Herring Gull- Zilvermeeuw (argentatus & argenteus)

(last update: December 15, 2011 )

Herring Gull - 1cy 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".

 

1cy Herring Gull: description for August

In juvenile plumage, the head and under-parts are streaked grey-brown, rather pale on forehead and throat and with dark ear-coverts. The mantle and scapulars are brown based with buffish-yellowish fringes when the feathers are fresh. The notched pattern is repeated on the lesser, lower lesser and median coverts, although the medians often have paler centres. The greater coverts show a 'piano-key' pattern, obvious on the outer greater coverts as well in western populations (British argenteus). Some 1cy argentatus (e.g. this argenteusand this argentatus) may have the outer greater coverts with extensive dark centres, lacking obvious notching and thin fringes on the tertials, like in michahellis. On average, the tertials have an obvious notched pale fringe and transversal bar. Again, this is more pronounced in argenteus than in argentatus. The secondaries, primaries and primary coverts are dark with a small white tip, but the inner primaries show an obvious, sometimes translucent, pale window, prominent from below and above. The under-wing is rather uniform grey-brown patterned. The tail has a broad sub-terminal band and isolated dark bars on the basal half. Some argentatus show a broken tail-band, reminiscent to Great Black-backed Gull (L. marinus). The iris is very dark, the bill is blackish, sometimes with a paler base, and the legs are flesh-pink with dark shins.

1cy Herring Gull: post-juvenile moult

The partial autumn moult (moult into so-called "first winter" plumage) includes the body and head feathers. This moult starts as soon as the nest is abandoned (especially in southern populations) and continues until January. Early argenteus juveniles fledge by late-June in the Netherlands, argentatus fledge mid-July in northern USSR. The post-juvenile moult is most extensive in southern Herring Gull populations. Northern juvenile argentatus may postponed the post-juvenile moult until February, hence retain a juvenile plumage (e.g. this Russian 2cy argentatus in February).
In the post-juvenile moult, the head turns paler on throat and forehead. The breast turns paler as well, but most is an effect of bleaching and wear. The feathers on belly and vent remain juvenile in most 1cy argenteus by November. 
From 1cy July onwards, the mantle and upper scapulars may be moulted to second generation feathers, showing an anchor pattern and a dark base. When the feathers are fresh, they may show warm ginger tones, but after a few weeks these warm tones bleach paler, to white later in the season. In 2cy argenteus in NW France (from Belgian, Dutch and British populations), the lowest row of scapulars are still juvenile by 2cy March in the vast majority of birds (contra e.g. the southern taxon michahellis). Both argenteus and argentatus normally exclude all tertials and wing-coverts from the post-juvenile moult. However, we estimate 2-4% of argenteus to include one or a few wing-coverts or a single tertial in the post-juvenile moult (often in a later stage of this moult, when scapular moult is well underway). We don't have sufficient data to estimate for argentatus, but several pictures show this phenomenon in argentatus as well. The juvenile wing-coverts, rectrices and remiges start to bleach and show wear in the fringes from 1cy September onwards.

Most 1cy argenteus and argentatus from S-Scandinavia do not start the post-juvenile moult before the end of the month. Below, we included a table of 23 ringed Herring Gull, of which 9 started the post-juvenile moult before 15 August (about 40%). Most advanced birds have over 10 (small) upper scapulars and mantle feathers replaced. In these birds, active moult is obvious by the large moult gaps, showing the bases of the underlying feathers. 

Herring Gulls (Larus argentatus argenteus) at IJmuiden, the Netherlands

Read more about the location: IJmuiden.
Observations of ringed birds can be sent to Kees Camphuysen at NIOZ, Texel (mail camphuys at nioz dot nl). Click the Excel logo for the life history of Herring Gull Y.AAK and find the report of earlier sightings.
Read more about the 2007 ring activities by Fred Cottaar & Kees Verbeek on Forteiland, IJmuiden. (Word document 4,5Mb, in Dutch with tables and plots)
Read more on the NIOZ website about ringing projects on Texel, Vlieland, Leiden and the Dutch delta administrated by Kees Camphuysen.
Read more about the history of ringing programmes in Holland and the results throughout the years. An article prepared for the magazine Sula by Kees Camphuysen (in Dutch, with English summary; PDF-file 1160 Kb).

The IJmuiden Ringing Team (Fred Cottaar & Kees Verbeek) have ringed Herring Gulls and Lesser Black-backed Gulls at Forteiland, IJmuiden in 2008-2010. This time green darvic rings have been attached, starting with Y for both species (so codes read Y.xxx).
Early in the season of 2008, 44 adult Lesser Black-backed Gulls and 16 Herring Gulls were caught at the nests and ringed. Late June 2008 about 35 juveniles (of both species) were caught and ringed as well by Fred and Kees.

The pages on this website show examples of birds from this IJmuiden project. All observations of ringed birds from these projects can be sent to Kees Camphuysen at NIOZ, Texel (mail camphuys at nioz dot nl). By clicking the thumbnails right, you will find enlarged pictures of these birds. By clicking the Excel logo (right box) you will find an example Excel Sheet with the reports of earlier sightings of adult Herring Gull Y.AAK from the excel database, as will be sent to you after reporting rings to Kees Camphuysen.

Forteiland - IJmuiden.

Many Herring and Lesser Black-backed Gulls used to breed along the coast in the dunes, but nowadays most are roof-top breeding birds. Buildings with adequate roof-tops in the fish-industry complex of IJmuiden have been occupied, and recently gulls are spreading to roof-tops in cities as well. The change in breeding habitat has much to do with predation of Red Fox in the dunes.

Forteiland (see picture) is an isle where the Fox was not found in the 1980's. Up to 1988 the colony increased but then, in the breeding season of 1988, one Fox managed to reach this island. Apparently, gulls have good memories as the island was abandoned for 15 years; it lasted to 2003 when finally the island was occupied by gulls again. In 2007, number of breeding pairs approximately levels numbers in 1988. However, Lesser Black-backed Gull has now become the common species, while this used to be Herring Gull in the 1980's.

Nowadays, Forteiland is the last place where ground breeders can be found at IJmuiden. Due to construction works and disturbance of some colonies, the importance of the Forteiland colony is growing. From 2003, numbers of breeding birds increase annually. Ring recoveries show birds arrive from other colonies in IJmuiden, but also from Moerdijk, Maasvlakte and Texel. For the next years, more construction works are planned in IJmuiden harbour, e.g. for the Middensluis Complex, unfortunately hosting a large colony of both Herring and Lesser Black-backed Gulls. Hence, for the coming years it is expected many more gulls will search for new nesting areas, and will find their way to Forteiland.

1cy Herring Gull August: tables

Table 1: Scapular and wing-covert moult scores for ringed 1cy Herring Gulls in August. n=72.

CODE RING TAXON DATE DAY SIDE TT & COVS 2g TOTAL
# US LS SCAPS
NLA YALA TEUS 3-aug 34 L+R 0 0 0 0
NOS J7275 TATUS 3-aug 34 R 0 0 0 0
SFH C268Y TATUS 6-aug 37 L 0 0 0 0
SFH HT-222865 TATUS 6-aug 37 R 0 1 1 1
SFH HT-2XXX33 TATUS 6-aug 37 L 0 1 0 1
SFH C198U TATUS 7-aug 38 R 0 0 0 0
SFH C9V59 TATUS 7-aug 38 R 0 1 0 1
NLA KWAZ TEUS 8-aug 39 R 0 0 0 0
SFH C8J87 TATUS 8-aug 39 L 0 0 0 0
SFH C280P TATUS 9-aug 40 L 0 0 0 0
SFH C211J TATUS 10-aug 41 L 0 0 0 0
SFH C272P TATUS 10-aug 41 L 0 1 0 1
SFH C9V40 TATUS 10-aug 41 L 0 1 0 1
FRP PEA TEUS 11-aug 42 L 0 0 0 0
SFH C265H TATUS 11-aug 42 L 0 0 0 0
SFH C266U TATUS 11-aug 42 nn 0 0 0 0
SFH C9C37 TATUS 11-aug 42 L 0 0 0 0
SFH C9H66 TATUS 11-aug 42 nn 0 0 0 0
SFH C9S27 TATUS 11-aug 42 nn 0 1 1 1
NLA 6125999 TEUS 12-aug 43 L+R 0 0 0 0
SFH C167K TATUS 12-aug 43 R 0 0 0 0
SFH HT-229068 TATUS 12-aug 43 nn 0 E F E
DEH RW-HX09 TATUS 13-aug 44 R 0 0 0 0
NLA YAMF TEUS 13-aug 44 L 0 0 0 0
BLB H-128369 TEUS 15-aug 45 nn 0 1 0 1
BLB H-131183 TEUS 15-aug 45 nn 0 0 0 0
BLB H-131304 TEUS 15-aug 45 R 0 1 0 1
NLA BW-V6 TEUS 14-aug 45 R 0 0 0 0
NLA YAFC TEUS 14-aug 45 R 0 1 0 1
NLA YARD TEUS 14-aug 45 L 0 0 0 0
SVS DA 53945 TATUS 14-aug 45 L 0 0 0 0
NLA 5X86641 TEUS 15-aug 46 nn 0 0 0 0
NLA YB-UW TEUS 15-aug 46 R 0 0 0 0
NLA RW-JA TEUS 16-aug 47 R 0 0 0 0
NLA YBXL TEUS 18-aug 49 R 0 1 0 1
NLA YBXL TEUS 18-aug 49 L 0 0 0 0
NLA YACY TEUS 20-aug 51 R 0 1 0 1
NLA ZY-TS TEUS 21-aug 51 R 0 0 0 0
BLB PYAY TEUS 21-aug 52 L 0 0 0 0
FRP KKA TEUS 22-aug 53 R 0 0 0 0
NLA 5511003 TEUS 22-aug 53 L+R 0 0 0 0
NLA GW-XV TEUS 22-aug 53 L 0 0 0 0
NLA YBXL TEUS 22-aug 53 R 0 1 0 1
NLA 5416882 TEUS 23-aug 54 R 0 1 1 1
NLA 5422338 TEUS 23-aug 54 L 0 0 0 0
NLA PCHU TEUS 23-aug 54 L 0 0 0 0
NLA YACU TEUS 23-aug 54 R 0 0 0 0
NLA YADH TEUS 23-aug 54 L+R 0 0 0 0
NLA YADJ TEUS 23-aug 54 R 0 1 0 1
NLA YAFJ TEUS 23-aug 54 L+R 0 0 0 0
NLA YBWF TEUS 23-aug 54 R 0 1 1 1
NOS J8228 TATUS 23-aug 54 L 0 1 0 1
NOS J8267 TATUS 23-aug 54 R 0 0 0 0
DEH YB-H57P TATUS 24-aug 55 L 0 0 0 0
NLA 5429056 TEUS 24-aug 55 L 0 0 0 0
NLA 5429070 TEUS 24-aug 55 L 0 0 0 0
NLA 5463317 TEUS 25-aug 56 L+R 0 0 0 0
NLA 5463357 TEUS 25-aug 56 R 0 0 0 0
NLA 5463365 TEUS 25-aug 56 R 0 0 0 0
NLA YAZF TEUS 25-aug 56 R 0 1 0 1
BLB H901XX9 TEUS 26-aug 57 L 0 1 0 1
BLB PLAW TEUS 26-aug 57 R 0 0 0 0
BLB YLAJ TEUS 26-aug 57 L 0 0 0 0
NLA 5429070 TEUS 26-aug 57 R 0 0 0 0
NLA BW-V6 TEUS 27-aug 58 L 0 0 0 0
NLA YACW TEUS 27-aug 58 L 0 0 0 0
BLB CYAH TEUS 28-aug 59 L 0 2 0 1
BLB MRAU TEUS 28-aug 59 L 0 1 0 1
BLB H901625 TEUS 30-aug 61 R 0 1 0 1
BLB YTAV TEUS 30-aug 61 L 0 0 0 0
NLA 5429210 TEUS 30-aug 61 R 0 0 0 0
NLA YALB TEUS 31-aug 62 R 0 1 1 1
NLA 5429070 TEUS 1-sep 63 L+R 0 0 0 0
NLA 5463357 TEUS 3-sep 65 L 0 0 0 0
NLA 5463365 TEUS 3-sep 65 R 0 0 0 0
post-juvenile moult score of ringed L. argentatus argentatus and argenteus. Code:
FRP - France
BLB - Belgium
NLA - Netherlands
DEH - Germany
NOS - Norway
SVS - Sweden
Side scored: L - left; R - right; nn - not noted.
TT & COVS: moult score in tertials and wing-coverts.
2g US: second generation upper scapulars; LS: lower scapulars. TOTAL SCAPS: % of 2nd gen scapulars.
Classification:
0 - 0% 2nd gen scaps
1 - 1-25%
2 - 25-50%
3 - 50-75%
4 - 75-99%
5 - 100% 2nd gen scaps

Table 2: Scapular moult scores for ringed 1cy August Herring Gulls. 

.
u.s.
l.s.
tot.scaps.
.
taxon
0%
1-25%
25-50%
0%
1-25%
0%
1-25%
total
argentatus
15
8
0
21
2
15
8
23
argenteus
34
14
1
45
3
34
15
49


Scatterplot above: % moult score in total scapular region plotted against date for the month August (01 July = day 1). Data from 1st table (above).
1 = taxon argentatus (S Finland, Sweden); 2 = taxon argenteus (Belgium, the Netherlands).

 

 

rings argenteus: France
Herring GullHerring Gull KKA, 1cy (argenteus), August 22 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
Herring GullHerring Gull PEA, 1cy (argenteus), August 11 2008, Boulogne/Mer, France (50.42N,1.34E). Picture: J-M Sauvage.
rings argenteus: Belgium
1cy argenteus in November, ringed in Belgium. (25637 bytes)Herring Gull CYAH 1cy (argenteus), August 28 2009, Westkapelle, the Netherlands.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Herring Gull MRAU 1cy (argenteus), August 28 2009, Westkapelle, the Netherlands.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Herring Gull PLAW 1cy (argenteus), August 26 2010, Westkapelle, the Netherlands.
2cy argenteus in March, ringed in Belgium. (63421 bytes)Herring Gull (argenteus) PYAY 1CY, August 21 2010, Nieuwpoort, Belgium. Picture: Peter Adriaens.
Herring GullHerring Gull (argenteus) 1CY YLAJ August 26 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
Herring GullHerring Gull (argenteus) YTAV 1CY, August 30 2013, Le Portel, France. Picture: Jean-Michel Sauvage.
1cy argentatus in August, ringed in Finland. (93512 bytes)Herring Gull H-901625 1cy (argenteus), August 30 2010, Westkapelle, the Netherlands.
1cy argentatus in August, ringed in Finland. (93512 bytes)Herring Gull H-901xx9 1cy (argenteus), August 26 2010, Westkapelle, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull H-131304 1cy (argenteus), August 15 2003, Westkapelle, the Netherlands (51.33N, 03.25E).

rings argenteus: the Netherlands

1cy argenteus in September (65624 bytes)Herring Gull (argenteus) 1cy T.S August 21 2013, Katwijk, the Netherlands.
Herring GullHerring Gull (argenteus) V6 August 14-27 2013, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
3cy argenteus in March, ringed in Belgium. (61218 bytes)Herring Gull (argenteus) UW 1CY, August 15 2008, Nieuwpoort, Belgium. Picture: Peter Adriaens. 
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) JA 1cy, August 16 2009, Westkapelle, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) X.V 1cy, August 22 2012, Katwijk, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ACU 1cy, August 23 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ACW 1CY & 7CY, August 2008 & May 2014, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee & Mars Muusse.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ACY 1cy, August 20 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ADH 1CY & 6CY, August 2008 & June 2013, IJmuiden-Noordwijk, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ADJ 1cy, August 23 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.AFC 1cy, August 14 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.AFJ 1CY & 3CY, August 20-23 2008 & October 27 2010, IJmuiden & Westkapelle, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ALA 1cy, August 03 2009, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ALB 1cy, August 31 2009, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.AMF 1cy, August 13 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.ARD 1cy, August 14 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.AZF 1CY & 3CY, August 2011 & April 2013, IJmuiden & Brouwersdam, the Netherlands.
2cy argentatus in February, ringed in Norway. (75189 bytes)Herring Gull (argenteus) Y.BLN 1CY, August 11 2013, IJmuiden, the Netherlands. Picture: Maarten van Kleinwee.
2cy argentatus in February, ringed in Norway. (75189 bytes)Herring Gull (argenteus) Y.BMD 1CY-4CY, August 2013 - April 2016, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.BWF 1CY, August 23 2015, IJmuiden, the Netherlands (52.27N 04.33E). 
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.BXL 1CY, August & December 2015, IJmuiden, the Netherlands (52.27N 04.33E).
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) Y.CDN 1CY, August 21 2016, Katwijk, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) K.WAZ 1cy, August 08 2010, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull (argenteus) P.CHU 1cy, August 23 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.416.882 1cy (argenteus), August 23 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.422.338 1cy (argenteus), August 20 & 23 2008, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.429.056 1cy (argenteus), August 24 2010, Neeltje Jans, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.429.070 1cy (argenteus), August 24-26 2010, Neeltje Jans, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.429.210 1cy (argenteus), August 30 2010, Neeltje Jans, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.463.317 1cy (argenteus), August 25 2011, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.463.357 1cy (argenteus), August 25 2011, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in Belgium. (90559 bytes)Herring Gull 5.463.365 1cy (argenteus), August 25 2011, IJmuiden, the Netherlands.
1cy argenteus in August, ringed in the Netherlands. (89062 bytes)Herring Gull (argenteus) NLA 5.511.003 1CY, August 22 2015, IJmuiden, the Netherlands (52.27N 04.33E). 
1cy argenteus in August, ringed in the Netherlands. (89062 bytes)Herring Gull 6.125.999 1cy (argenteus), August 12 2004, Brouwersdam, the Netherlands.
1cy argenteus in August, ringed in the Netherlands. (89062 bytes)Herring Gull (argenteus) NLA 6.178.499 1CY, Agust 19 2016, Boulogne-sur-Mer, NW France. Picture: Jean-Mchel Sauvage.
rings argentatus: Germany
1cy argentatus in August, ringed in Finland. (93512 bytes)Herring Gull H.X09 1cy (argentatus), August 13 2010, IJmuiden, the Netherlands.
1cy argentatus in August, ringed in Finland. (93512 bytes)Herring Gull H57P 1cy (argentatus), August 24 2010, Westkapelle, the Netherlands.
rings argentatus: Norway
1cy argentatus in August, ringed in Sweden. (67561 bytes)Herring Gull (argentatus) J7275 1CY, August 03 2014, Sandøya, Norway. Picture: Ingar Støyle Bringsvor.
1cy argentatus in August, ringed in Sweden. (67561 bytes)Herring Gull (argentatus) J8228 1CY, August 23 2014, Oslo, Norway. Picture: Ingar Støyle Bringsvor.
1cy argentatus in August, ringed in Sweden. (67561 bytes)Herring Gull (argentatus) J8267 1CY, August 23 2014, Oslo, Norway. Picture: Ingar Støyle Bringsvor.
rings argentatus: Sweden
1cy argentatus in August, ringed in Sweden. (67561 bytes)Herring Gull DA 53945 1cy (argentatus), August 14 2002, Gotenborg, Sweden.
rings argentatus: Finland
1cy argentatus in August, ringed in Finland. (93512 bytes)Herring Gull C167K 1cy (argentatus), August 12 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (74366 bytes)Herring Gull C198U 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (85943 bytes)Herring Gull C211J 1cy (argentatus), August 09 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (71800 bytes)Herring Gull C265H 1cy (argentatus), August 08 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (76157 bytes)Herring Gull C268Y 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (88543 bytes)Herring Gull C272P 1cy (argentatus), August 10 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (59965 bytes)Herring Gull C280P 1cy (argentatus), August 09 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (81022 bytes)Herring Gull C8J87 1cy (argentatus), August 10 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (72709 bytes)Herring Gull C9C37 1cy (argentatus), August 11 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (82920 bytes)Herring Gull C9V40 1cy (argentatus), August 10 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (90069 bytes)Herring Gull C9V59 1cy (argentatus), August 07 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (75649 bytes)Herring Gull HT-222865 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August, ringed in Finland. (63788 bytes)Herring Gull HT-2xxx33 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).
unringed 1cy Herring Gulls
1cy argentatus in August. (62968 bytes)Herring Gull 1cy (argentatus), Simrishamn, Sweden, August 19 2008. Picture: Hans Larsson.
1cy argentatus in August. (62968 bytes)Herring Gull 1cy (argentatus), Simrishamn, Sweden, August 14 2010. Picture: Hans Larsson.
1cy argenteus in August (79569 bytes)Herring Gull (argenteus) 1CY, August 21 2013, Katwijk, the Netherlands. 
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands. Some 2nd gen coverts.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (79569 bytes)Herring Gull argenteus 1CY, August 23 2016, Katwijk, the Netherlands.
1cy argenteus in August (80983 bytes)Herring Gull 1cy (argenteus), August 18 2001, Dintelhaven - Maasvlakte, the Netherlands (51.58N-04.02E).
Herring GullHerring Gull 1cy (argenteus), August 20 2012, Katwijk, the Netherlands.
1cy argentatus in August. (53708 bytes)Herring Gull 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N, 23.43E).
1cy argentatus in August. (94231 bytes)Herring Gull 1cy (argentatus), August 06 2002, Tampere, Finland (61.31N,23.43E).
1cy argentatus in August. (82031 bytes)Herring Gull 1cy (argentatus), August 09 2002, Tampere, Finland (61.31N, 23.43E).
1cy argentatus in August. (71124 bytes)Herring Gull 1cy (argentatus), August 10 2002, Tampere, Finland (61.31N, 23.43E).
1cy argentatus in August. (62968 bytes)Herring Gull 1cy (argentatus), August 14 2002, Gotenborg, Sweden.
1cy argentatus in August. (58288 bytes)Herring Gull 1cy (argentatus), August 14 2002, Gotenborg, Sweden.
1cy argentatus in August. (67310 bytes)Herring Gull 1cy (argentatus), August 14 2002, Gotenborg, Sweden.