Fiddler crabs are just plain anti-social. At the drop of the tide, they are out looking for trouble. Armed with a single ‘Pop Eye’ - like pincer, which interestingly can appear as either left or right-handed protrusions. The strategy is to disarm the opponent as soon as possible. Once the oversized pincer has been amputated, the crab becomes completely defenseless and vulnerable. The amputee scuttles off to hide under a rock until a new defense mechanism has fully grown back.
