Great Black-backed Gull (Larus marinus)

(last update: October 12, 2011)

Coordinators:
Jean-Michel Sauvage (France)
Morten Helberg (Norway)
Nils Helge Lorentzen (Norway)
Mars Muusse (Netherlands)

Great Black-backed Gull (Larus marinus) 3cy: January 13 2012, IJmuiden, the Netherlands.

Note faint mirror on 2nd gen P10. Only few feathers in scapular region show adult-like greyish black colour. most still show internal pattern.