At about 9mm long, the cluster fly is slightly larger than the common house fly. The female lays eggs in the soil near the burrows of earthworms. The tiny maggots that hatch from the eggs seek out earthworms to feed upon. As cold weather progresses, adults seek protected places to spend the winter, particularly during September and October (activity can often be noted again in early spring). In many cases the flies seek shelter within walls, roof voids and attics, usually returning to the same building year after year and often favouring south facing buildings.

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