Cluster flies present no significant risk to health but can be a source of nuisance.
Their presence should not be taken as a sign of poor hygiene as they are simply seeking a warm place to hibernate. If they are not dealt with they are likely to return to the same place every year.
Adult cluster flie are around 10mm in length. They have one set of wings that are transparent, but show a distinct vein pattern.
The thorax (the middle section that the wings are attached to) have distinctive grey/olive coloured stripes and are covered in fine golden hairs. The abdomen (or the main body) is grey and has a chequer-board type pattern.
Cluster fly adults emerge from the ground in late summer/early autumn. They travel in large groups to find somewhere to hibernate and often settle for a roof void. It is because of this that they are sometimes known as attic flies. A large number of flies flying around the property or dead flies on window sills will be a good indication that a swarm has taken up residence.
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