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) 3CY, August 21 2015, Katwijk, the Netherlands.

P5/P7 (P6 visible); unusual small moult gap for this species. Old 2nd gen secs are brownish, faded. Old 2nd gen tail. Restricted moult in coverts, considering this primary moult stage.