Lobsters are such amazing animals, they have the ability to regenerate legs, claws and antennae! In fact, they can amputate their own claws & legs to escape danger. While holding a lobster upside down is a good way to test its liveliness, it tends to make the lobster nervous – and a scared lobster is more likely to release a claw, resulting in a cull (a one-armed or armless lobster).