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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Great Black-backed Gull (Larus marinus) 4CY, September 20 2015, IJmuiden, the Netherlands.

P6/P10; P7 > P5. S1 fully grown, inner secs old, but already with adult-like pattern. Old P10 with large white tip. Still some brown coverts. Black on bill.