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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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
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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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When cats are happy, they may squeeze their eyes shut.
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