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, August 15 2015, IJmuiden, the Netherlands.

P6/P8 (P6 just an inch longer than P5). Old 3rd gen P10 with obvious white mirror. Secs adult-type with blackish cetres. Few brown coverts, both on upper and underwing. Much black on bill.