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You probably thought the winner in this category would be t-rex but it's now believed that Spinosaurus (which had a huge, crocodile-like mouth and a sail of skin jutting up from its back) was slightly heavier. It's possible that this dinosaur's sail evolved as a way of increasing its skin area, and hence allowing it to cool down faster--yet more evidence that Spinosaurus was the king of the meat-eaters.

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