Herring Gull- Zilvermeeuw (argentatus & argenteus)
(last update: December 15, 2011
Herring Gull adults November
Herring Gull group, November 14 2012, Katwijk, the Netherlands. Resting flock.
Introduction
This website deals with the Herring Gulls of the taxa argentatus and argenteus. Argenteus is an abundant breeding species on Iceland, Britain, NW France, Belgium, the Netherlands and N Germany. The taxon argentatus breeds in NE Europe, from Denmark, the coast of the Baltic Sea, Scandinavia and coast of the White Sea. In the centre of the breeding range (Denmark and the NW German coast), birds show intermediate characteristics, indicating there is a cline in argenteus-argentatus. Argenteus in Western Europe is pale-backed, slightly smaller and with relatively much black in the wing-tip; argentatus in the NE Europe is larger, slightly darker on upper-parts and show less black in the wing-tip.
Due to the large breeding range, there is much intra-specific variation in argentatus, with most large, powerful birds in the northern populations, showing the most darkest upper-parts, longest wing and most white in the outer-wing. In this region, some populations may hold substantial number of yellow-legged argentatus. (referred to as "Finnmark yellow-legged argentatus"). In adult plumage, the black sub-terminal spot on P5 is often lacking or strongly reduced to a diffuse streak, broken at the centre. Sometimes P6 lacks black as well.
In the Baltic region, other yellow-legged argentatus populations occur ("Baltic yellow-legged argentatus"), with adults showing even brighter yellow legs in summer and the upper-parts only slightly darker than West European argenteus, still much paler than Yellow-legged Gull (michahellis). Those Baltic argentatus often show a black sub-terminal spot on P5 in adult plumage.
On these web-pages, we largely follow P.J. Grant: "Gulls, a guide to identification" and E.K Barth's publication as Contribution No. 86, Zoological Museum, University of Oslo: "The circumpolar systematics of Larus argentatus and Larus fuscus with special reference to the Norwegian populations".
Herring Gull, November 14 2012, Katwijk, the Netherlands. Group in sun light.
Tables & Graph
The differences between typical western argenteus from the U.K. and northern Scandinavian argentatus is rather straightforward on primary pattern P5-P10. However, there is a gradient and overlap in features of birds from populations in northern Germany, Denmark and southern Norway. Extensive research on the P10 pattern of Scandinavian argentatus was done for Norwegian birds by the Norwegian ornithologist Edvard Barth, and is presented in the table in the Adult January Section.
Adult argenteus from the Netherlands and Belgium have finished the complete moult by the end of the month. The table below presents the primary moult stage for November.
Primary Moult Score of adult Herring Gull (argenteus & argentatus) at Scheveningen, the Netherlands in November, ranked by date. |
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| date > | 03-11-00 | 11-11-00 | 14-11-01 | 15-11-02 | 20-11-00 | 28-11-00 |
| P6 | 1 | - | - | - | - | - |
| P7 | 10 | - | 5 | 5 | - | - |
| P8 | 71 | 37 | 70 | 79 | 31 | 20 |
| P9 | 23 | 38 | 80 | 57 | 60 | 60 |
| P10 | 3 | 12 | 22 | 2 | 36 | 156 |
| n (tot): | 108 | 87 | 177 | 143 | 127 | 236 |
| m (av): | 8,16 | 8,71 | 8,67 | 8,39 | 9,04 | 9,58 |
| 95% CID: | 0,13 | 0,15 | 0,11 | 0,10 | 0,13 | 0,08 |
| SD (s): | 0,66 | 0,70 | 0,73 | 0,58 | 0,73 | 0,64 |
n (tot):
Total of individuals by date. Total this month, n: 878. |
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Long term analysis for primary moult score (PMS).
remaining AUTUMN |
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starting date: |
13 Aug |
20 Aug |
27 Aug |
03 Sep |
10 Sep |
17 Sep |
01 Oct |
15 Oct |
05 Nov |
12 Nov |
week no: |
33 |
34 |
35 |
36 |
37 |
38 |
40 |
42 |
45 |
46 |
0 |
0 |
0 |
0 |
0 |
|
4 |
170 |
54 |
32 |
105 |
1 |
0 |
0 |
1 |
6 |
|
13 |
24 |
10 |
1 |
1 |
2 |
0 |
3 |
22 |
35 |
1 |
4 |
9 |
2 |
|
|
3 |
9 |
71 |
103 |
63 |
|
1 |
|
1 |
|
|
4 |
30 |
99 |
34 |
4 |
|
0 |
|
|
|
|
5 |
11 |
29 |
5 |
0 |
|
0 |
|
|
|
|
6 |
0 |
0 |
0 |
0 |
|
0 |
|
|
|
|
7 |
0 |
0 |
0 |
0 |
|
0 |
|
|
|
|
8 |
0 |
0 |
0 |
0 |
|
0 |
|
|
|
|
9 |
0 |
0 |
0 |
0 |
|
0 |
|
|
|
|
10 |
0 |
0 |
0 |
0 |
|
0 |
|
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n= |
50 |
202 |
165 |
108 |
1 |
22 |
203 |
67 |
33 |
106 |
average REM P: |
4.0 |
3.8 |
3.1 |
2.6 |
2.0 |
1.1 |
0.2 |
0.3 |
0.0 |
0.0 |
95% CID = |
0.18 |
0.10 |
0.11 |
0.12 |
|
0.33 |
0.07 |
0.14 |
0.06 |
0.02 |
inverse = |
2.01 |
1.97 |
1.97 |
1.98 |
|
2.08 |
1.97 |
2.00 |
2.04 |
1.98 |
Variantie (s2) = |
0.41 |
0.50 |
0.47 |
0.43 |
|
0.56 |
0.25 |
0.34 |
0.03 |
0.01 |
SD (s) = |
0.64 |
0.71 |
0.69 |
0.65 |
|
0.75 |
0.50 |
0.59 |
0.17 |
0.10 |
SE (sx) = |
0.09 |
0.05 |
0.05 |
0.06 |
|
0.16 |
0.04 |
0.07 |
0.03 |
0.01 |
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% class: |
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0 |
0 |
0 |
0 |
0 |
0 |
18 |
84 |
81 |
97 |
99 |
1 |
0 |
0 |
1 |
6 |
0 |
59 |
12 |
15 |
3 |
1 |
2 |
0 |
1 |
13 |
32 |
100 |
18 |
4 |
3 |
0 |
0 |
3 |
18 |
35 |
62 |
58 |
0 |
5 |
0 |
1 |
0 |
0 |
4 |
60 |
49 |
21 |
4 |
0 |
0 |
0 |
0 |
0 |
0 |
5 |
22 |
14 |
3 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
6 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
7 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
8 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
9 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
10 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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|
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% control: |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
0 = 0 old primaries left (P10 dropped); 10 = all 10 primaries still old and present.
Above: Scatter Plot for PMS in adult Herring Gulls. Number of remaining old primaries throughout the year. Sample size is 1.329 birds.
new: AUTUMN |
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starting date: |
17 Sep |
24 Sep |
01 Oct |
08 Oct |
15 Oct |
22 Oct |
29 Oct |
05 Nov |
12 Nov |
19 Nov |
26 Nov |
03 Dec |
week no: |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
0 |
0 |
|
0 |
|
1 |
0 |
0 |
0 |
0 |
0 |
|
|
0 |
0 |
|
0 |
|
2 |
3 |
0 |
0 |
0 |
0 |
|
|
0 |
0 |
|
0 |
|
3 |
1 |
0 |
0 |
0 |
0 |
|
|
0 |
0 |
|
0 |
|
4 |
10 |
0 |
0 |
0 |
0 |
|
|
0 |
0 |
|
0 |
|
5 |
98 |
26 |
2 |
1 |
1 |
|
|
0 |
0 |
|
0 |
|
6 |
138 |
100 |
127 |
9 |
4 |
|
1 |
0 |
0 |
|
0 |
|
7 |
44 |
55 |
391 |
175 |
65 |
24 |
10 |
2 |
20 |
|
0 |
|
8 |
6 |
1 |
104 |
98 |
83 |
87 |
71 |
54 |
222 |
31 |
20 |
2 |
9 |
0 |
0 |
3 |
4 |
4 |
18 |
23 |
49 |
256 |
60 |
76 |
13 |
10 |
0 |
0 |
0 |
0 |
0 |
|
3 |
15 |
39 |
36 |
222 |
59 |
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n= |
300 |
182 |
627 |
287 |
157 |
129 |
108 |
120 |
537 |
127 |
318 |
74 |
average NEW P: |
5.7 |
6.2 |
7.0 |
7.3 |
7.5 |
8.0 |
8.2 |
8.6 |
8.6 |
9.0 |
9.6 |
9.8 |
95% CID = |
0.10 |
0.10 |
0.05 |
0.07 |
0.10 |
0.10 |
0.13 |
0.13 |
0.06 |
0.13 |
0.07 |
0.11 |
inverse = |
1.97 |
1.97 |
1.96 |
1.97 |
1.98 |
1.98 |
1.98 |
1.98 |
1.96 |
1.98 |
1.97 |
1.99 |
Variantie (s2) = |
0.81 |
0.44 |
0.40 |
0.33 |
0.39 |
0.33 |
0.43 |
0.52 |
0.46 |
0.53 |
0.36 |
0.23 |
SD (s) = |
0.90 |
0.66 |
0.63 |
0.58 |
0.63 |
0.57 |
0.66 |
0.72 |
0.68 |
0.73 |
0.60 |
0.48 |
SE (sx) = |
0.05 |
0.05 |
0.03 |
0.03 |
0.05 |
0.05 |
0.06 |
0.07 |
0.03 |
0.06 |
0.03 |
0.06 |
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% class: |
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0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
2 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
3 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
4 |
3 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
5 |
33 |
14 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
6 |
46 |
55 |
20 |
3 |
3 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
7 |
15 |
30 |
62 |
61 |
41 |
19 |
9 |
2 |
4 |
0 |
0 |
0 |
8 |
2 |
1 |
17 |
34 |
53 |
67 |
66 |
45 |
41 |
24 |
6 |
3 |
9 |
0 |
0 |
0 |
1 |
3 |
14 |
21 |
41 |
48 |
47 |
24 |
18 |
10 |
0 |
0 |
0 |
0 |
0 |
0 |
3 |
13 |
7 |
28 |
70 |
80 |
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% control: |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
100 |
Table above, data for the Netherlands (2000-2010), results for autumn & winter (aggregated week): number of new, fully grown primaries in adults.
0 = no new primaries visible. So either P1 still old, or P1 dropped, but the very tip still not visible.
1 = P1 longest new primary. Range between "at least the tip of P1 is visible" until "tip of P2 still shorter than P1".
2 = P2 longest new primary. 3 = etc.
Above: Scatter Plot for PMS in adult Herring Gulls throughout the year. Longest new primary is classified "fully grown". Sample size is 3.271 birds. Birds scored on NEW primaries.
The first date in our analysis on adult Herring Gulls is 02 May 2006 (week 18 - starting 30 April), on which we already found birds with missing primaries (some birds had already shed 3 primaries). This group of actively moulting birds, 43% of the sample, must have started the complete moult somewhere around mid-April and probably several birds may have started earlier.
The last scoring day has been 03 December, when still 20% of the sampled birds had to grow P10. The final stage of the complete moult for all birds has to be somewhere after mid-December. On 03 December we scored 59 birds with P10 fully grown, 13 birds with P9 fully grown and 2 birds with P8 fully grown. They all had no old primaries left.
The first time a new primary (P1) was visible, was also on 02 May 2006 (week 18 - starting 30 April). In this week, 90% of the sample did not show new primaries, but 9% did. Four birds in the sample of 115 birds alreday had P2 as longest primary (fully grown). As soon as the tip of P1 was visible, this was automatically scored "fully grown", and this was the case in 7 birds. For the other primaries to be scored fully grown, they had to exceed the previous primary in length (so P2 fully grown, only from when it is longer than P1).
LINEAR REGRESSION
Onset of primary moult can best be illustrated by a sinusoid for the first few weeks and last weeks, but there appears to be linear dependency over much of the central moult period.
LINEAR REGRESSION FOR OLD REMAINING PRIMARIES
Complete sample: Linear regression (n = 1329, R2= 0.935, sign: P<0,000)
PMS = -0,379* WEEK + 16,324.
LINEAR REGRESSION FOR NEW FULLY GROWN PRIMARIES
Complete sample: Linear regression (n = 3271 R2= 0.927, sign: P<0,000)
PMS = 0,322* WEEK - 6,071.
Herring Gull JW8T adult, November 13 2014, Oostende, Belgium. Picture: Peter Adriaens. 
Herring Gull (argenteus) 5cy HS A November 07 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring
Gull AAAG adult (argenteus), November 17 2002, Westkapelle, the Netherlands
(51.33N 03.25E).
Herring Gull ABAY adult (argenteus), November 20 2005, Westkapelle, the
Netherlands (51.33N 03.25E). Picture Pim Wolf.
Herring
Gull AKAK 8cy (argenteus), November 26 2006, Oostende, Belgium. 
Herring
Gull AVAW 5cy (argenteus), November 15 2003, Westkapelle,
the Netherlands (51.33N 03.25E).
Herring
Gull AXAD adult (argenteus), November 01 2004, Westkapelle, the Netherlands
(51.33N 03.25E). Picture Pim Wolf.
Herring Gull BHAK 7cy (argenteus), November 20 2005, Westkapelle, the
Netherlands (51.33N 03.25E). Picture Pim Wolf.
Herring Gull BSAD adult (argenteus), November 20 2005, Westkapelle, the
Netherlands (51.33N 03.25E). Picture Pim Wolf.
Herring
Gull BXAH 7cy (argenteus), November 26 2006, Oostende, Belgium.
Herring
Gull BWAR 7cy (argenteus), November 26 2006, Oostende, Belgium.
Herring
Gull BYAS adult (argenteus), November 01 2004, Westkapelle, the Netherlands
(51.33N 03.25E). Picture Pim Wolf.
Herring
Gull BYAT adult (argenteus), November 01 2004, Westkapelle, the Netherlands
(51.33N 03.25E). Picture Pim Wolf.
Herring
Gull BZAH 7cy (argenteus), November 26 2006, Oostende, Belgium
Herring
Gull CAAU adult (argenteus), November 01 2002, Westkapelle, the Netherlands
(51.33N-03.25E).
Herring Gull (argenteus) CGAC 3CY & 5CY (3rd & 5th cycle), June 2010 & November 2012, De Panne, Belgium. Picture: Peter Adriaens. 
Herring Gull (argenteus) CTAC adult, November 23 2010, Koksijde, Belgium. Picture: Peter Adriaens. 
Herring
Gull FJAK 5cy (argenteus), November 09 2010, Boulogne/Mer, France. Picture: J-M Sauvage.
Herring Gull (argenteus) FKAK 15CY-16CY, December 2011 - November 2012, Koksijde, Belgium. Picture: Peter Adriaens.
Herring Gull (argenteus) KPAM adult, February 2011 & November 2012, Oostende, Belgium. Picture: Peter Adriaens. 
Herring Gull (argenteus) KSAC adult, November 27 2011, Oostende, Belgium. Picture: Peter Adriaens. 
Herring Gull (argenteus) KVAB 5CY (5th cycle), November 17 2012, Oostduinkerke, Belgium. Picture: Peter Adriaens. 
Herring
Gull KYAK adult (argenteus), November 24 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring Gull KY.AV adult, November 19 2013, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.
Herring
Gull NMAB adult (argenteus), November 10 2010, Boulogne/Mer, France. Picture: J-M Sauvage.
Herring Gull (argenteus) SBAJ 8CY, January - November 2012, Koksijde, Belgium. Picture: Peter Adriaens. 
Herring
Gull
(argenteus) adult BLB H-47720 2009-2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring
Gull H-117150 6cy (argenteus), November 26 2006, Oostende, Belgium.
Herring
Gull H-117289 6cy (argenteus), November 26 2006, Oostende, Belgium. 
Herring
Gull H-117465 5cy (argenteus), November 26 2006, Oostende, Belgium. 
Herring
Gull H-124357 5cy (argenteus), November 26 2006, Oostende, Belgium. 
Herring
Gull H-125344 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
Herring
Gull H-125463 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter. Argentatus on grey tone.
Herring
Gull H-125585 adult (argenteus),
November 16 2002, Westkapelle, the Netherlands (51.33N-03.25E).
Herring Gull BLB H-127133 adult, November 11 2012, Oostende, Belgium. Picture: Peter Adriaens.
Herring
Gull H-128151 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
Herring
Gull H-132217 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
Herring
Gull H-136635 adult, November 26 2006, Oostende, Belgium.
Herring Gull (argenteus) adult H-144089 November 07 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring Gull H-151455 adult (argenteus), November 20 2009, Scheveningen, the Netherlands.
Herring Gull BLB H 162877 adult, November 23 2013, Boulogne-sur-Mer, France. Picture: J-M Sauvage.
Herring Gull BLB H-x33168 adult, November 11 2012, Oostende, Belgium. Picture: Peter Adriaens.
Herring
Gull (argenteus) L-99798 11-12cy, 15cy, 2011-2015, IJmuiden, the Netherlands.
Herring Gull argenteus 0.H adult, November 24 2016, Katwijk, the Netherlands. 
Herring Gull (argenteus) 0.N adult, October 2011 - November 2015, Scheveningen & Maasvlakte, the Netherlands.
Herring
Gull 0.Y adult (argenteus), November 10 2011, Scheveningen, the Netherlands.
Herring Gull (argenteus) 9N adult, October - November 2015, Scheveningen, the Netherlands. 
Herring Gull L0 female (argenteus), November 28 2008, Amsterdam, the Netherlands.
Herring Gull PV male (argenteus), November 21 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring Gull argenteus TZ adult (4+CY), November 13 2015, Katwijk, the Netherlands.
Herring Gull L4 6cy (argenteus), November 28 2008, Amsterdam, the Netherlands.
Herring Gull argenteus 1= 29CY-32CY, November - January 2016-2019, Katwijk, the Netherlands.
Herring Gull (argenteus) YAFM adult, 2010-2011 & 2015, IJmuiden, the Netherlands.
Herring Gull argenteus Y.AFS adult, November 16 2016, Katwijk, the Netherlands.
Herring Gull (argenteus) Y.APV adult, November 2015 & October 2016, Katwijk, the Netherlands.
Herring Gull (argenteus) Y.BAJ 10CY, February & November 2016, IJmuiden & Katwijk, the Netherlands.
Herring Gull
(argenteus) YBAK adult, November 25 2015, IJmuiden, the Netherlands. 
Herring Gull
(argenteus) YBAX adult, April 2015 - February 2016, IJmuiden, the Netherlands. 
Herring Gull
(argenteus) YBVN adult, November 25 2015, IJmuiden, the Netherlands. 
Herring Gull (argenteus) MADC 10CY, November 17 2014, Katwijk, the Netherlands.
Herring
Gull E110 adult (argenteus), November 23 2011, Scheveningen, the Netherlands.
Herring Gull argenteus 1= 29CY, November 16 & December 19 2016, Katwijk, the Netherlands.
Herring Gull argenteus 5.038.584 adult, November
2003 & October 2009, Westkapelle, the Netherlands (51.33N 03.25E). 
Herring
Gull 5.334.963 5cy (argenteus), November 15 2003, Westkapelle,
the Netherlands (51.33N 03.25E).
Herring Gull (argenteus) NLA 5.242.147 9+CY, November 22 2015, IJmuiden, the Netherlands. 
Herring Gull argenteus NLA 5.352.687 13CY, 16CY & 17CY, November 2013 & May 2016 - March 2017, Katwijk aan Zee, the Netherlands.
Herring
Gull 11cy 5.352.700 (argenteus), November 23 2011, Scheveningen, the Netherlands.
Herring
Gull 5.419.235 6cy (argenteus), 2010-2011, Leiden, Netherlands.
Herring
Gull NLA.5.424.838 adult (argenteus) November 19 2009, IJmuiden, the Netherlands.
Herring Gull NLA 6.169.432 6CY, November 16 2016, Katwijk, the Netherlands.
Herring Gull (argenteus) NLA 5xxx013 adult (4+CY), November 13 2015, Katwijk, the Netherlands.
Herring
Gull Eadult (argenteus), November 10 2011, Scheveningen, the Netherlands.
Herring Gull (argentatus) H02P adult, November 18 2014, Terschelling, the Netherlands. Picture: Jacob Jan de Vries.
Herring
Gull V173 adult (argentatus), November 17 2002, Westkapelle, the Netherlands
(51.33N-03.25E).
Herring
Gull 4132037 adult (argentatus), November 01 2002, Westkapelle, the Netherlands
(51.33N-03.25E).
Herring Gull argentatus J2925 adult, November 05 2016, Stavanger, Norway. Picture: Rubén Piculo Mateo.
Herring Gull argentatus J2960 adult, November 05 2016, Stavanger, Norway. Picture: Rubén Piculo Mateo.
Herring Gull argentatus J3008 adult, November 05 2016, Stavanger, Norway. Picture: Rubén Piculo Mateo.
Herring Gull (argentatus) J7182 6CY, November 27 2014, Hovindam - Oslo, Norway. Picture: John Sandøy.
Herring Gull (argentatus) J7832 9CY, November 26 2014, Hovindam - Oslo, Norway. Picture: John Sandøy.
Herring Gull argentatus JAH20 adult, November 05 2016, Stavanger, Norway. Picture: Rubén Piculo Mateo.
Herring
Gull JCG4 adult (argentatus), November 04 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull 365231 adult (argentatus), November 16 2002, Westkapelle, the Netherlands
(51.33N-03.25E).
Herring Gull (argentatus) C59VH 2CY-6CY, February 2010, January 2012 & November 2014, the Netherlands. 
Herring
Gull SFH HT082209 25cy (argentatus), November 2003 & December 2008, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
Herring
Gull T55420 adult (argentatus), November 17 2003, Westkapelle, the Netherlands. Picture Norman van Swelm.
Herring
Gull 7C adult (argentatus), November 06 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
Herring Gull argentatus KF04 5CY, November 01 2014, Terschelling strand, the Netherlands. Picture: Jacob Jan de Vries.
Herring Gull (argentatus) KY35 8CY (8th cycle), November 13 2015, West-Terschelling, the Netherlands. Picture: Jacob Jan de Vries.
Herring Gull (argentatus type) 96P3 2CY & 7CY, January 2009 & November 2014, Spain & Belgium. Picture: Quique Carballal & Peter Adriaens.
Herring Gull argentatus adult, November 19 2015, Scheveningen, the Netherlands.
Herring Gull argentatus adult, November 26 2015, Katwijk, the Netherlands.
Herring Gull adult, November 11 2016, Katwijk, the Netherlands.
Herring Gull adult, November 11 2016, Katwijk, the Netherlands.
Herring Gull adult, November 11 2016, Katwijk, the Netherlands.
Herring Gull adult, November 11 2016, Katwijk, the Netherlands.
Herring Gull adult, November 11 2016, Katwijk, the Netherlands.
Herring
Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. Much black on bill. Limited black in wing-tip..jpg)
Herring
Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. Much black on bill. No black on P5.
Herring
Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. No black on P5.
Herring
Gull (argentatus) adult, November 26 2013, Katwijk aan Zee, the Netherlands.
Herring
Gull (argentatus) adult, November 26 2013, Katwijk aan Zee, the Netherlands.
Herring Gull argentatus adult, November 24 2014, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull argenteus adult, November 26 2015, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. Broken band on P10, no mirror on P9 (right wing; P9 mirror present on left wing), broken black band on P5.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. Black on outerweb of P5.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P10 growing.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P9-P10 growing. Black on P4.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P10 growing. No black on P5.
Herring
Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P10 with small mirror. No mirror on P9 (right wing, left wing has mirror on P9). black on P4.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 26 2015, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring
Gull adult, November 20 2012, Katwijk, the Netherlands. Much black on bill. No mirror on P9. Note long pointed black line on outerweb of P6.
Herring
Gull adult, November 20 2012, Katwijk, the Netherlands.
Herring
Gull adult, November 20 2012, Katwijk, the Netherlands. Much black on bill. Full band on P5.
Herring
Gull adult, November 20 2012, Katwijk, the Netherlands.
Herring Gull adult, November 11 2014, Katwijk, the Netherlands. 
Herring Gull adult, November 12 2015, Katwijk, the Netherlands.
Herring Gull adult, November 11 2014, Katwijk, the Netherlands. 
Herring
Gull adult, November 20 2012, Katwijk, the Netherlands. Much black on bill.
Herring Gull adult, November 25 2014, Katwijk, the Netherlands.
Herring
Gull adult (argentatus), November 16 2002, Westkapelle,
the Netherlands (51.33N-03.25E). P9 and P10 have an extreme thayeri-pattern,
with hardly any black on P10.
Herring
Gull adult (argentatus), November 17 2002, Westkapelle,
the Netherlands (51.33N-03.25E). A yellow-legged individual from the
Baltic region.
Herring
Gull adult (argentatus), November 11 1991,
Worcestershire, Britain. Photograph by Peter Stewart.
Herring
Gull adult (argentatus), November 17 2002, Westkapelle, the
Netherlands (51.33N-03.25E). Another typical yellow-legged
individual from the Baltic region
Herring
Gull adult (argentatus), November 16 2002, Westkapelle,
the Netherlands (51.33N-03.25E).