The males have a single pincer claw, which they wave constantly to attract females. When the tide comes in, Fiddler crabs go into their holes and plug the openings with a mud plug, thus staying relatively dry. These crabs are also spooky - to see them you must be still, or they will vanish into their holes. Hermit crabs live in discarded shells . As they grow, they outgrow the current shell and move to a larger one.
Hermit crabs are common on the beach.
Look in the opening and you will barely see its hard legs covering the opening and providing protection. Stone crabs are less common. They can grow up to five inches in width, and are reddish brown in color. They have two large, bulky claws, more like lobster claws. Stone crabs cannot be taken and are mentioned here only because their claws are powerful enough to inflict appreciable damage to a human finger.