It is one of the States in the metamorphosis of Lepidopterous Insects. Corresponds to the second stage or larval. The others are egg, pupa, pupa, and adult. They are usually soft and crawling. It is synonym of worm, larva and when they have hairs are told stuffed animals or you hipas. Caterpillar is also a metallic system of traction and locomotion of vehicles and heavy machinery. Traction chain or reel.