Jellyfish as a species are actually older than dinosaurs and sharks.
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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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15% of snails survive digestion by birds and are found alive in their droppings, potentially leading to the spread of snail populations.
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Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
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Sloths take two weeks to digest their food.
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Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
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