The mantis shrimp is neither a mantis nor a shrimp, but it does wield perhaps the most stunning strike in the animal kingdom. Sitting below its face are two hammers, which the crustacean cocks back and launches at its prey with such speed that it shatters snail shells and tears crabs’ limbs right of their bodies. These things are ornery, and will even fight a human given the chance. For the mantis shrimp, the only tool they have is a hammer, and all the world looks like a nail.