The metamorphosis is the anatomy and habits change experienced by some animals during the course of his life. Among the species that develop in this way are most insects and frogs. Depending on each, there are insects that undergo metamorphosis. Among the former are the fly, the ant and the butterfly. The complete metamorphosis shows successive stages of transformation: the egg, which has a rugged housing with a weaker party where it exits the larva, the larva, which has no wings and the chest has six pairs of legs and usually grows rapidly the pupa or chrysalis, which is the state in which most processing occurs, and the adult insect or imago, with the final structure. The frogs, like the frog, develop from egg to tadpole comes out of it, which has a tail and gills to breathe, and live in the water. When the tadpole grows, gills and tail are resorbed by the body itself and form the lungs and legs. Finally, the animal leaves the water and lives on earth.
The butterfly undergoes changes with different aspects to reach the final form of the adult. The egg passes into larva, which has six pairs of legs; of the larva, pupa, through which the insect is seen in training, and then to adulthood.
Development begins with the first eggs, which are about half a millimeter in diameter. 15 days after the first larvae hatch, they feed and grow, and then a while enclosed in the cocoon to transform into pupae and emerge as adult.