The first man to swim the length of Great Britain grew a beard to stop jellyfish stinging his face.
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Jellyfish as a species are actually older than dinosaurs and sharks.
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The head of a jellyfish is called the "Bell."
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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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