Housefly is the common fly often found in houses. The Latin name for the housefly is "Musca domestica". This species is always found near humans. It is the most common species found on hog and poultry farms, horse stables and ranches. Not only are house flies a nuisance, but they also carry disease-causing organisms. Flies are not only an irritant to farm workers but may be a public health concern. Houseflies are pests and can carry diseases.