The most common fly is the house fly. It is black and about 1/4" inch long. The sex of a house fly can be determined by the distance between their eyes (females are wider). Also, the female is usually larger than the male.
Flies have been known to migrate up to 20 miles, although, typically they will stay within 1-2 miles from their release point or larval habitat. Flies are attracted to building or dwellings via air currents and odors with their preferred temperature being 83 degrees, on cooler days flies are usually found around doors and windows of dwellings.
During the day, flies will fly or rest less than 5 feet above ground, where at night tend to fly and rest above 5 feet. Flies have been known to harbor over 100 different diseases ranging from typhoid fever to salmonellosis.
Most infestations of flies can be controlled with Clark's Year Round Pest Control in conjunction with the treatment of any pests.