Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Dolphins have names for one another.
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Early American humans hunted car-size armadillos and used their shells for houses.
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Tigers can see 6 times better at night than humans.
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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
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
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