Gulls in NW Europe
(last update: September 25, 2011
Herring Gull (argenteus) 2cy BTO GR?0814 November 28 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Probbaly GR20814. Much resembling 1cy birds, but note pale eye and chequered tertial centres and centres on central greater coverts.
