Why does an insect moult?
it gets too big for the external skeleton
The life cycle of a stick insect is fairly simple: Nymphs that have hatched out of eggs resemble their parents, minus any wings or reproductive organs. Nymphs molt about 6 times as they grow to become adults. These "stages" are called Instas. With each moult the nymphs grow and older nymphs are often big and developed enough to determine its gender. Their final moult into an adult will include wings (if that particular species has…
An immature cricket is called a nymph, as are some other invertebrate insects. Nymphs look very similar to their adult forms and instead of entering a pupal stage (a cocoon is an example of a pupa), they moult (shed their exoskeleton) and the last moult produces an adult insect. Some aquatic insects, dragonflies for example, also produce young who do this. They're called naiads, which was the name for water nymphs in Ancient Greek mythology.