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: February 02 2012, IJmuiden, the Netherlands.

Scapular region appears as greyish black saddle, but with several immature patterned feathers in this bird. Several median coverts adult-like as well. 3rd gen primaries with white tips and large miror on P10.