The wing-polymorphic cricket Gryllus firmus Zera & Denno, which is a model animal mode used for studying the physiological and biochemical mechanisms of wing polymorphism, has two types of wings in Adult. One is fully developed wings called long-wing crickets (LW), and another is incomplete developed wings dominated to short-wing cricket (SW). The LW adults on day 5 begin migration or flying, while the main characteristic on SW adults is reproduction. The flight-capable morph or LW cricket usually has fully-developed, pink flight muscles and small ovary which  is not development until flight stop (after day 10 of adulthood). The flightless morph or SW cricket has incomplete developed, white muscles, but fully developed ovary starting on day 4. The in-depth study at the mechanism of wing polymorphism could be conducive to understand the inherent mechanisms of migration and proliferation, it also provide important information to forecast its occurrence. The paper summarized the relationships between wing polymorphism and environment, as well as the effect of intermediary metabolism and endocrine regulation for the trade-off between flight capability and early reproduction. The genetic mechanism of wing polymorphism and the evolution significance were also discussed in this paper.
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