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) sub-adult: October 11 2011, Scheveningen, the Netherlands.

Slightly advanced 3cy or ordinary 4cy bird. Plumage development shows large variation in marinus, but clearly sub-adult bird.