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 was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Mosquitoes don't just bite you, they also pee on you.
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The oldest creature ever found was Ming the clam at an admirable 507 years old.
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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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Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
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