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

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

% class:

 

 

 

 

 

 

 

 

 

 

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

  Table above, data for the Netherlands (2000-2010), results for spring & summer (aggregated week): number of remaining old primaries in adults.
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

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

% class:

 

 

 

 

 

 

 

 

 

 

 

 

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.

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.
rings argenteus: France
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull SXA, ad (argenteus), August 30 2010, Westkapelle, the Netherlands.
rings argenteus: Belgium
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull ALAA 14cy (argenteus), August 25 2012, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in August, ringed in Belgium. (64686 bytes)Herring Gull AXAZ adult (argenteus), August 01 2003, Zeebrugge, Belgium.
3cy argenteus in August, ringed in Belgium. (70404 bytes)Herring Gull BHAK 5cy (argenteus), August 15 2003, Westkapelle, the Netherlands (51.33N, 03.25E).
adult argenteus in August, ringed in Belgium. (73892 bytes)Herring Gull BKAV adult (argenteus), August 01 2003, Zeebrugge, Belgium.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus) NMAB November 2010 & August 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull (argenteus) adult BLB H-47720 2009-2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-50949 12+cy (argenteus), 2010-2011, Leiden, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-88093 18-19cy (argenteus), 2010-2011, IJmuiden, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-112079 7cy (argenteus), August 11 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull H-111202 adult (argenteus), August 12 2004, Westkapelle, the Netherlands (51.33N, 03.25E).
adult argenteus in October, ringed in Belgium. (60142 bytes)Herring Gull H-117941 adult (argenteus), August 01 2010, Neeltje Jans, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-131099 6cy (argenteus), August 11 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-137233 adult (argenteus), August & September 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-147125 adult (argenteus), August 29 2012, IJmuiden, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull H149397 adult (argenteus), August 27 2011, Boulogne/Mer, France. Picture: J-M Sauvage.
adult argenteus in August, ringed in Belgium. (82178 bytes)Herring Gull H-xx3232 adult (argenteus), August 01 2003, Zeebrugge, Belgium.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull H-132415 5cy (argenteus), August 10 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull L-99798 11-12cy (argenteus), 2011-2012, IJmuiden, the Netherlands.
rings argenteus: the Netherlands
adult argenteus in August, ringed in the Netherlands. (50865 bytes)Herring Gull EJ adult (argenteus), August 15 2003, Westkapelle, the Netherlands (51.33N, 03.25E).
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull 65 adult (argenteus), August 19 2009, Westkapelle, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (79042 bytes)Herring Gull EN adult (argenteus), August 16 2009, Westkapelle, Netherlands. Picture: M v Kleinwee.
adult argenteus in October, ringed in the Netherlands. (79042 bytes)Herring Gull 5W 6cy (argenteus), August 20 2012, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in October, ringed in the Netherlands. (79042 bytes)Herring Gull RF adult (argenteus), August 12 2010, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull (argenteus) adult HJ August 14 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AAH 11cy (argenteus), August 31 2009, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AAK adult (argenteus), 2008-2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACB 10cy (argenteus), August 2009 & 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ACL 6+cy (argenteus), August-September 2010, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AFM adult (argenteus), August 24 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHB adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.AHS adult (argenteus), August 14 2011, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.APF adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull Y.ASD adult (argenteus), August 13 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull M.ABB adult (argenteus), August-September 2011, Leiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull KNAT 8+cy (argenteus), 2010-2011, Leiden, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull DA 24-27cy (argenteus, 2009-2010, Leiden, Netherlands.
adult argenteus in October, ringed in the Netherlands. (79042 bytes)Herring Gull E261 5-7cy (argenteus), 2009-2011, Leiden, Netherlands. Pictures: M v Kleinwee.
adult argenteus in February, ringed in the Netherlands. (78145 bytes)Herring Gull NLA 5.277.846 15cy (argenteus), August 18 2006, IJmuiden, the Netherlands (52.27N 04.33E).
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.294.142 12cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.294.102 15cy (argenteus), August 03 2009, IJmuiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.344.241 5cy (argenteus), August 23 2008, IJmuiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.352.670 6cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.352.764 5cy (argenteus), August 12 2006, IJmuiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.359.471 12+cy (argenteus), August 14 2010, Leiden, the Netherlands.
adult argenteus in August, ringed in Belgium. (86047 bytes)Herring Gull NLA 5.412.375 5cy (argenteus), August 23 2008, IJmuiden, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull 5.419.235 6cy (argenteus), 2010-2011, Leiden, Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull NLA 6.125.397 ad (argenteus), August 24 2010, Neeltje Jans, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull NLA 6.125.871 5cy (argenteus), August 29 2012, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 6.126.250 8cy (argenteus), August 25 2011, IJmuiden, the Netherlands.
3cy hybrid argenteus x michahellis in November, ringed in the Netherlands. (66565 bytes)hybrid HG x YLG EP30 11cy (argenteus x michahellis), August 13 2007, Westkapelle, the Netherlands (51.33N- 03.25E). Picture by Pim Wolf. An known hybrid, ringed on June 23 1997, offspring of a true male michahellis (ringed orange EAY8) and a female argenteus.
rings argentatus: Germany
adult argentatus in January, ringed on Helgoland, Germany. (75679 bytes)Herring Gull adult X994 (argentatus), August 2003 & 2008, Boulogne/Mer, France (50.43N-01.37E).
rings argentatus: Poland
adult argentatus in August, ringed in Poland. (56194 bytes)Herring Gull DN-083xx adult (argentatus), August 12 2002, Tampere, Finland (61.31N, 23.43E).
rings argentatus: Finland
sub-adult argentatus in August, ringed in Finland. (69470 bytes)Herring Gull C2179 5cy (argentatus), August 11 2002, Tampere, Finland (61.31N,23.43E).
adult argentatus in August, ringed in Finland. (69858 bytes)Herring Gull C2192 5cy (argentatus), August 09 2002, Tampere, Finland (61.31N,23.43E).
sub-adult argentatus in August, ringed in Finland. (39769 bytes)Herring Gull C656R 5cy (argentatus), August 11 2002, Tampere, Finland (61.31N,23.43E).
sub-adult argentatus in August, ringed in Finland. (73415 bytes)Herring Gull C154A 5cy (argentatus), August 12 2002, Tampere, Finland (61.31N,23.43E).
adult argentatus in August, ringed in Finland. (68370 bytes)Herring Gull C156H 5cy (argentatus), August 07 2002, Tampere, Finland (61.31N,23.43E).
adult argentatus in August, ringed in Finland. (39097 bytes)Herring Gull CR47 6cy (argentatus), August 08 2002, Tampere, Finland (61.31N, 23.43E).
adult argentatus in August, ringed in Finland. (59581 bytes)Herring Gull CT57 6cy (argentatus), August 09 2002, Tampere, Finland (61.31N, 23.43E). Note the dark iris yellow legs.
adult argentatus in August, ringed in Finland. (74136 bytes)Herring Gull HT-204151 6cy (argentatus), August 12 2002, Tampere, Finland (61.31N, 23.43E).
adult argentatus in August, ringed in Finland. (67611 bytes)Herring Gull HT-092?72 adult (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E). A yellow-legged Herring Gull.
adult argentatus in August, ringed in Finland. (58893 bytes)Herring Gull HT-xxx adult (argentatus), August 07 2002, Tampere, Finland (61.31N, 23.43E). Note the intense yellow legs.
adult argentatus in August, ringed in Finland. (63310 bytes)Herring Gull HT-xxx adult (argentatus), August 07 2002, Tampere, Finland (61.31N, 23.43E).
adult argentatus in August, ringed in Estonia. (60974 bytes)Herring Gull xx0300 adult (argentatus), August 12 2002, Tampere, Finland (61.31N, 23.43E).
unringed adult Herring Gulls
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 22 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 22 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 20 2012, Katwijk, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull adult (argenteus), August 29 2012, IJmuiden, the Netherlands.
adult argentatus in August. (56348 bytes)Herring Gull adult (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E). Thayeri pattern on P9 and P10, combined with yellow legs.
adult argentatus in August. (55790 bytes)Herring Gull adult (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E). Note the white tongue on P10.
adult argentatus in August. (67090 bytes)Herring Gull adult (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E).
adult argentatus in August. (57513 bytes)Herring Gull adult (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E). Note the thayeri pattern.
adult argentatus in August. (57606 bytes)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.
adult argentatus in August. (67873 bytes)Herring Gull adult (argentatus), August 07 2002, Tampere, Finland (61.31N, 23.43E). Note the intense yellow legs.
adult argentatus in August. (72395 bytes)Herring Gull adult (argentatus), August 09 2002, Tampere, Finland (61.31N, 23.43E).