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) adult: October 01 2001, Boulogne sur Mer, France (50.42 N - 01.34 E).

The tip of primary p5 equals the tip of p3 while p4 is fully grown. Note the missing greater coverts, exposing the secondaries underneath.