Great Black-backed Gull - marinus

Great Black-backed Gull- Grote Mantelmeeuw (marinus)

(last update: 15-2-2007)

gbbg 1cy Aug-Sept
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 Oct-Nov

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 December

gbbg sub-ad January
gbbg sub-ad February
gbbg sub-ad March
gbbg sub-ad April
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 ad Jan-April
gbbg ad June
gbbg ad July
gbbg ad August
gbbg ad September
gbbg ad October
gbbg ad November

*sub-adult: July*		*Great Black-backed Gull (Larus marinus) 4cy E703:* July 27 2004, Westkapelle, the Netherlands. Ringed in 2001, isle of Terschelling, the Netherlands. P7-P10 old. Picture by Jaco Walhout.
		*Great Black-backed Gull (Larus marinus) sub-adult:* July 11 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E). Ageing GBBG may be difficult in sub-adult plumages, but some clues can be found in this bird. The greater coverts are clearly more abraded than the adjacent median coverts, except greater covert #5 which was moulted last in line. The outer lesser coverts show brown-hued centres and the white tips of the tertials are worn away. On average, the upper-parts appear very messy and the older wing-coverts appear weaker than can be expected in full adult plumage.
		*Great Black-backed Gull (Larus marinus) sub-adult / 3cy?* July 11 2002, Le Portel - Boulogne sur Mer, France (50.42 N - 01.34 E).