The document describes the life cycle of a butterfly, which starts as an egg that hatches into a caterpillar. The caterpillar eats leaves as it grows and then forms a hard shell called a pupa. Inside the pupa, the caterpillar transforms into an adult butterfly, which emerges from the pupa. The life cycle of a butterfly involves complete metamorphosis, meaning the animal completely changes form during its development, unlike the incomplete metamorphosis of a chicken where it only changes in size as it grows.