Immature insects are those that have not yet reached adulthood. They are in the process of metamorphosis, which is the transition from one life stage to another. Two examples of immature insects are pupae and LARVAE. Pupae are the stage between LARVAE and adult insects, and they are usually encased in a protective cocoon. LARVAE are the early stages of an insect's life cycle, and they often look like worms or caterpillars.