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) 3rd cycle (3CY), December 20 2014, IJmuiden, the Netherlands.

Adult like secondaries, adult like inner and central primaries. Still, many immature patterned coverts and less white in wing tip than full adults have.