another.
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Penguins have a gland above their eye that turns saltwater into freshwater.
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The octopus does not have a blind spot.
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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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