The biggest feature of fiddler crabs is a pair of claws of different sizes. The big claws placed on the chest are like the shields of warriors. Fiddler crabs are called fiddler crabs because they can dance with big claws. The purpose of this "tidal wave" action is to intimidate the enemy with big claws, or to make love. English is called fiddler crab, because two pliers are also like violins. Only the male crab has big claws, while the female crab has small claws. In addition, fiddler crabs have matchstick-like eyes, which are very special.