A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Dogs have been man's pet for over 14,000 years.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Mosquitoes don't just bite you, they also pee on you.
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Sloths take two weeks to digest their food.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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