Their special appendages are called “smashers” because they can smash things with their clubs. They use their clubs as fists, so they can knock out other animals by punching them. Basically, they use their punching skills to kill prey (live food). Since they mostly feed on crustaceans (hermit crabs, shrimps, etc.), their main goal is to destroy their outer shells so that they can gain access to the animals’ soft tissues and flesh.