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) 2CY, July 30 2014, IJmuiden, the Netherlands.

Bird in complete moult: P6/P10. All coverts replaced for 2nd gen feathers (except maybe some very small lesser coverts in the carpal edge). Active moult in tail: central rectrices replaced, several growing.