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)

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gbbg 1cy August
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Great Black-backed Gull 4cy (Larus marinus) August 29 2012, IJmuiden, the Netherlands (52.27N - 04.33E).

Obvious sub-adult bird, with adult-like wing panel and old P10 with large mirror point to 4cy bird. Active complete moult, P8-P10 old 3rd generation, P5 fully grown (longer than P4).