·Medium-sized flies about 1/4-inch in length.

·Dark gray; four stripes are present on top of the thorax in front of the wings.

The house fly is the most common and ubiquitous fly on the planet, being found everywhere humans are found except possibly the coldest reaches of the Arctic and Antarctic. Because it frequents unsanitary areas, such as garbage and manure, this fly is considered a possible health risk and its presence indoors should be minimized. This species has sponging mouth parts so it cannot eat solid food. It regurgitates digestive fluids onto its food and then sponges up its digested liquid meal.