Dogs have been man's pet for over 14,000 years.
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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A cow produces around 200,000 glasses of milk in her lifetime.
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Two dogs were among the Titanic survivors.
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Sloths take two weeks to digest their food.
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Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
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