Why do crustaceans molt?
The molting process of crustaceans is called ecdysis. It becomes necessary as the crustacean grows because his exoskeleton can no longer contain his new size.
Unlike mollusks and crustaceans, Hermit Crabs do not produce their own shells. In the wild, they would find abandoned shells on the seafloor, and wiggle into those, so you must provide a constant stream of larger and larger shells as they grow. When they molt, they shed their EXOSKELETON, not their SHELL.
Chickens raised naturally will being their molt after their first year. If for example a chick hatches out this June, it will not go through its first molt until the fall of next year, usually starting around September or October. Then it will molt every fall after. Chickens raised in commercial layer houses will be forced into molt whenever the manager of the house wants them to molt, usually when their egg production drops.