Great Black-backed Gull (Larus marinus)
(last update: July 12, 2015)
Great Black-backed Gull 3cy May
Great Black-backed Gull (Larus marinus) JC055 3CY, May 19 2017, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
Great Black-backed Gull (Larus marinus) JH364 3CY & 7CY, May 2012 & October 2016, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
Great Black-backed Gull (Larus marinus) JU779 2CY-3CY, September 2016 & May 2017, IJmuiden & Philipsdam, the Netherlands.
Great Black-backed Gull (Larus marinus) 1RM 3CY, May 20 2015, Clondalkin, Ireland. Picture: Graham Prole.
Great Black-backed Gull (Larus marinus) 1UK 3CY, April-May 2014, Howth, Ireland. Picture: Graham Prole.
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.