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) JT275 1cy: October & November 2014, Zandvoort-IJmuiden, the Netherlands. Picture: Martijn Los.

Ringed as pullus in 2014 in Norway.

below: Great Black-backed Gull (Larus marinus) JT275 1cy: November 02 2014, IJmuiden, the Netherlands. Picture: Johan Buijsman.

Compare scap moult to pictures from October: within 3 weeks most scaps replaced!

US: 75-99%, LS: 25-50%, TOT SCAPS: 50-75%. Tertials and coverts juvenile.

below: Great Black-backed Gull (Larus marinus) JT275 1cy: October 15 2014, Zandvoort, the Netherlands. Picture: Martijn Los.

US: 1-25%, LS: 0%, TOT SCAPS: 1-25%. Tertials and coverts juvenile.

below: Great Black-backed Gull (Larus marinus) JU818 1st cycle (1CY), October 08 2014, IJmuiden, the Netherlands. Picture: Martijn Los.

US: 0%, LS: 0%, TOT SCAPS: 0%.