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
gbbg 1cy October
gbbg 1cy November
gbbg 1cy December

gbbg 2cy January
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gbbg 3cy January
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gbbg 3cy May
gbbg 3cy June
gbbg 3cy July
gbbg 3cy August
gbbg 3cy September
gbbg 3cy October
gbbg 3cy November
gbbg 3cy December

gbbg sub-ad January
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Great Black-backed Gull 3cy (Larus marinus) August 29 2012, IJmuiden, the Netherlands (52.27N - 04.33E).

Obvious sub-adult bird, with adult-like wing panel but old P10 point to 3cy bird. Last phase of complete moult, P10 old second generation with small mirror, P7 fully grown. New tail with black barring. Obvious black line on bill. see for a 4cy from this date: HERE.