There are three kinds of flies: Fruit flies, Cluster flies and Bottle flies. Fruit flies are yellow brown or dark brown in color and are of 1/8 inch long. They consider bins, fruits and vegetables as an ideal place. Cluster flies are 3/8 inch in size. They are found in residential areas and are really annoying. They are more active on warm days in winters. Bottle flies are of ¼ to ½ inch in size having metallic blue green appearance. They feed on decaying bodies of insects and rodents.