Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
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Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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The most expensive cow in the world was sold in 2009 for $1.2 million.
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