Blue crab blues – when crabs fight, might makes right

Crustaceans are invertebrates and have skeletons that are on the outside. In order to gr…ow they have to molt or shed their exoskeleton. Before it can molt, the crab must create a new, soft, paper thin shell beneath the existing hard one. When the new shell is fully formed under the old shell, the crab stops eating and finds a safe place to begin molting.