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, December 15 2012, IJmuiden, The Netherlands.

Large mirror on P10, but immature patterns on lesser coverts and central greater coverts. White tail. Much black on bill.