Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
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Sharks, like other fish, have their reproductive organs in their chests.
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George was the world's largest dog who weighed 233 pounds, stood at 43 inches tall from paw to shoulder, and ate 180 pounds of food a month.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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