Flies may be some of the most pesky or disgusting insects you can think of, but they may also me some of the most important. Some fly species rid us of other insect pests. Other flies are just plain pests themselves. Learn more about these friend-and-foe bugs in this intriguing book. The World of Insects series reveals the intriguing physical characteristics and behavior of some of our best-known insects. Each volume provides details about these creatures'...