A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
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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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Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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