two main physiological responses to low temperature are diapause and quiescence. diapause is a feature that insects use to synchronize their development within their life cycle with seasonal cycles of the environment. it has evolved to help insects respond to adverse environmental conditions by delaying their development. however, quiescence acts like an anesthetic, and stops insect development for a short time by slowing down insect metabolic activity. it is induced by a sudden drop in temperature that ranges from 0 °c to 10 °c. a simulation of insects chilling in a morgue was conducted by using "calliphora vicina" to illustrate that adult emergence is delayed by 24 hours, no matter in which stage the refrigeration occurred. there was no mortality when they were kept at 3 °c for 24 hours. in this simulation, quiescence was induced by the low temperature and the insect physiology was not affected when they were returned to 24 °c.