Most insects undergo this change, sometimes along with a change in habits and needs, to a greater or lesser degree, at some point in their lives. The change occurs during molting, when the exoskeleton becomes too small, splits, and is shed. These insects may have wings which, if present, develop externally. Young are known as nymphs and there is no resting stage. In these orders, the immatures or nymphs are known as naiads .
Naiads are aquatic and possess gills for breathing.
Nymphs and adults occupy different habitats and feed on different foods. Gradual Metamorphosis . Nymphs and adults live in the same habitat and feed on the same foods. In the case of pest insects, both nymphs and adults will have the same pest status. Inmature forms are known as nymphs .