I often come across this distinctive fly on my walks along a local woodland margin. They just enjoy chilling out in the warm sunshine, and they often gather in small groups to do so.
Also called ‘Attic Flies’, these flies are readily identified by their light grey and dark grey chequered patterning on their abdomens, and their golden coloured hairs on their thoraxes. Older inidviduals may lose some of these hairs. Length 10mm.
The larvae are parasites which develop inside earthworms.
Seen throughout the year in various habitats. The adults are more often seen in spring and summer sitting on vegetation, but they also appear in homes in late autumn, possibly many at one time hence their common name ‘Cluster Fly’. They will then hibernate throughout the winter in walls, attic spaces, and outbuildings. They may become a pest in some homes. Common and widespread throughout Britain.
Photographs of Common Cluster Fly (Pollenia rudis) taken June 2014, local woodland margin, Staffordshire. © Pete Hillman 2014. Camera used Nikon D3200, with Sigma 105mm macro lens.