Musca autumnalis, the face fly or autumn housefly, is a pest of cattle and horses. The face fly is similar to the closely related housefly but is slightly larger, averaging about 7–8 mm long and grey in colour with four dark stripes on the thorax, with a grey-black patterned abdomen.

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FLY IN THE FACE OF SOMETHING definition: 1. to completely oppose what seems sensible or normal: 2. to completely oppose what seems sensible…. Learn more.

Oct 27, 2021 · Native to Europe and Central Asia, face flies (Musca autumnalis De Geer, Diptera: Muscidae) were unintentionally introduced into North America and became pests of pastured beef cattle, dairy cattle, and horses.

Adults are gray to black, with four dark, longitudinal lines on the thorax, slightly hairy bodies, and a single pair of membranous wings. They have red compound eyes, set farther apart in the slightly larger female. The female housefly usually mates only once and stores the sperm for later use.

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Significance: Face flies feed on secretions around the faces of cattle and horses. They do not harm people and are only a nuisance when they cluster on the outside of buildings or get inside. They do not reproduce inside buildings. More information on Face fly

Face flies are generally found outdoors, usually around the eyes and nose of livestock . They only enter buildings during the fall to look for overwintering sites. Female flies feed on secretions from the wounds and orifices of cattle and horses.

The face fly is nearly identical in appearance to the house fly. They lay their eggs in cow manure. They are often seen on cows, they also are frequently seen in windowsills and light fixtures during warm days in winter.

Oct 12, 2023 · Usually 12-20 days depending on temperature (1); eggs and larvae develop in fresh (not crusted over) cattle dung; adults often overwinter in homes and other structures near pastures. In the summer, these flies feed on cattle; adult males feed on nectar.