Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Sloths take two weeks to digest their food.
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It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
The most expensive cow in the world was sold in 2009 for $1.2 million.
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Early American humans hunted car-size armadillos and used their shells for houses.
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