Herring Gull- Zilvermeeuw (argentatus & argenteus)
(last update: December 15, 2011
Herring Gull adults August
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".
adult Herring Gull in August:
Adults are in active moult. Simultaneously, the median coverts and the outer greater coverts are replaced and strongly contrast with the abraded adjacent wing-coverts.
Tables & Graph
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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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 |
|
|
|
|
|
|
|
|
|
|
|
% 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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|
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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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|
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|
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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 |
|
|
|
|
|
|
|
|
|
|
|
|
|
% 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.
Wing-tip pattern in adult Herring Gull argentatus / argenteus.
At severallocation wing-tip patterns of Herring Gulls have been scored. Data set is too small to make any firm statements, but if people like to cooperate, the classifiocation can be fopund here.
 |
1 | Thayeri pattern on P9 and/or P10. |
| 2 | White
tips on P9 and P10. |
|
| 3 | White
tip on P10, black triangles on P9, mirror P9 on both webs. |
|
| 4 | Black
triangles on P9 and P10. |
|
| 5 | White
tip on P10, full band on P9, mirror P9 on both webs. |
|
| 6 | Black
triangles on P10, full band on P9. |
|
| 7 | Full
bands on P9 and P10, mirror P9 on both webs. |
|
| 8 | Black
triangles on P10, mirror P9 only on inner-web. |
|
| 9 | Incomplete
band on P10, mirror P9 only on inner-web. |
|
| 10 | Full
band on P10, mirror P9 only on inner-web. |
|
| 11 | Incomplete
band on P10, no mirror on P9. |
|
| 12 | Complete band on P10, no mirror on P9. | |
| Score of P5: | ||
| I | No black on P5 (e.g. fig 1 & 2). | |
| II | Diffuse black on outer-web of P5 (e.g. fig 3). | |
| III | Sharp triangle on outer-web of P5 (e.g. fig 4 & 7-12). | |
| IV | Sharp triangle on outer-web, diffuse line on inner-web (e.g. fig 5). | |
| V | Complete band on P5 (e.g. fig 6). | |
| Score of division line between grey centre and black medial band: | ||
| A | Sharp division between grey and black. | |
| B | Diffuse division between grey and black. |
Herring
Gull SXA, ad (argenteus), August 30 2010, Westkapelle, the Netherlands.
Herring
Gull ALAA 14cy (argenteus), August 25 2012, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull AXAZ adult (argenteus), August 01 2003,
Zeebrugge, Belgium.
Herring
Gull BHAK 5cy (argenteus), August 15 2003,
Westkapelle, the Netherlands (51.33N,
03.25E).
Herring
Gull BKAV adult (argenteus), August 01 2003,
Zeebrugge, Belgium.
Herring
Gull adult (argenteus) NMAB November 2010 & August 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring
Gull
(argenteus) adult BLB H-47720 2009-2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring
Gull H-50949 12+cy (argenteus), 2010-2011, Leiden, the Netherlands.
Herring Gull (argenteus) BLB H-66866 October 2003, January 2011 & August-September 2016, Brouwersdam, the Netherlands.
Herring
Gull H-88093 18-19cy (argenteus), 2010-2011, IJmuiden, the Netherlands.
Herring
Gull H-112079 7cy (argenteus), August 11 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull H-111202 adult (argenteus),
August 12 2004, Westkapelle, the Netherlands (51.33N,
03.25E).
Herring Gull H-117941 adult (argenteus), August 01 2010, Neeltje Jans, the Netherlands.
Herring Gull (argenteus) BLB H-125597 10CY, August 02 2010, Neeltje Jans, the Netherlands. 
Herring Gull (argenteus) BLB H-127920 8CY, August 05 2010, Neeltje Jans, the Netherlands. 
Herring
Gull H-131099 6cy (argenteus), August 11 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull H-132415 5cy (argenteus), August 10 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull H-137233 adult (argenteus), August & September 2012, Katwijk, the Netherlands.
Herring Gull (argenteus) BLB H-139873 adult, August 02 2010, Westkapelle, the Netherlands. 
Herring Gull argenteus BLB H-145474 adult, August 2014, Rotterdam-Feijenoord, the Netherlands. Picture: Merijn Loeve. 
Herring Gull (argenteus) H-147125 8CY & 11CY-12CY, 2012 & 2015-2016, IJmuiden, the Netherlands.
Herring
Gull H149397 adult (argenteus), August 27 2011, Boulogne/Mer, France. Picture: J-M Sauvage.
Herring Gull (argenteus) H-151443 adult, October 2009, August 2010 & September 2011, Westkapelle, the Netherlands.
Herring Gull (argenteus) BLB H-152186 adult, August 05 2010, Westkapelle, the Netherlands. 
Herring Gull (argenteus) BLB H152381 adult, August 2010, September 2011 & January 2016, Westkapelle, the Netherlands.
Herring Gull (argenteus) H-162684 adult, August 02 2010, Westkapelle, the Netherlands.
Herring Gull (argenteus) BLB H-164289 adult, August 29 2014, Boulogne-sur-Mer, France. Picture: J-M Sauvage.
Herring
Gull L-99798 11-12cy (argenteus), 2011-2012, IJmuiden, the Netherlands.
Herring
Gull H-xx3232 adult
(argenteus), August 01 2003,
Zeebrugge, Belgium.
Herring
Gull EJ adult (argenteus), August
15 2003, Westkapelle, the Netherlands (51.33N,
03.25E).
Herring
Gull 65 adult (argenteus), August 19 2009, Westkapelle, the Netherlands.
Herring Gull (argenteus) PT 5CY (4th cycle), August 01 2010, Koksijde, Belgium. Picture: Peter Adriaens.
Herring Gull argenteus 98 adult, August 24 2010, Westkapelle, the Netherlands. 
Herring
Gull EN adult (argenteus), August 16 2009, Westkapelle, Netherlands. Picture: M v Kleinwee.
Herring
Gull 5W 6cy (argenteus), August 20 2012, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring
Gull RF adult (argenteus), August 12 2010, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring Gull
(argenteus) UT 7CY, January - August 2014, Dordrecht, the Netherlands. Picture: Theo Muusse & Merijn Loeve.
Herring
Gull (argenteus) adult HJ August 14 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring Gull argenteus JB adult, August 2015 & May 2016, Katwijk, the Netherlands.
Herring
Gull Y.AAH 11cy (argenteus), August 31 2009, IJmuiden, the Netherlands.
Herring
Gull Y.AAK adult (argenteus), 2008-2010, IJmuiden, the Netherlands.
Herring
Gull Y.ACB 10cy (argenteus), August 2009 & 2010, IJmuiden, the Netherlands.
Herring
Gull Y.ACL 6+cy (argenteus), August-September 2010, the Netherlands.
Herring
Gull Y.AFM adult (argenteus), August 24 2010, IJmuiden, the Netherlands.
Herring
Gull Y.AHB adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
Herring
Gull Y.AHS adult (argenteus), August 14 2011, IJmuiden, the Netherlands.
Herring Gull
(argenteus) YALB 1CY-7CY, 2009-2015, IJmuiden, the Netherlands. 
Herring
Gull Y.APF adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
Herring
Gull Y.ASD adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
Herring Gull (argenteus) Y.BDS 1CY-5CY, September 2012 - September 2016, IJmuiden, the Netherlands. Pictures: Maarten van Kleinwee & Mars Muusse.
Herring Gull (argenteus) Y.BHL adult, August 2013 & June 2016, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
Herring Gull (argenteus) Y.BKP adult, May & August 2016, IJmuiden, the Netherlands. 
Herring
Gull M.ABB adult (argenteus), August-September 2011, Leiden, the Netherlands.
Herring
Gull KNAT 8+cy (argenteus), 2010-2011, Leiden, the Netherlands.
Herring Gull (argenteus) M.AZA 5CY, August 14 2016, Brouwersdam, the Netherlands. 
Herring
Gull DA 24-27cy (argenteus), 2009-2010, Leiden, Netherlands.
Herring
Gull E261 5-7cy (argenteus), 2009-2011, Leiden, Netherlands. Pictures: M v Kleinwee.
Herring Gull (argenteus) NLA 5.277.846 13CY-25CY, 2004-2016, IJmuiden, the Netherlands (52.27N-04.33E).
Herring
Gull NLA 5.294.142 12cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
Herring
Gull NLA 5.294.102 15cy (argenteus), August 03 2009, IJmuiden, the Netherlands.
Herring
Gull NLA 5.344.241 5cy (argenteus), August 23 2008, IJmuiden, the Netherlands.
Herring Gull argenteus 5.349.415 adult, August 22 2015, IJmuiden, the Netherlands.
Herring
Gull NLA 5.352.670 6cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
Herring
Gull NLA 5.352.764 5cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
Herring
Gull NLA 5.359.471 12+cy (argenteus), August 14 2010, Leiden, the Netherlands.
Herring Gull (argenteus) NLA 5.365.770 10CY, August 02 2010, Westkapelle, the Netherlands.
Herring Gull (argenteus) NLA 5.377.894 adult, August 2010 & September 2011, Westkapelle, the Netherlands.
Herring Gull
(argenteus) NLA 5.412.001 adult, August 30 2016, IJmuiden, the Netherlands.
Herring
Gull NLA 5.412.375 5cy (argenteus), August 23 2008, IJmuiden, the Netherlands.
Herring Gull (argenteus) NLA 5.412.869 2CY & 7CY, October 2005 & August 2010, Westkapelle, the Netherlands.
Herring
Gull 5.419.235 6cy (argenteus), 2010-2011, Leiden, Netherlands.
Herring Gull (argenteus) NLA 5.424.826 8CY, August -September 2015, IJmuiden, the Netherlands (52.27N
04.33E). 
Herring Gull (argenteus) 5.425.481 adult, September 2011, January 2012 & August 2015, IJmuiden, the Netherlands.
Herring Gull NLA 6.125.397 ad (argenteus), August 24 2010, Neeltje Jans, the Netherlands.
Herring Gull argenteus 6.125.871 5CY, 8CY & 9CY, 2012 & 2015-2016, IJmuiden, the Netherlands.
Herring Gull (argenteus) 6.126.250 8cy, August 25 2011, IJmuiden, the Netherlands.
Herring Gull
(argenteus) NLA 6.126.723 10CY, August 30 2016, IJmuiden, the Netherlands.
Herring Gull (argenteus) NLA 6.166.365 6CY, August 22 2015, IJmuiden, the Netherlands.
Herring Gull (argenteus) NLA 6.166.402 7CY, August 23 2016, Maasvlakte, the Netherlands.
Herring Gull (argenteus) NLA 6.166.494 6CY, August 18 2015, IJmuiden, the Netherlands (52.27N
04.33E). 
hybrid
HG x YLG EP30 11cy (argenteus x michahellis), August 13 2007, Westkapelle, the Netherlands (51.33N- 03.25E). Picture by Pim Wolf. Ringed on June 23 1997, offspring of a true male michahellis (ringed orange EAY8) and a female argenteus.
Herring
Gull adult X994 (argentatus), August 2003 & 2008, Boulogne/Mer, France (50.43N-01.37E).
Herring
Gull DN-083xx adult (argentatus), August 12 2002,
Tampere, Finland (61.31N,
23.43E).
Herring
Gull C2179 5cy (argentatus),
August
11 2002, Tampere,
Finland (61.31N,23.43E).
Herring
Gull C2192 5cy (argentatus),
August 09 2002, Tampere, Finland (61.31N,23.43E).
Herring
Gull C656R 5cy (argentatus),
August
11 2002, Tampere,
Finland (61.31N,23.43E).
Herring
Gull C154A 5cy (argentatus), August
12 2002, Tampere,
Finland (61.31N,23.43E).
Herring
Gull C156H 5cy (argentatus), August 07 2002, Tampere, Finland (61.31N,23.43E).
Herring
Gull CR47 6cy (argentatus), August 08 2002, Tampere, Finland (61.31N,
23.43E).
Herring
Gull CT57 6cy (argentatus), August 09 2002, Tampere,
Finland (61.31N,
23.43E).
Note the dark iris yellow legs.
Herring
Gull HT-204151 6cy (argentatus), August 12 2002, Tampere,
Finland (61.31N,
23.43E).
Herring
Gull HT-092?72 adult (argentatus), August 06
2002, Tampere, Finland (61.31N,
23.43E).
A yellow-legged Herring Gull.
Herring
Gull HT-xxx adult (argentatus), August 07 2002,
Tampere, Finland (61.31N,
23.43E).
Note the intense yellow legs.
Herring
Gull HT-xxx adult (argentatus), August 07
2002, Tampere, Finland (61.31N,
23.43E).
Herring
Gull xx0300 adult (argentatus), August 12 2002,
Tampere, Finland (61.31N,
23.43E).
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 22 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 22 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
Herring
Gull adult (argenteus), August 29 2012, IJmuiden, the Netherlands.
Herring
Gull adult (argentatus), August 06 2002,
Tampere, Finland (61.31N,
23.43E). Thayeri pattern on P9 and P10, combined with yellow legs. 
Herring
Gull adult (argentatus), August 06 2002,
Tampere, Finland (61.31N,
23.43E).
Note the white tongue on P10.
Herring
Gull adult (argentatus), August 06 2002,
Tampere, Finland (61.31N,
23.43E).
Herring
Gull adult (argentatus), August 06 2002,
Tampere, Finland (61.31N,
23.43E).
Note the thayeri pattern.
Herring Gull adult (argentatus),
August 07 2002, Tampere, Finland (61.31N,
23.43E).
Note the intense yellow legs. P5 no black, P10-tip merges with
mirror.
Herring
Gull adult (argentatus), August 07 2002,
Tampere, Finland (61.31N,
23.43E).
Note the intense yellow legs.
Herring
Gull adult (argentatus), August 09 2002,
Tampere, Finland (61.31N,
23.43E).