Drain flies (often called “moth flies” due to their fuzzy, moth-like appearance) often seem to mysteriously appear out of nowhere. In reality, however, drain flies breed in sewers, septic tanks, sewage treatment plants, and drains. Adult drain flies may become so numerous indoors that they congregate at windows, darken lamp shades at night, fall into food, and accumulate around showers, bathtubs, sinks, and floor drains, especially in basements or other areas with faulty plumbing or where the water has evaporated from the drain traps. Fruit flies tend to congregate around rotting or ripened fruit or other decaying vegetable matter. They often are found in kitchens, places where fruit or vegetables are stored, and around taverns and other areas where food and drinks are served. They can be readily distinguished from other small flies by their bright red eyes.