Ecdysis is the process of shedding the outer layer of skin or exoskeleton in arthropods (invertebrates with jointed legs and a hard exoskeleton). It is a term used to describe molting in animals like snakes, crustaceans, and butterflies. Butterflies go through a process known as complete metamorphosis, which means they undergo distinct stages of development, including egg, larva, pupa, and adult.
During the pupal stage of development, the butterfly undergoes ecdysis. The chrysalis or pupa is the hard, outer protective casing in which the caterpillar pupates, and after a few days, the pupa splits, an adult butterfly emerges. The adult butterfly's wings are at first crumpled and wet, and the butterfly will remain motionless while fluid is pumped into the wings, inflating them to their full size and hardening them before flying. Ecdysis is an essential step in the butterfly's life cycle, as it allows the butterfly to shed its old skin and emerge as a more advanced creature.