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)

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Great Black-backed Gull (Larus marinus) JH837 September & November 2010 & August 2012, Boulogne sur Mer, France (50.44 N - 01.35 E). 
Picture Jean-Michel Sauvage.

Bird ringed as pullus in Tue, Korsvikfjorden, Randesund, Kristiansand, Vest-Agder, Norway (58°07'29"N 008°03'02"E), ringed on June 25 2010.

25.06 2010 pull Tue, Korsvikfjorden, Randesund, Kristiansand, Vest-Agder, Norway 58°07'29"N 008°03'02"E
26.07 2010 Indre Grønningen, Kristiansand, Vest-Agder, Norway 58°05'43"N 008°05'32"E
22.08 2010 Le Portel beach, Pas-de-Calais, France 50°42'48"N 001°34'06"E
11.09 2010 Boulogne-sur-Mer harbour, Pas-de-Calais, France 50°43'34"N 001°35'04"E
20.09 2010 Boulogne-sur-Mer harbour, Pas-de-Calais, France
18.11 2010 Outreau, Pas-de-Calais, France 50°42'21"N 001°36'33"E
01.01 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France 50°43'34"N 001°35'04"E
07.01 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
16.01 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
21.01 2011 Boulogne-sur-Mer beach, Pas-de-Calais, France
01.02 2011 Outreau, Pas-de-Calais, France 50°42'21"N 001°36'33"E
10.02 2011 Outreau, Pas-de-Calais, France
24.02 2011 Outreau, Pas-de-Calais, France
12.04 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
15.05 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
08.09 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
10.09 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
30.10 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
19.11 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France
22.11 2011 Boulogne-sur-Mer beach, Pas-de-Calais, France
10.12 2011 Outreau, Pas-de-Calais, France 50°42'21"N 001°36'33"E
28.12 2011 Boulogne-sur-Mer harbour, Pas-de-Calais, France (photo)
04.04 2012 Dungeness, Kent, Great Britain 50°55'00"N 000°55'00"E
17.04 2012 Dungeness, Kent, Great Britain 50°55'00"N 000°55'00"E
28.08 2012 Boulogne-sur-Mer harbour, Pas-de-Calais, France.

below: JH837 3cy, August 28 2012, Boulogne sur Mer.

below: JH837 1cy, November 18 2010, Boulogne sur Mer.

Note how fast the scapular region has changed within a few months.

below: JH837 1cy, September 20 2010, Boulogne sur Mer.

Juvenile plumage.