Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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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 young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
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Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The ancestor of all domestic cats is the African Wild Cat which still exists today.
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