House flies are irritating because they are small flying objects that move around a lot. They are distracting, often catching our attention in our periphery or flying in front of the TV, computer, etc. read more
Fruit flies and house flies use a slightly different method: their mouthparts are like sponges, and they regurgitate a mixture of digestive enzymes onto the surface they’re feeding on and then lap up the resulting liquid. Although they are irritating, they don’t bite humans. read more