Penguins have a gland above their eye that turns saltwater into freshwater.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Dogs sometimes fake being sick to get attention.
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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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The Hercules beetle, despite weighing only 100 grams, can lift 8 kilograms, making it one of the proportionally strongest animals in the world.
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