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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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
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When cats are happy, they may squeeze their eyes shut.
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