Great Black-backed Gull (Larus marinus)

(last update: July 12, 2015)

Coordinators:
Jean-Michel Sauvage (France)
Morten Helberg (Norway)
Nils Helge Lorentzen (Norway)
Mars Muusse (Netherlands)

Great Black-backed Gull (L. marinus) 7F8 7th pre-basic moult (7CY), July - September 2015, Barnstable County, Massachusetts. Picture: Steve Arena.

Please visit Steve's Flick photostream excellent website for many more images! Banded as pullus on July 10 2009, at Appledore Island, York County, Maine USA. For more info about this project, see The Gulls Of Appledore blog.

below: Great Black-backed Gull (L. marinus) 7F8 7th pre-basic moult (7CY), September 26 2015, Race Point, Barnstable County, MA. Picture: Steve Arena.

Bird in complete moult: P7 fully grown.

below: Great Black-backed Gull (L. marinus) 7F8 7th pre-basic moult (7CY), August 28 2015, High Head, North Truro, Barnstable County, Massachusetts. Picture: Steve Arena.

Bird in complete moult: P8-P10 old primaries, P1-P5 new primaries.

below: Great Black-backed Gull (L. marinus) 7F8 7th pre-basic moult (7CY), July 31 2015, Race Point, Provincetown, Barnstable County, Massachusetts. Picture: Steve Arena.

Bird in complete moult: P6-P10 old primaries.