Jellyfish as a species are actually older than dinosaurs and sharks.
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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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There's a lizard known as the 'Jesus Lizard' that can run across water.
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On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
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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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