Butterflies go through a “complete metamorphosis” where they hatch from their eggs as worm-like larvae (caterpillar) with mouthparts built for eating. They will eat and grow in size for a time and then cocoon themselves up to form a pupa. Inside their cocoon or chrysalis an insect will go through a complete physical change. When it comes out (emerges) from the cocoon it is an adult insect.
