House fly
House fly The adult house fly ( Musca domestica ) is 6–7 mm long, yellowish-grey to dark grey in colour, with four narrow black stripes on the thorax, [...] originated in central Asia, the insect expanded its range worldwide long ago as a commensal organism to human populations; the housefly is always found in [...] in association with human activity. As the most common species of fly found on livestock farms, they represent both a nuisance and a risk for disease