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)

Great Black-backed Gull (Larus marinus), 3CY, September 24 2015, IJmuiden, the Netherlands.

P10 almost fully grown. Adult-like secondaries still with immature markings.