Wing waving fly

Wing waving fly

Observation - Wing waving fly. Description: Small black flies around blackberry hedge. Seem to be waving/vibrating wings in a display. Also rub/clean wings frequently with hind legs, so maybe scent on them?

Small black flies around blackberry hedge. Seem to be waving/vibrating wings in a display. Also rub/clean wings frequently with hind legs, so maybe scent on them?