The housefly has a worldwide distribution, being the most common diptera in many regions of the Earth. It is a large fly about 8 millimeters in size, with a gray thorax and four darker longitudinal lines. The abdomen is yellowish. The large compound eyes are red, and are more separated in females than in males. The housefly can transmit numerous infectious diseases to man, as it perches on the droppings and then can deposit bacteria and other agents on the skin pathogens In addition, the larvae can accidentally parasitize any warm-blooded animal, producing a miasis.