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.

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.
m (av): Average primary moult score by date.
95% CID: 95% Confidence Interval of the Difference.
SD (s): Standard deviation.

Note 1: by November, adults are selected by the plain grey greater primary coverts, large tips on the new primaries and the lack of immature features (thus limited black on the bill and no obvious pigmentation in the iris).

Note 2: in the summer period, the population Herring Gulls in the harbour of Scheveningen consist of local argenteus. From October onwards, figures are strongly influenced by increasing numbers of Scandinavian argentatus.

Long term analysis for primary moult score (PMS).

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.

rings argenteus: France
ad LBBG in winter, ringed in the Netherlands. (65647 bytes)Herring Gull (argenteus) 5cy HS A November 07 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
rings argenteus: Belgium
adult argenteus in November, ringed in Belgium. (57914 bytes)Herring Gull AAAG adult (argenteus), November 17 2002, Westkapelle, the Netherlands (51.33N 03.25E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull ABAY adult (argenteus), November 20 2005, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull AKAK 8cy (argenteus), November 26 2006, Oostende, Belgium.
sub-adult argenteus in November, ringed in Belgium. (80555 bytes)Herring Gull AVAW 5cy (argenteus), November 15 2003, Westkapelle, the Netherlands (51.33N 03.25E).
adult argenteus in November, ringed in Belgium. (92197 bytes)Herring Gull AXAD adult (argenteus), November 01 2004, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull BHAK 7cy (argenteus), November 20 2005, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull BSAD adult (argenteus), November 20 2005, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull BXAH 7cy (argenteus), November 26 2006, Oostende, Belgium.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull BWAR 7cy (argenteus), November 26 2006, Oostende, Belgium.
adult argenteus in November, ringed in Belgium. (106358 bytes)Herring Gull BYAS adult (argenteus), November 01 2004, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
adult argenteus in November, ringed in Belgium. (93493 bytes)Herring Gull BYAT adult (argenteus), November 01 2004, Westkapelle, the Netherlands (51.33N 03.25E). Picture Pim Wolf.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull BZAH 7cy (argenteus), November 26 2006, Oostende, Belgium
adult argenteus in November, ringed in Belgium. (76291 bytes)Herring Gull CAAU adult (argenteus), November 01 2002, Westkapelle, the Netherlands (51.33N-03.25E).
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull FJAK 5cy (argenteus), November 09 2010, Boulogne/Mer, France. Picture: J-M Sauvage.
adult argentatus in November, ringed in Denmark. (56984 bytes)Herring Gull KYAK adult (argenteus), November 24 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull KY.AV adult, November 19 2013, Boulogne-sur-Mer, France. Picture: Jean-Michel Sauvage.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull NMAB adult (argenteus), November 10 2010, Boulogne/Mer, France. Picture: J-M 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.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-117150 6cy (argenteus), November 26 2006, Oostende, Belgium.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-117289 6cy (argenteus), November 26 2006, Oostende, Belgium.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-117465 5cy (argenteus), November 26 2006, Oostende, Belgium.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-124357 5cy (argenteus), November 26 2006, Oostende, Belgium.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-125344 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-125463 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter. Argentatus on grey tone.
adult argenteus in November, ringed in Belgium. (70458 bytes)Herring Gull H-125585 adult (argenteus), November 16 2002, Westkapelle, the Netherlands (51.33N-03.25E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-128151 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-132217 adult, November 26 2006, Oostende, Belgium. No provenance, ringed on the beach in winter.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Herring Gull H-136635 adult, November 26 2006, Oostende, Belgium.
ad LBBG in winter, ringed in the Netherlands. (65647 bytes)Herring Gull (argenteus) adult H-144089 November 07 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult argenteus in November, ringed in Belgium. (70458 bytes)Herring Gull H-151455 adult (argenteus), November 20 2009, Scheveningen, the Netherlands.
adult argenteus in November, ringed in Belgium. (70458 bytes)Herring Gull BLB H 162877 adult, November 23 2013, Boulogne-sur-Mer, France. Picture: J-M Sauvage.
rings argenteus: the Netherlands
2cy argentatus in November. (81321 bytes)Herring Gull 0.Y adult (argenteus), November 10 2011, Scheveningen, the Netherlands.
adult argentatus in November, ringed in Denmark. (56984 bytes)Herring Gull L0 female (argenteus), November 28 2008, Amsterdam, the Netherlands.
adult argentatus in November, ringed in Denmark. (56984 bytes)Herring Gull PV male (argenteus), November 21 2012, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult argentatus in November, ringed in Denmark. (56984 bytes)Herring Gull L4 6cy (argenteus), November 28 2008, Amsterdam, the Netherlands.
2cy argentatus in November. (81321 bytes)Herring Gull E110 adult (argenteus), November 23 2011, Scheveningen, the Netherlands.
adult argenteus in October, ringed in the Netherlands. (35116 bytes)Herring Gull 5.038.584 adult (argenteus), November 15 2003, Westkapelle, the Netherlands (51.33N 03.25E).
sub-adult argenteus in November, ringed in ther Netherlands. (86160 bytes)Herring Gull 5.334.963 5cy (argenteus), November 15 2003, Westkapelle, the Netherlands (51.33N 03.25E).
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull argenteus 13CY NLA 5.352.687 November 26 2013, Katwijk aan Zee, the Netherlands.
2cy argentatus in November. (81321 bytes)Herring Gull 11cy 5.352.700 (argenteus), November 23 2011, Scheveningen, 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.5.424.838 adult (argenteus) November 19 2009, IJmuiden, the Netherlands.
2cy argentatus in November. (81321 bytes)Herring Gull Eadult (argenteus), November 10 2011, Scheveningen, the Netherlands.
rings argentatus: Denmark
adult argentatus in November, ringed in Denmark. (56984 bytes)Herring Gull V173 adult (argentatus), November 17 2002, Westkapelle, the Netherlands (51.33N-03.25E).
adult argentatus in November, ringed in Denmark. (66854 bytes)Herring Gull 4132037 adult (argentatus), November 01 2002, Westkapelle, the Netherlands (51.33N-03.25E).
rings argentatus: Norway
adult argenteus in November, ringed in Belgium. (57914 bytes)Herring Gull JCG4 adult (argentatus), November 04 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
adult argentatus in November, ringed in Norway. (46759 bytes)Herring Gull 365231 adult (argentatus), November 16 2002, Westkapelle, the Netherlands (51.33N-03.25E).
rings argentatus: Finland
1cy argenteus in November, ringed in Belgium. (25637 bytes)Herring Gull SFH HT082209 25cy (argentatus), November 2003 & December 2008, Westkapelle, the Netherlands (51.33N - 03.25E). Picture Pim Wolf.
rings argentatus: Estonia
adult argentatus in November, ringed in Estonia. (42082 bytes)Herring Gull T55420 adult (argentatus), November 17 2003, Westkapelle, the Netherlands. Picture Norman van Swelm.
adult argentatus in November, ringed in Estonia. (42082 bytes)Herring Gull 7C adult (argentatus), November 06 2004, Westkapelle, the Netherlands. Picture Pim Wolf.
unringed adult Herring Gulls
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. Much black on bill. Limited black in wing-tip.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. Much black on bill. No black on P5.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argentatus), November 20 2012, Katwijk, the Netherlands. No black on P5.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull (argentatus) adult, November 26 2013, Katwijk aan Zee, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull (argentatus) adult, November 26 2013, Katwijk aan Zee, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)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.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. Black on outerweb of P5.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P10 growing.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P9-P10 growing. Black on P4.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult (argenteus), November 20 2012, Katwijk, the Netherlands. P10 growing. No black on P5.
2cy argenteus in March, ringed in France. (57822 bytes)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.
2cy argenteus in March, ringed in France. (57822 bytes)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.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult, November 20 2012, Katwijk, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult, November 20 2012, Katwijk, the Netherlands. Much black on bill. Full band on P5.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult, November 20 2012, Katwijk, the Netherlands.
2cy argenteus in March, ringed in France. (57822 bytes)Herring Gull adult, November 20 2012, Katwijk, the Netherlands. Much black on bill.
adut argentatus in November. (56023 bytes)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.
adut argentatus in November. (74314 bytes)Herring Gull adult (argentatus), November 17 2002, Westkapelle, the Netherlands (51.33N-03.25E). A yellow-legged individual from the Baltic region.
adut argentatus in November. (129647 bytes)Herring Gull adult (argentatus), November 11 1991, Worcestershire, Britain. Photograph by Peter Stewart.
adut argentatus in November. (50944 bytes)Herring Gull adult (argentatus), November 17 2002, Westkapelle, the Netherlands (51.33N-03.25E). Another typical yellow-legged individual from the Baltic region
adut argentatus in November. (49012 bytes)Herring Gull adult (argentatus), November 16 2002, Westkapelle, the Netherlands (51.33N-03.25E).