Insects who go through simple (or incomplete) metamorphosis have three life stages. These insects start as eggs, which are usually very small. When the egg hatches, a larva or nymph comes out. Nymphs are just baby insects. Most of the time, the nymph looks similar to the adult, but it is smaller, may have different colouration, and does not have wings. The nymph grows through stages called "instars", shedding its 'skin' ("epicuticle") at each stage ("ecdysis"). Finally, it changes into a mature adult with wings.