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) JE610 3cy, March 31 2011, Amsterdam - IJburg, The Netherlands. Picture: Jan Zorgdrager.

Note the more obvious pattern on mc, inner gc and upper tertials.