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) sub-adult: January 13 2012, IJmuiden, the Netherlands.

In many respects adult bird especially regarding primary pattern, with only few indications of immaturity. Bird probably in 5cy, but difficult to exclude advanced 4cy birds.