Cluster Flies
Common Cluster Flies (Pollenia rudis), are generally similar in size, or slightly larger than a house fly, and have golden hairs on their thorax. Their wings fold over one another when resting. They may occur in large numbers “clustering” on windows.
Cluster Fly Habits
These flies do not generally breed indoors, rather they hibernate inside attics and wall voids during the winter months. They may become active in early spring, or on a warm winter day, and they will fly to windows and “cluster” there.
Questions To Ask About Cluster Flies
- How often do you see these flies?
- When do you usually start to see them?
- Is there access to your attic?
Cluster Fly Inspection Tips
Inspect carefully around windows, doors and along eave areas. Small access points can allow flies to enter the structure. Check above drop ceilings and in attics.
