Butterflies go through four stages duirng one life cycle. Those pictures above show the life cycle of 'Monarch Butterfly' which is Wiggly, the pink caterpillar is modelled on. The four stages of Monarch butterfly life cycle are the Egg, the caterpillar, the pupa and the adult butterfly.Wiggly, the pink caterpillar is the world's only doll that transforms itself into 3 different figures simply by turning it inside out. It can show the metamorphosis process of butterfly as if it really metamorphoses itself right in front of us.It has a great teaching effect and also children can gratify their curiosity about the life of butterfly through playing with this doll.