Herring or Great Black-backed Gulls Larus argentatus or marinus?


1cy Gull yellow right C5V18 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia, Koukkujärvi dump, SW Finland 21.10.2006. Foto: Hannu Koskinen


1cy Gull yellow right C5V18 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia, Koukkujärvi dump, SW Finland 21.10.2006. Foto: Hannu Koskinen


1cy Gull yellow right C5V18 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia, Koukkujärvi dump, SW Finland 21.10.2006. Foto: Hannu Koskinen


1cy Gull yellow right C5V18 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia, Koukkujärvi dump, SW Finland 21.10.2006. Foto: Hannu Koskinen


1cy Gull HT078617 Larus argentatus/marinus moulting to 1st-winter plumage.
Hämeenlinna Karanoja dump, SW Finland 24.8.2007. Foto: Hannu Koskinen


1cy Gull HT078617 Larus argentatus/marinus moulting to 1st-winter plumage.
Hämeenlinna Karanoja dump, SW Finland 24.8.2007. Foto: Hannu Koskinen


1cy Gull HT078617 Larus argentatus/marinus moulting to 1st-winter plumage.
Hämeenlinna Karanoja dump, SW Finland 24.8.2007. Foto: Hannu Koskinen


1cy Gull HT078617 Larus argentatus/marinus moulting to 1st-winter plumage.
Hämeenlinna Karanoja dump, SW Finland 24.8.2007. Foto: Hannu Koskinen


1cy Gull HT078617 Larus argentatus/marinus moulting to 1st-winter plumage.
Hämeenlinna Karanoja dump, SW Finland 24.8.2007. Foto: Hannu Koskinen


1cy Gull HT258708 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia Koukkujärvi dump, SW Finland 17.8.2005. Foto: Hannu Koskinen


1cy Gull HT258708 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia Koukkujärvi dump, SW Finland 17.8.2005. Foto: Hannu Koskinen


1cy Gull HT258708 Larus argentatus/marinus moulting to 1st-winter plumage.
Nokia Koukkujärvi dump, SW Finland 17.8.2005. Foto: Hannu Koskinen