Great Black-backed Gull (Larus marinus)
(last update: October 12, 2011)
Great Black-backed Gull 3cy May
Under construction
Great
Black-backed Gull JH364 (Larus marinus) 3cy: May 11 2012, Boulogne/Mer, France. Picture: J-M Sauvage. 
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.
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.
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.
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.