Do House Flies Bite?

House flies possess straw-like (sponging) mouthparts used solely for lapping, sponging, and sucking when taking in food. Consequently, the house fly remains physically incapable of biting humans or animals, and its primary defense mechanism is to fly away at the hint of danger. While some of the pest’s relatives, such as the stable fly, possess the ability to bite, house flies pose greater health risks by carrying disease-causing bacteria on their hairy legs and bodies. By continuously feeding on dead and decaying organic matter, as well as human and animal feces, the house fly aids in spreading potentially harmful microorganisms, and people should avoid ingesting food contaminated by the pest.