Great Black-backed Gull (Larus marinus)

(last update: July 12, 2015)

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

Great Black-backed Gull (L. marinus) 7V2 4th pre-basic moult (4CY), September 04 2015, High Head, North Truro, Barnstable County, Massachusetts. Picture: Steve Arena.

Please visit Steve's Flick photostream excellent website for many more images! Banded as pullus on July 18 2012, at Appledore Island, York County, Maine USA. For more info about this project, see The Gulls Of Appledore blog.

Bird in complete moult: P9-P10 old 3rd gen primaries, P1-P6 new 4th gen primaries. Active moult in tail, with outer rectrices still old 3rd gen showing dark spotting. Adult-like old secondaries.