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) 1cy, December 15 2012, IJmuiden, The Netherlands.

1cy (right) and 2cy (left); note underwing coverts and tail pattern. Adult is referee.