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
gbbg PDF's

gbbg 1cy August
gbbg 1cy September
gbbg 1cy October
gbbg 1cy November
gbbg 1cy December

gbbg 2cy January
gbbg 2cy February
gbbg 2cy March
gbbg 2cy April
gbbg 2cy May
gbbg 2cy June
gbbg 2cy July
gbbg 2cy August
gbbg 2cy September
gbbg 2cy October
gbbg 2cy November
gbbg 2cy December

gbbg 3cy January
gbbg 3cy February
gbbg 3cy March
gbbg 3cy April
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
gbbg sub-ad February
gbbg sub-ad March
gbbg sub-ad April
gbbg sub-ad May
gbbg sub-ad June
gbbg sub-ad July
gbbg sub-ad August
gbbg sub-ad September
gbbg sub-ad October
gbbg sub-ad November
gbbg sub-ad December

gbbg ad January
gbbg ad February
gbbg ad March
gbbg ad April
gbbg ad May
gbbg ad June
gbbg ad July
gbbg ad August
gbbg ad September
gbbg ad October
gbbg ad November
gbbg ad December

Great Black-backed Gull (Larus marinus) 4CY, July 30 2014, IJmuiden, the Netherlands.

Immature bird in complete moult: P7-P10 old, old P10 with large mirror (indication for 4CY age). Old 3rd gen secondaries with brownish centres and vermiculated along edges. Active moult in other feather tracts as well, prominent in coverts which are replaced for fresh dark feathers.