The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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The seahorse is the only fish to have a neck.
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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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Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
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The head of a jellyfish is called the "Bell."
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