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)

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Great Black-backed Gull 2cy December

Primary moult score of 2cy GBBG L. marinus. Ringed birds in December on this website.
P8 fully grown . .
P9 fully grown . .
P10 fully grown 7 .
n (sample size): 7 .
m (average): 10 .
SD (stand dev): . .

Notes:
m (average) = number of fully grown new 2nd gen primaries. Fully grown score = tip of the feather exceeds the previous feather, even marginally.

.

remaining 
1
2
3
4
5
6
7
7
8
8
9
10
11
12
remain/new P       
rem
rem
rem
rem
rem
rem
rem
new
rem
new
new
new
new
n(tot) 213
jan
feb
mrch
apr
may
june
july
july
aug
aug
sept
oct
nov
dec
0
.
.
.
.
.
.
1
.
11
.
.
.
.
.
1
.
.
.
.
.
.
.
.
8
.
.
.
.
.
2
.
.
.
.
.
1
3
.
3
.
.
.
.
.
3
.
.
.
.
.
8
4
.
.
.
.
.
.
.
4
.
.
.
.
2
10
.
.
.
.
.
.
.
.
5
.
.
.
.
4
.
.
5
.
.
.
.
.
.
6
.
.
.
1
4
.
.
2
.
6
.
.
.
.
7
.
.
.
.
6
.
.
.
.
13
3
.
.
.
8
.
.
.
.
2
.
.
1
.
2
4
2
1
.
9
.
.
.
2
.
.
.
.
.
.
14
5
4
.
10
31
32
24
5
.
.
.
.
.
.
.
6
6
7
n=
31
32
24
8
18
19
8
8
22
21
21
13
11
7
average m:
10,0
10,0
10,0
9,3
6,1
3,5
2,3
5,6
0,6
6,8
8,5
9,3
9,5
10,0
95% CID
0,00
0,00
0,00
1,16
0,61
0,29
0,87
0,89
0,32
0,27
0,34
0,45
0,46
0,00
inverse 
2,04
2,04
2,07
2,36
2,11
2,10
2,36
2,36
2,08
2,09
2,09
2,18
2,23
2,45
Variance (s2)
0,00
0,00
0,00
1,93
1,52
0,37
1,07
1,13
0,53
0,36
0,56
0,56
0,47
0,00
SD (s)
0,00
0,00
0,00
1,39
1,23
0,61
1,04
1,06
0,73
0,60
0,75
0,75
0,69
0,00
SE (sx) 
0,00
0,00
0,00
0,49
0,29
0,14
0,37
0,38
0,15
0,13
0,16
0,21
0,21
0,00
Percentage
0
0
0
0
0
0
0
13
0
50
0
0
0
0
0
1
0
0
0
0
0
0
0
0
36
0
0
0
0
0
2
0
0
0
0
0
5
38
0
14
0
0
0
0
0
3
0
0
0
0
0
42
50
0
0
0
0
0
0
0
4
0
0
0
0
11
53
0
0
0
0
0
0
0
0
5
0
0
0
0
22
0
0
63
0
0
0
0
0
0
6
0
0
0
13
22
0
0
25
0
29
0
0
0
0
7
0
0
0
0
33
0
0
0
0
62
14
0
0
0
8
0
0
0
0
11
0
0
13
0
10
19
15
9
0
9
0
0
0
25
0
0
0
0
0
0
67
38
36
0
10
100
100
100
63
0
0
0
0
0
0
0
46
55
100
% Controll
100
100
100
100
100
100
100
100
100
100
100
100
100
100

Notes:
Sample of only ringed birds for: Jan, Febr, Mrch, July, Aug, Sept, Oct, Nov, Dec.
Sample of unringed birds for May & June
Sample of mixed ringed and unringed birds for April.

8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JC806 2CY, December 26 2016, IJmuiden, The Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (L. marinus) 2cy JH373 December 09 2011, Boulogne sur Mer, France (50.44 N - 01.35 E). Picture Jean-Michel Sauvage.
gbbgGreat Black-backed Gull (Larus marinus) JT425 2nd-3rd cycle (2CY-3CY), October - December 2014 & December 2015, the Netherlands.
gbbgGreat Black-backed Gull (Larus marinus) JT631 2nd cycle (2CY), July & December 2014, Katwijk aan Zee & IJmuiden, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JU522 2CY, February & December 2016, IJmuiden, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JYY02 2CY, January - February & December 2015, Scheveningen, the Netherlands. Picture: Wim van Yperen & Mars Muusse.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (Larus marinus) JYY47 1CY-3CY, November 2014 - Januay 2016, Scheveningen, the Netherlands.
gbbgGreat Black-backed Gull (L. marinus) 2cy J38X December 02 2008, Westkapelle, the Netherlands.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (L. marinus) 2cy 28K December 01 2012, Calais, France. Picture Jean-Michel Sauvage.
8471j52c.jpg (85052 bytes)Great Black-backed Gull (L. marinus) 44N 2CY, December 11 2014, Boulogne-sur-Mer. Picture: Jean-Michel Sauvage.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) H70T 2cy, December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Probably female.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 03 2015, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 03 2015, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. 2cy trying to prevent a 1cy to take its fish.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Small mirror on P10. Probably female.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Probably female.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (Larus marinus) 2CY, December 26 2016, IJmuiden, the Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Partial autumn moult in wing coverts obvious.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Rather advanced bird in upperparts.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2011, Scheveningen, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Resembling 1cy plumage.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Much resembling 1cy but note tail pattern and pattern on central greater coverts. Also small mirror on P10.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Much resembling 1cy but note tail pattern and pattern on central greater coverts.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Much resembling 1cy but note tail pattern and pattern on central greater coverts.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Probably female.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2011, Scheveningen, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Trouble in the air.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. 2cy (right) with 1cy (left). Note underwing pattern.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Probably female.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 15 2012, IJmuiden, The Netherlands. Yes it will go eventually.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.
2121gbbgad.jpg (50050 bytes)Great Black-backed Gull (L. marinus) 2cy: December 20 2014, IJmuiden, The Netherlands.