Fly is a common Diptera insect. The scientific name "housefly" is small in size, with a body length of about 6-7mm, and the whole body is gray and black. The body is divided into three parts: head, chest and abdomen. The head has a pair of compound eyes and a pair of antennae. The compound eyes are composed of many small eyes, which can sense light and movement. The thorax has three pairs of feet and two pairs of wings, and the hindwings degenerate into balance bars to help maintain balance during flight. Living habits are complex and highly adaptable. It mainly feeds on decaying organic matter, garbage, feces, etc., and can also spread a variety of germs and parasites. Extremely strong reproductive capacity. Is considered to be an important vector of insects, can spread dysentery, cholera, typhoid and other diseases

It is a completely metamorphosed insect, whose life cycle includes four stages: egg, larva (maggot), pupae, and adult. Adult insects are 5-8 millimeters long, gray brown in color, and have significant identification features, such as four black vertical stripes on the back of the thorax. Living in areas rich in organic matter, the main food is liquid substances. Under suitable temperature and humidity conditions, it has strong reproductive ability and a short life cycle, completing one generation every 14-18 days. Not only is it a common hygiene pest, but it also has high economic value. Its larvae and adults can be used for feed, medicine, and ecological cycling.