Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
During World War 1, starving wolves amassed in such great numbers that Germans and Russians had a temporary cease fire to fight off the wolf attacks.
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Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
It has been scientifically proven that stroking a cat can lower one's blood pressure!
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