The world's largest-ever scorpion wasn't tiny. It was bigger than humans and at one point in time, you could find it roaming the US.

Eurypterids, or sea scorpions, immediately caught paleontologist Richard Laub ... “I thought they were a combination fishing spear and can opener,” says Laub, now retired. “It seemed obvious.” But a ...

Still, next to nothing is known about most local scorpion species. During the Paleozoic Era, giant sea scorpions would have been the equivalent of a great white shark in their food web.