Giant Ancient Sea Scorpion

OK, so scientists say it's been extinct for 250 million years, but this giant arthropod might still keep me out of large bodies of water for a long, long time.

British paleontologists announced that they had discovered the 18-inch-long fossilized claw of an ancient sea scorpion. The size of the claw suggests that the scorpion itself would have been about eight feet long.

Forget Jaws. This thing is much scarier. Lead scientist Simon J. Braddy of the University of Bristol says the scorpion was probably the lead predator in its environment, and would've eaten just about anything. But it probably wouldn't have spent too much time on land, if any at all, because it wouldn't have been able to support its own weight.—Gregory Mone