A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
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It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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