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Cluster Flies

Size: 6-8mm

Colour: black

Cluster flies are noticeable around buildings in the spring and fall. If they have overwintered in your building you will see them clustering around the biggest and brightest windows. Since they think this is the way out they will spend all their time there. In the fall you will see similar activity, and also see them on the sunniest and warmest side of the exterior walls.

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