How do you know if it’s an exoskeleton?

Have you ever found what you thought was a dead crab on the beach?  There is an easy way to tell if it’s dead or just an exoskeleton (a shedding).  One of our spider crabs molted recently and left behind its old shell.  The molt is hollow inside and the new crab is softer and larger.  Check back to see how our animals grow.