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)

gbbg rings
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gbbg 1cy August
gbbg 1cy September
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gbbg 2cy January
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gbbg 3cy January
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gbbg 3cy December

gbbg sub-ad January
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Great Black-backed Gull (Larus marinus) 4cy: February 02 2012, IJmuiden, the Netherlands.

Scapular region mixed with greyish black feathers and with several immature patterned feathers in this bird. Median coverts with 2nd gen pattern as well. 3rd gen primaries with white tips and large miror on P10. Bird close to most advanced 3cy birds.