There are approximately over 100,000 species of flies in the world varying in size and color. The most common flies are the common housefly and the fruit fly. Other types of flies we typically see here in Wisconsin, especially during the summer and fall months would include drain flies, cluster flies, gnats, and blowflies.
Flies are not only annoying pests but they can also contaminate food. Flies feed on and breed in waste and filth which allows them to pick up bacteria that can transmit diseases. They are attracted to most human foods, especially sweet foods like fruits. Flies also reproduce quite rapidly, especially fruit flies and cluster flies.