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, July 30 2014, IJmuiden, the Netherlands.

Immature bird in complete moult: P4 new, P7-P10 old, old P10 with large mirror (indication for 4CY age). Old 3rd gen secondaries already adult-like. Active moult in other feather tracts as well, prominent in coverts which are replaced for fresh dark feathers.