Lots of different kinds of animals that live in the sea are called lobsters. When people talk about lobsters, most of the time they mean "clawed lobsters". One kind of clawed lobster is the American lobster. Lots of animals that we call lobsters are not actually "clawed lobsters". Squat lobsters, spiny lobsters or slipper lobsters, are all different kinds of animal. Some kinds of crayfish which live in fresh water and reef lobsters are very similar to "clawed lobsters".