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 3cy May

Under construction

 

1598.jpg (74227 bytes)Great Black-backed Gull JH364 (Larus marinus) 3cy: May 11 2012, Boulogne/Mer, France. Picture: J-M Sauvage.
gbbg3cy579.jpg (69766 bytes)Great Black-backed Gull (Larus marinus) 3cy: May 17 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E). A bird which is actively moulting the median and lower lesser coverts. Note the rounded second generation primaries.
gbbg3cy590.jpg (62608 bytes)Great Black-backed Gull (Larus marinus) 3cy: May 17 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E). Two images. A bird with more advanced bill coloration. Note the hint of a pale mirror on the rounded second generation p10 primary.
gbbg535.jpg (67274 bytes)Great Black-backed Gull (Larus marinus) 3cy: May 17 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E). One median covert is obviously different patterned and look fresh black. The same can be seen in the scapulars, where upper lower scapulars and lower upper scapulars are adult-like black.
gbbg538.jpg (50192 bytes)Great Black-backed Gull (Larus marinus) 3cy: May 17 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E). A very powerful and dominant GBBG, most probably a male. In this bird, inner and outer median coverts have been replaced for blackish feathers and probably the two tracts will meet at the central coverts, creating a solid dark bar.