The Terminator

Mantis shrimp may be called shrimp, but they are really only distant relatives. These vicious predators can grow to be up to a foot long. Some species of mantis shrimp have razor-sharp claws that resemble a swithblade and can slice a fish in tow-or cut a human hand to the bone-in less than a second. Othre species have a club-shaped front leg that they use to smash open the shells and snails. In April 2004, researchers filmed a peacock mantis shrimp repeatedly hitting a tegula snail with its club and were able to measure the incredible speed and force it used.