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)

Great Black-backed Gull adult February

MEASUREMENTS

(Malling Olsen, K. & Larsson, H. 2004 Gulls of Europe, Asia and North America. London: Christopher Helm).

Lengths in mm; weights in g. Own data based on skins in NRK, UZM, ZMO. Norway, Sweden, Denmark, Faeroes, Iceland, Greenland.

WING    
Adult male 465-520 (495.8) 95
Adult female 445-497 (471.4) 109
First-year male 438-510 (484.7) 61
First-year female 429-497 (466.5) 43
Second-year male 475-512 (491.5) 26
Second-year female 450-483 (468.3) 24
Note: in Arctic Russia larger: adult male max. 550mm, adult female max. 530 (Glutz von Blotzheim & Bauer 1982).
........................................    
BILL    
Adult male 57.5-66.7 (63.1) 108
Adult female 53.9-64.5 (57.6) 121
First-year male 52.3-66.6 (59.7) 61
First-year female 49.4-62.1 (56.0) 43
Second-year male 57.0-66.5 (62.5) 31
Second-year female 52.4-61.5 (57 .0) 24
Note: in Arctic Russia larger: adult male 55-87, adult female 51-76 (Glutz von Blotzheim & Bauer 1982).
........................................    
BILL DEPTH AT GONYS    
Adult male

23.0-27.3 (25.1) 107
Adult female 20.0-25.4 (22.6) 120
First-year male 18.2-25.8 (22.1) 61
First-year female 18.0-22.2 (20.6) 43
Second-year male 21.9-26.3 (24.2) 29
Second-year female 19.6-22.8 (21.5) 26
........................................    
BILL DEPTH AT BASE OF BILL    
Adult male

22.5-28.2 (25.3) 107
Adult female 20.2-25.8 (22.3) 120
First-year male 18.3-26.7 (23.3) 61
First-year female 18.9-23.9 (21.5) 43
Second-year male 21.3-26.2 (24.5) 29
Second-year female 20.0-23.2 (21.8) 26
Note: Bill depth at middle part of the bill (the narrowest part of bill) normally >20mm, even in smallest birds (L. Svensson pers. comm. ).
........................................    
GONYS LENGTH    

Adult male

14.9-21.5 (18.2) 107
Adult female 14.2-19.5 (16.7) 120
First-year male 12.3-20.1 (16.3) 60
First-year female 11.6-19.3 (15.3) 43
Second-year male
16.0-21.6 (18.3) 29
Second-year female 14.4-18.4 (16.2) 26
........................................    
TARSUS    
Adult male 73.1-84.1 (78.8) 107
Adult female 66.5-78.7 (72.6) 120
First-year male 65.5-83.6 (76.8) 61
First-year female 68.6-81.9 (73.4) 43
Second-year male 72.8-83.6 (77.7) 29
Second-year female 66.8-77.8 (72.3) 26

Weight
Adult Britain, S Scandinavia male 1,126-2,275, female 732-2,075.
Murmansk, N Russia: male 1,380—2,272, female 1,033-2,085. juvenile Murmansk; male 1,400—1,950, female 1,300—1,650.
First-winter female Denmark 1,400.
Second-winter male 1,550
(Harris 1964a, Glutz von Blotzheim & Bauer 1982, Cramp & Simmons 1983, skins in UZM, ZMO).

Note - slight clinal variation across range:
Wing adult male Scandinavia 465-517 (492.9, n=60), Iceland/Faeroes 482-508 (497.8, n=14), Greenland 485-520 (500.7, n=23).
Wing adult female completely overlapping in Scandinavia, Faeroes and Iceland: 445-497 (470.9, n=94), Greenland 463-494 (473.8, n=19).
Bill heaviest in Greenland birds: depth at base in adult male Scandinavia 22.5-27.0 (25.0, n=66), Iceland/Faeroes 24.0-27.7 (26.3, n=12), Greenland 24.4-28.2 (26.2, n=22), adult female Scandinavia 20.3-24.0 (21.9, n=82), Iceland/Faeroes 21.0-24.5 (22.9, n=20), Greenland 20.5-25.2 (22.9, n=19).
Tarsus adult male Scandinavia 73.1-84.1 (78.3, n=45), Faeroes/Iceland 75.3-83.4 (79.9, n=45), Greenland 73.9-83.6 (79.3, n=22), adult female Scandinavia 67.2-78.2 (72.6, n=90), Iceland/Faeroes 68.6-76.6 (74.0, n=21), Greenland 69.2-78.7 (73.1, n=20).

7593.jpg (67822 bytes)Great Black-backed Gull (Larus marinus) SVS 9155846 6cy: February 04 2003, IJmuiden, the Netherlands (52.27 N, 4.33 E). From Sweden.
7593.jpg (67822 bytes)Great Black-backed Gull (Larus marinus) BTO J0658 3cy,8cy,10cy, 2007, 2012, 2014, Boulogne-sur-Mer, France. Pictures: JM Sauvage. Bird now breeding in Boulogne!
9149.jpg (76564 bytes)Great Black-backed Gull (Larus marinus) adult: February 18 2007, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
jz8mjan.jpg (127846 bytes)Great Black-backed Gull (Larus marinus) adult: February 02 2012, IJmuiden, the Netherlands.
8513.jpg (23423 bytes)Great Black-backed Gull L. marinus adult, February 09 2002, Le Portel / Boulogne-sur-Mer, France (50.42N,1.34E).
8523.jpg (69783 bytes)Great Black-backed Gull L. marinus adult, February 09 2002, Le Portel / Boulogne-sur-Mer, France (50.42N,1.34E).
1423.jpg (60708 bytes)Great Black-backed Gull L. marinus adult, February 18 2004, IJmuiden, the Netherlands (52.27N,04.33E). Pale iris.