Flies is a type of insect from the order Diptera (derived from the Greek he means two and ptera means wings). The most obvious difference between flies and other insect orders is that flies have a pair of flying wings and a pair of halter, coming from the rear wing, on metastax except for some fly species that can not fly. The only other insect order that has two wings that actually function and has a dumbbell is Strepsiptera. However, unlike flies, the Strepsitera dumbbell is in mesotoraks and wings in the metastax. flies can also be expelled by doing with spray medicines such as baigon and other drugs