Great Black-backed Gull (Larus marinus)

(last update: October 12, 2011)

Coordinators:
Jean-Michel Sauvage (France)
Morten Helberg (Norway)
Nils Helge Lorentzen (Norway)
Mars Muusse (Netherlands)

Great Black-backed Gull 4cy August

 

8418gbbgjb42.jpg (64101 bytes)Great Black-backed Gull (L. marinus) 4cy JB42 August 28 2003, IJmuiden, the Netherlands.
P4 fully grown, P8-P10 still old. Tail completely white.

8471j52c.jpg (85052 bytes)Great Black-backed Gull (L. marinus) 4cy JA112 August 18 2011, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) JH299 4CY August 18 2013, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
8011gbbg9158322.jpg (90352 bytes)Great Black-backed Gull (Larus marinus) JW209 2011, 2012 & 2013, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
8902j43a.jpg (64885 bytes)Great Black-backed Gull (L. marinus) 4cy J22Y August 23 2010, Boulogne-sur-Mer, France (50.42 N - 01.34 E). Picture: J-M Sauvage.

009e703.jpg (62935 bytes)Great Black-backed Gull (L. marinus) 4cy E703 August 12 2004, Westkapelle, the Netherlands. Ringed in 2001, isle of Terschelling, the Netherlands.

7095jp36.jpg (66909 bytes)Great Black-backed Gull (L. marinus) 4cy FF August 04 2006, Westkapelle, the Netherlands. Picture Corstiaan Beeke.
7647.jpg (66420 bytes)Great Black-backed Gull (Larus marinus) 1N4 4CY & 6CY, August 2010 & 2012, Sandy Point State Park. Picture: Suzanne Sullivan.
7647.jpg (66420 bytes)Great Black-backed Gull (Larus marinus) sub-adult: August 29 2012, IJmuiden, the Netherlands.

4wmaraug01.jpg (69389 bytes)Great Black-backed Gull (Larus marinus) sub-adult: August 2000, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).
Clearly an immature GBBG, which is replacing the greater coverts. Compared to 2nd calendar years, adults and near-adults are a few primaries behind in moult.

7642.jpg (63218 bytes)Great Black-backed Gull (Larus marinus) sub-adult: August 11 2003, Boulogne/Mer, France (50.42 N - 01.34 E).

7687.jpg (77008 bytes)Great Black-backed Gull (Larus marinus) sub-adult: August 11 2003, Boulogne/Mer, France (50.42 N - 01.34 E).

4wmaraug02.jpg (46407 bytes)Great Black-backed Gull (Larus marinus) sub-adult: August 2000, Etaples, France (50.34 N - 01.34 E).
Another individual showing the combination of adult-like blackish scapulars and barred coverts and tertials. Note the black markings on the bill.

4wmaraug03.jpg (34033 bytes)Great Black-backed Gulls (Larus marinus) sub-adult: August 2000, Etaples, France (50.34 N - 01.34 E).
Primary p7 almost fully grown and p10 still present.