Gull Research Organisation

Great Black-backed Gull (Larus marinus) (last update: October 12, 2011)
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 2cy March Description of 1st summer plumage First-summer (Mar-Aug) as first-winter, but head and underparts generally whiter. Mantle, back and scapulars grey with black subterminal bars and shaft-streaks. Upperwing and tail paler with wear. Bill black with smudgy, greyish- or fleshy-tinged base and pale tip to both mandibles. Eye dark. (Malling Olsen, K. & Larsson, H. 2004 Gulls of Europe, Asia and North America. London: Christopher Helm).	*Great Black-backed Gull J43A (Larus marinus) 2cy:* March 15 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E). Picture: J-M Sauvage.
		*Great Black-backed Gull JE1L (Larus marinus) 2cy:* March 25 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Juvenile coverts and tertials. Almost all scapulars moulted to second generation. Note extensive black in tail.
		*Great Black-backed Gull J8K0 (Larus marinus) 2cy:* March 25 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Juvenile coverts and tertials. Almost all scapulars moulted to second generation.
		*Great Black-backed Gull J3TR (Larus marinus) 2cy:* March 22-24 2008, Boulogne-sur-Mer, France (50.42 N - 01.34 E). Picture: J-M Sauvage.
		*Great Black-backed Gull J1KS (Larus marinus) 2cy:* March 28 2008, Boulogne-sur-Mer, France (50.42 N - 01.34 E). Picture: J-M Sauvage.
		*Great Black-backed Gull JL90 (Larus marinus) 2cy:* March 05 2007, IJmuiden, the Netherlands (52.27 N, 4.33 E). Single coverts replaced. Almost all scapulars moulted to second generation.
		*Great Black-backed Gull JM07 (Larus marinus) 2cy:* March 12 2007, IJmuiden, the Netherlands (52.27 N, 4.33 E). Juvenile coverts and tertials. Almost all scapulars moulted to second generation.
		*Great Larus marinus) 2cy JW178* March 04 2011, IJmuiden, the Netherlands.
		*Great Black-backed Gull NOS 362917 (Larus marinus) 2cy:* March 20 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Resembling a juvenile.
		*Great Black-backed Gull NLA 6.038.628 (Larus marinus) 2cy:* March 05 2007, IJmuiden, the Netherlands (52.27 N, 4.33 E). Juvenile coverts and tertials. Almost all scapulars moulted to second generation.
		*Great Black-backed Gull NLA 7.024.244 (Larus marinus) 2cy:* March 02 2007, Lauwersoog, the Netherlands. Picture: Martin.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 05 2007, IJmuiden, the Netherlands.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 05 2007, IJmuiden, the Netherlands.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 15 2003, Boulogne-sur-Mer, France (50.42 N - 01.34 E). Male.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 16 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 16 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 16 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 16 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 17 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E).
		*Great Black-backed Gull (Larus marinus) 2cy:* March 18 2003, Boulogne- sur-Mer, France (50.42 N - 01.34 E). A very powerful and enormous male, still with most feathers fresh juvenile. Probably from far northern Scandinavia or Russia.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 20 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Dark bird.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 20 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Still largely juvenile, including scapulars.
		*Great Black-backed Gull (Larus marinus) 2cy:* March 20 2004, IJmuiden, the Netherlands (52.27 N, 4.33 E). Already a yellow bill.

Great Black-backed Gull (Larus marinus)

Great Black-backed Gull 2cy March

Description of 1st summer plumage