The housefly (Musca domestica) is a fly of the suborder Cyclorrhapha. It is believed to have evolved in the Cenozoic era, possibly in the Middle East, and has spread all over the world as a commensal of humans. It is the most common fly species found in houses. Adults are grey to black with four dark longitudinal lines on the thorax, slightly hairy bodies and a single pair of membranous wings. They have red eyes, set... (Wikipedia)

Musca autumnalis, the face fly or autumn house-fly, is a pest of cattle and horses. (Wikipedia)

The lesser house fly or little house fly, Fannia canicularis, is somewhat smaller (3.5–6 mm (0.14–0.24 in)) than the common housefly. It is best known for its habit of entering buildings and circling near the center of rooms. It is slender, and the median vein in the wing is straight. Larvae feed on all manner of decaying organic matter, including carrion. Among the Fanniidae, this species is the one most frequently associated with myiasis. (Wikipedia)