1 cy. Yellow-legged gulls (L. michahellis). 26-09-09. Herring gull looking individual. In this case, judging the tail patter, the pale coverts seem to be related with any pigmentation problem. In addition, the inner primaries are really dark.
1 cy. Yellow-legged gulls (L. michahellis). 26-09-09. Individual ringed in southern France with pale primary window and overall dark appearance.