The world's largest sea-dwelling crocodile, previously unknown to science has been discovered: This prehistoric crocodile is believed to have measured more than 30 feet long and weighed three tons. The skull alone is more than five feet long. Researchers named the new species the Machimosaurus rex.

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The world's largest sea-dwelling crocodile, previously unknown to science has been discovered: This prehistoric crocodile is believed to have measured more than 30 feet long and weighed three tons. The skull alone is more than five feet long. Researchers named the new species the Machimosaurus rex.