Knowing what type of fly you're dealing with makes a real difference when it comes to pest control. Different fly species breed in different places, behave differently, and need different approaches to control. This guide covers everything you need to know: how to identify flies, where they live, what they eat, and what to do if you have a fly problem.
There are thousands of fly species in the U.S., but a handful show up in homes and businesses most often. Here's a quick guide to the most common types of flies:
This is the fly that most people will picture. The house fly has a gray body, is about 1/4 of an inch long, and has four dark stripes on the thorax and large reddish-brown compound eyes. They’re often found near garbage, pet waste, and exposed food.
Fruit flies are tiny — around one-eighth of an inch long — with a tan or light brown body. Most species have distinctive red eyes. Dark-eyed varieties also exist and tend to favor drains. If you're seeing small flies hovering around your kitchen, they're likely the culprits.
Cluster flies are larger and slower-moving than house flies, with a dark gray body and golden hairs on the thorax. They tend to appear in the fall, clustering in attics, wall voids, and around windows as they seek warmth for winter.
Drain flies are small, fuzzy, and moth-like in appearance. They’re usually gray or tan, and about one-eighth of an inch long with rounded, hairy wings. They’re found near sinks, floor drains, and anywhere with slow-moving or stagnant water.
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Understanding fly behavior is more useful than most people realize. Where a fly breeds, what it eats, and how quickly it reproduces all affect how a fly infestation develops.
Flies are found across the U.S. year-round, though activity usually peaks in warmer months. Most species prefer warm, humid environments with easy access to food and moisture. This makes them a particular concern in commercial settings. Where they set up depends on the species, though:
Flies have a varied diet which includes decaying food, animal waste, garbage, sugary liquids, and, in some species, blood. They can't chew solid food, so they liquefy it first by regurgitating digestive enzymes onto the surface before consuming it. It's as unpleasant as it sounds, and it's a big part of why flies are a contamination risk wherever food is present.
Flies develop through four stages: egg, larva (maggot), pupa, and adult. In warm conditions, house flies can complete this cycle in as little as seven to ten days. A single female can lay up to 500 eggs in her lifetime. This is exactly why a small problem can escalate fast if the breeding source isn't found and removed.
Behaviors depend on the species, but there are common traits to be found across species:
Flies don't always announce themselves in large numbers right away. Watch for these early warning signs:
Catching a fly problem early makes it much easier to manage. If you're seeing consistent activity, it's worth getting a free pest inspection to identify the source.
Flies don't bite (with a few exceptions like horse flies), but they can pick up bacteria and pathogens from garbage, animal waste, and decaying matter, then transfer them to food and surfaces in your home or business. Common house flies have been linked to the spread of illnesses, including Salmonella and E. coli. For businesses handling food, even a small fly problem can pose a serious hygiene and compliance risk. Contact our commercial pest services for more information.
Fly activity peaks in summer, but flies aren't strictly a warm-weather problem. Many species remain active indoors year-round, especially in heated buildings where food, moisture, and warmth are available. Cluster flies follow a more defined seasonal pattern, overwintering in wall voids and roof spaces before re-emerging in spring.
Thankfully, most common flies, like house flies and fruit flies, don't bite. However, some species do, including stable flies, horse flies, and deer flies, which feed on blood and can deliver a painful bite. If you're being bitten outdoors, especially near livestock or standing water, a professional fly control assessment can help identify the species and the source.
A sudden surge of flies usually points to a nearby breeding source. This could be anything from rotting food, a dead animal in a wall void, overflowing garbage, or a drain buildup. Blow flies and cluster flies can appear in large numbers seemingly out of nowhere. Finding and removing the source is the most important step; if you can't locate it, our technicians can.
There are thousands of fly species across the U.S., but the ones most likely to cause problems in homes and businesses include the house fly, fruit fly, blow fly, drain fly, cluster fly, and stable fly. Each species has different habits and breeding sites, which is why correct identification matters. Fly removal services that target the wrong source won't solve the problem.
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