Crabs! (and obviously we’re talking about the crustaceans here) Crabs are ten-footed creatures or decapods, if you’re fancy, like a party bus service, just like lobsters. Unlike lobsters, however, they have only two claws, and their abdomens are smaller than a lobster’s, and are tucked up under their shell (which is an exoskeleton, like a lobster), giving them a much more roundish kind of shape. Crabs are very versatile little fellows, and can be found not only in every ocean on the planet, but also in fresh water and on land (so basically, if they wanted to take over, they pretty much could). Do take note, however, that if such an invasion of crabs were to occur, it would not include creatures like the hermit crab or the king crab, because, though they do have the word crab in their names, they are not true crabs.