Butterflies are an order of insects known as lepidoptera, which go through a complete metamorphosis as part of their development. The word metamorphosis comes from the Greek («meta», change and «morfe», form) and means "transformation". The metamorphosis is not exclusive to butterflies, but also occurs in many other insects, mollusks, amphibians, crustaceans, echinoderms, etc ... humans also suffer from time to time some, and we should not fear it ... ever!