The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
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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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There are approximately three chickens for every human on Earth.
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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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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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