Metamorphosis is the process by which animals physically develop and change form, with 88% of insects undergoing complete metamorphosis through four stages - egg, larva, pupa, and adult. Complete metamorphosis is exhibited by butterflies, beetles, moths and flies, while 12% of insects like grasshoppers and dragonflies display incomplete metamorphosis. Some non-insects also metamorphose, such as frogs developing from eggs to tadpoles and then into adult frogs.