Lesser Black-backed Gull (graellsii & intermedius)

(last update: 14-11-2017 )

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lbbg 2cy January
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lbbg 3cy January
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lbbg adult January
lbbg adult February
lbbg adult March
lbbg adult April
lbbg adult May
lbbg adult June
lbbg adult July
lbbg adult August
lbbg adult September
lbbg adult October
lbbg adult November
lbbg adult December

adult: May


Lesser Black-backed Gull adult, May 09 2014, Katwijk, the Netherlands. Classic graellsii type bird. Complete moult not started: P1-P10 old.

Many photographs were taken at two colonies at the Maasvlakte (51'56 N 04'00 E). The Maasvlakte, situated along the Dutch North Sea coast near Rotterdam, is a large harbour complex (see the maps in the distribution section). The vacant sites, not occupied by industrial companies, accommodate large colonies of Lesser Black-backed Gulls (LBBG) and Herring Gulls (HG).

Mixed breeding

Dutch LBBG colonies are probably a result of colonization by both intermedius (from Scandinavia) and graellsii (from Great-Britain) during the 1930s, and are often referred to as 'Dutch intergrades'. It is not unlikely that "Herring Gull blood" is involved as well, as mixed breeding between HG and LBBG was not uncommon during the early colonization period (yet, for the last decades these mixed pairs are not seen). From the 1990's, mixed pairs with michahellis can be found annually.

Nowadays ringed adults from several foreign colonies can be found within the Maasvlakte colony. Mixed breeding does occur with Yellow-legged Gulls (about 10 mixed pairs annually), resulting in mixed characteristics and therefore making identification in some birds pretty hard. An example of such a mixed couple can be found on this page, the birds were photographed in April and May 2002. A male Lesser Black-backed Gull has paired with a female Yellow-legged Gull. Some birds have the upper-parts a shade of grey paler than normally seen in LBBG, and when this is combined with other features as an orange orbital ring, one may expect some Herring Gull influences.

Location of breeding

As can be seen in the images, adult birds are very strict in choosing a place in the colony. Research in Herring Gulls (in the Netherlands by H. Vercruijsse) revealed that almost all sub-adult Herring Gulls visited the colony of birth at least once in their life to investigate the possibilities for nesting in later years. In their third year, Herring Gulls (but Lesser Black-backed Gulls as well) can be found in the colonies on an extensive scale. Every colony holds at least a few immature birds, any time in the breeding season. It's not said that they will breed there in later years, they might just be on investigation to find out whether it will be a profitable decision. Once the breeding site is chosen, adults are very strict in returning to this site in future.

Primary Moult Scores in adult LBBG:

Year 2003 we did some preliminary research on primary moult scores in adult LBBG. In total, we scored about 1400 birds from early April to mid October. This research will be used to do some more fundamental research in tear 2003-2004. First results for May can be read from the tables below. Most birds had P1 still present, but from late May onwards, adult LBBG increasingly shed P1. The last survey is from Zeebrugge, May 30 with most advanced bird missing P1 and P2 (score 8, in metal ringed L-62174 and orange EX22, ringed July 03 1997, now in 7cy). Nevertheless we did see several adult LBBG in the colony, which had P1 shed by April 19. Some notes: the scorse on April 05 2003 were done at Naaktstrand, on preening, bathing and arriving birds, through 20x-60x telescopes. Active moult would be noticed, but to detect arrested moult in such circumstances is pretty difficult. Next year, we try to start our surveys with catching birds and examine the exact primary stage in the inner primaries by taking photographs.


Lesser Black-backed Gull adult, May 09 2014, Katwijk, the Netherlands. Classic graellsii type bird. Complete moult started: P1 growing, P2-P10 old.

Above: 2015. Below: 2014.
Calais port services started to store materials and equipment on the Larus fuscus colony at the quay of the Loire in Calais. Some gulls (like orange OV, ringed the Netherlands and many more birds) are deprived from the location they occupied for so many years.
Already last year, a bulldozer destroyed some nests near the railway. At this location, quay of the Loire at Calais, about 200 Larus fuscus pairs breed (impossible to have a clear idea because of Buddleia grows on the railway).

Tables & Graph

starting date: 30 Apr   07 May   14 May   21 May   28 May   04 Jun
week no: 18 19 20 21 22 23
REM 0 0 0 0 0 0 0
REM 1 0 0 0 0 0 0
REM 2 0 0 0 0 0 0
REM 3 0 0 0 0 0 0
REM 4 0 0 0 0 0 0
REM 5 0 0 0 0 0 0
REM 6 0 0 0 0 0 0
REM 7 0 0 1 0 0 0
REM 8 15 11 21 9 5 3
REM 9 40 34 39 15 12 6
REM 10 466 216 194 85 102 17
           
n = 521 261 255 109 119 26
average P = 9.9 9.8 9.7 9.7 9.8 9.5
95% CID = 0.04 0.06 0.08 0.12 0.09 0.29
inverse = 1.96 1.97 1.97 1.98 1.98 2.06
Variantie (s2) = 0.17 0.25 0.41 0.38 0.24 0.50
SD (s) = 0.42 0.50 0.64 0.62 0.49 0.71
SE (sx) = 0.02 0.03 0.04 0.06 0.04 0.14
             
% class:            
0 0 0 0 0 0 0
1 0 0 0 0 0 0
2 0 0 0 0 0 0
3 0 0 0 0 0 0
4 0 0 0 0 0 0
5 0 0 0 0 0 0
6 0 0 0 0 0 0
7 0 0 0 0 0 0
8 3 4 8 8 4 12
9 8 13 15 14 10 23
10 89 83 76 78 86 65
             
  % control: 100 100 100 100 100 100

Table above, data for the Netherlands (2000-2010), results for May (aggregated week): number of remaining old primaries in adults.
REM10 = 10 primaries still old (hence, complete moult not started yet). First signs of complete moult commencement in WEEK 18 (starting 30 April).

Above: Scatter Plot for PMS in adult Lesser Black-backed Gulls. Number of remaining old primaries throughout the year (arrested moult excluded). Sample size is 6.171 birds.

Above: Scatter Plot for PMS in adult Lesser Black-backed Gulls. Number of remaining old primaries for May (arrested moult excluded). Sample size for this graph is 1291 ringed birds.

starting date:

30 Apr

07 May

14 May

21 May

04 Jun

week no:

18

19

20

21

23

NEW 0

457

205

207

92

8

NEW P1

10

3

10

4

0

NEW P2

3

1

2

0

0

NEW P3

0

0

0

0

0

NEW P4

0

0

0

0

0

NEW P5

0

0

0

0

0

NEW P6

0

0

0

0

0

NEW P7

0

0

0

0

0

NEW P8

 

0

0

0

0

NEW P9

 

 

0

0

0

NEW P10

 

 

 

 

0

 

 

 

 

 

 

n =

470

209

219

96

8

average NEW P =

0.0

0.0

0.1

0.0

0.0

95% CID =

0.02

0.02

0.04

0.04

0.00

inverse  =

1.97

1.97

1.97

1.99

2.36

Variantie (s2) =

0.05

0.03

0.08

0.04

0.00

SD (s) =

0.21

0.18

0.28

0.20

0.00

SE (sx) =

0.01

0.01

0.02

0.02

0.00

 

 

 

 

 

 

% class

 

 

 

 

 

0

97

98

95

96

100

1

2

1

5

4

0

2

1

0

1

0

0

3

0

0

0

0

0

4

0

0

0

0

0

5

0

0

0

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

 

 

 

 

 

 

% control:

100

100

100

100

100

Table above, data for the Netherlands (2000-2010), results for May (aggregated week): number of new, fully grown primaries in adults.
NEW0 = no new primaries visible (arrested moult excluded in this analysis). So either P1 still old, or P1 dropped, but the very tip still not visible.
NEW1 = P1 longest new primary. Range between "at least the tip of P1 is visible" until "tip of P2 still shorter than P1".
NEW2 = P2 longest new primary. NEW3 = etc.

Above: Scatter Plot for PMS in adult Lesser Black-backed Gulls throughout the year. Longest new primary is classified "fully grown". Sample size is 2.969 birds. Birds scored on NEW primaries (arrested moult excluded).

Above: Scatter Plot for PMS in adult Lesser Black-backed Gulls. Scoring on longest new primary, which is classified "fully grown" for May (arrested moult excluded). Sample size for this graph is 1002 ringed birds.

The earliest date for birds with missing primaries is 30 April 2006, which is not the earliest day in our complete sample. We scored 98 Lesser Black-backed Gulls prior to that date, some already in February. As can be expected, none of these was in primary moult, and this group was excluded in our further analysis as it will only result in a misfit for the onset of moult, using linear regression statistics.

The last scoring days were in November, with a larger sample (133 adults) on 04 November 2010. From that date we have the last birds with retaining old primaries (13 birds with 1, 2 or even 3 old primaries; 120 birds with no old primaries left). From other days in November, only 10 birds were scored (all ringed adults). They all had no old primaries left.

The first tine a new primary (P1) was visible, was on 08 May 2006. Prior to this date, birds were scored missing inner primaries, but the very tip was still not visible (and therefore not scored). As soon as the tip of P1 was visible, this was automatically scored "fully grown" 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).

Peter Stewart presents onset of primary moult by scores for caught adult Lesser Black-backed Gulls in the Severn Estuary, U.K., repeated in the table below. To read his results, see this PDF file.  

Table: the number of old remaining primaries present. Compare PMS of adult graellsii at half monthly intervals. Data from the Severn Estuary Gull Group by Peter Stewart: The primary moult of the Lesser Black-backed Gull (special publication No 1).

 

Netherlands

Severn Estuary U.K.

 

PMS range

N:

Average PMS

PMS range

N:

Average PMS

1-15 apr

10

49

10

8-10

216

9,9

16-30 apr

10

47

10

10

197

10,0

1-15 may

8-10

849

9,8

8-10

167

9,9

16-31 may

7-10

380

9,7

7-10

76

9,5

1-15 jun

8-10

104

9,6

7-10

33

8,6

16-30 jun
7-10 253 9,7 6-10 65 8,2
1-15 jul
6-10 605 9,2 5-10 176 7,4

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 = 6171, R2= 0.820, sign: P<0,000)
PMS = -0,381* WEEK + 17,967

Ringed adults: Linear regression (n = 2069, R2= 0.800, sign: P<0,000)
PMS = -0,325* WEEK + 16,270

Unringed adult: Linear regression (n = 4102, R2= 0.779, sign: P<0,000)
PMS = -0,513* WEEK + 23,031

LINEAR REGRESSION FOR NEW FULLY GROWN PRIMARIES

Complete sample: Linear regression (n = 2969, R2= 0.930, sign: P<0,000)
PMS = 0,302* WEEK - 5,933

Ringed adults: Linear regression (n = 1209, R2= 0.888, sign: P<0,000)
PMS = 0,252* WEEK - 4,747

Unringed adult: Linear regression (n = 1760, R2= 0.833, sign: P<0,000)
PMS = 0,442* WEEK - 11,90


Lesser Black-backed Gull adult, May 08 2016, Nieuw-Haamstede, the Netherlands. Classic graellsii type bird. Complete moult not started: P1-P10 old.

Primary Moult Scores in ringed (near)adult LBBG at Zeebrugge Voorhaven, Belgium in May. Date: 03, 29 & 30 May 2003.
code ring RPS date code ring RPS date
L-???69 BLB 10 30-mei-03 BLAD BLUE 10 29-mei-03
L-?0919 BLB 10 03-mei-03 BLAD BLUE 10 30-mei-03
L-?8648 BLB 10 30-mei-03 BLAH BLUE 10 03-mei-03
L-39830 BLB 10 30-mei-03 BLAR BLUE 10 30-mei-03
L-48364 BLB 10 29-mei-03 BMAA BLUE 10 29-mei-03
L-62174 BLB 10 03-mei-03 BMAF BLUE 10 30-mei-03
L-62174 BLB 8 30-mei-03 BMAZ BLUE 10 03-mei-03
L-65126 BLB 10 30-mei-03 BMAZ BLUE 10 29-mei-03
L-809?? BLB 10 29-mei-03 BMAZ BLUE 10 30-mei-03
L-80919 BLB 10 30-mei-03 BNAC BLUE nn 03-mei-03
L-82??? BLB 10 03-mei-03 BNAH BLUE 10 03-mei-03
L-82711 BLB 10 30-mei-03 BNAH BLUE 10 30-mei-03
L-83405 BLB 10 30-mei-03 BNAR BLUE 10 03-mei-03
L-877?? BLB 10 30-mei-03 BNAR BLUE 10 29-mei-03
L-89082 BLB 10 03-mei-03 BPAL BLUE 10 03-mei-03
L-89427 BLB 10 29-mei-03 BTAC BLUE 10 30-mei-03
L-89465 BLB 10 30-mei-03 BTAF BLUE 10 30-mei-03
L-89730 BLB 10 03-mei-03 BTAX BLUE nn 03-mei-03
L-92064 BLB 10 29-mei-03 BUAH BLUE 10 03-mei-03
L-92066 BLB 10 29-mei-03 BUAJ BLUE 10 03-mei-03
L-9281? BLB 10 30-mei-03 BUAL BLUE 10 03-mei-03
L-92821 BLB 10 29-mei-03 BUAL BLUE 10 29-mei-03
L-92873 BLB 10 03-mei-03 BUAL BLUE 10 30-mei-03
L-92876 BLB 10 03-mei-03 BUAM BLUE 10 30-mei-03
L-92878 BLB 10 30-mei-03 BVAM BLUE nn 03-mei-03
L-95841 BLB 10 30-mei-03 BVAN BLUE 10 29-mei-03
L-95851 BLB 10 30-mei-03 BVAP BLUE 10 03-mei-03
L-96064 BLB 10 30-mei-03 BWAD BLUE 10 03-mei-03
ABAJ BLUE 10 03-mei-03 BWAD BLUE 10 29-mei-03
ABAR BLUE 10 03-mei-03 BWAG BLUE nn 29-mei-03
ACAD BLUE 10 03-mei-03 BWAK BLUE 10 03-mei-03
ACAD BLUE 8 29-mei-03 BWAK BLUE 10 29-mei-03
ACAG BLUE 10 30-mei-03 BWAK BLUE 10 30-mei-03
ACAJ BLUE 10 29-mei-03 BWAY BLUE 10 03-mei-03
ACAJ BLUE 10 30-mei-03 xxAH BLUE nn 29-mei-03
ACAL BLUE 10 29-mei-03 GG49806 GBT 10 30-mei-03
ADAF BLUE 10 29-mei-03 AH6 GREEN 10 03-mei-03
ADAF BLUE 10 30-mei-03 AH6 GREEN 9 29-mei-03
ADAW BLUE nn 30-mei-03 E??? GREEN 10 30-mei-03
AFAF BLUE 10 29-mei-03 E475 GREEN 10 03-mei-03
AFAP BLUE 10 03-mei-03 E840 GREEN nn 03-mei-03
AFAS BLUE nn 03-mei-03 EK96 GREEN 10 03-mei-03
AFAS BLUE nn 29-mei-03 EK96 GREEN 10 29-mei-03
AGAB BLUE 10 03-mei-03 EK96 GREEN 10 30-mei-03
AGAB BLUE 10 29-mei-03 EL07 GREEN 10 30-mei-03
AGAH BLUE 10 03-mei-03 EM35 GREEN 10 30-mei-03
AHAL BLUE 10 03-mei-03 NU4 GREEN 10 03-mei-03
AHAP BLUE 10 29-mei-03 NU4 GREEN 10 30-mei-03
AHAS BLUE 10 29-mei-03 NV5 GREEN 10 03-mei-03
AHAW BLUE 10 29-mei-03 NV5 GREEN 10 29-mei-03
AHAZ BLUE 10 30-mei-03 TJ5 GREEN 10 03-mei-03
AJAJ BLUE 10 29-mei-03 5.???.??? NLA 10 30-mei-03
AJAY BLUE 9 30-mei-03 5.330.647 NLA 10 03-mei-03
AMAK BLUE 10 29-mei-03 5.360.136 NLA 10 03-mei-03
AMAK BLUE 10 30-mei-03 E037 ORANGE 10 03-mei-03
ANAN BLUE 10 29-mei-03 E037 ORANGE 10 29-mei-03
ANAS BLUE 10 30-mei-03 E836 ORANGE 10 03-mei-03
ANAW BLUE nn 29-mei-03 E836 ORANGE nn 29-mei-03
APAH BLUE 10 03-mei-03 EK47 ORANGE 10 29-mei-03
AUAA BLUE 10 03-mei-03 ES29 ORANGE 9 30-mei-03
AWAU BLUE 10 03-mei-03 ES51 ORANGE 10 03-mei-03
AXAG BLUE 10 03-mei-03 ES98 ORANGE 10 03-mei-03
AZAK BLUE nn 30-mei-03 ET03 ORANGE 10 03-mei-03
BAAG BLUE 9 30-mei-03 ET85 ORANGE 10 30-mei-03
BBAF BLUE nn 03-mei-03 EX22 ORANGE 10 03-mei-03
BBAF BLUE 10 30-mei-03 EX22 ORANGE nn 29-mei-03
BCAD BLUE nn 29-mei-03 EX22 ORANGE 8 30-mei-03
BCAD BLUE 10 30-mei-03 E131 RED 10 03-mei-03
BDAD BLUE 10 03-mei-03 RV2 WHITE nn 03-mei-03
BDAD BLUE nn 29-mei-03 RV2 WHITE 10 29-mei-03
BHAW BLUE 9 30-mei-03 TC5 WHITE 10 30-mei-03
BJAA BLUE 10 29-mei-03 TP3 WHITE 10 03-mei-03
BKAN BLUE 10 30-mei-03 TP3 WHITE 9 29-mei-03
        TU7 WHITE 10 03-mei-03
Notes:
RPS: Remaining Primary Score: 10 means 10 old primaries, 9 means P1 shed, etc.
nn: not noted.
BLB: metal ring Bruxelles - Belgium.
BLUE: darvic ring blue - Belgium, ringing project Zeebrugge.
GREEN: darvic ring green - the Netherlands, ringing project Maasvlakte.
NLA: metal ring Arnhem - the Netherlands.
ORANGE: darvic ring orange - the Netherlands, ringing project Maasvlakte.
RED: darvic ring red - the Netherlands, ringing project Maasvlakte.
WHITE: darvic ring white - the Netherlands, ringing project Maasvlakte.

May 03 2003:
n: 58, (7x not noted, 51x primary score 10)
m: primary score 10.0 (all primaries present in 100% of birds)
SD: 0.00
May 29 2003:
n: 42, (8x not noted, 31x primary score 10, 2x score 9, 1x score 8)
m: primary score 9.9
SD: 0.41
May 30 2003:
n: 52, (3x not noted, 43 primary score 10, 4x score 9, 2x score 8)
m: primary score 9.8
SD: 0.47

Conclusions:
When primary score was not noted (nn), but recorded 10 at a later date, nn can be replaced for 10.

Primary Moult Scores in ringed (near)adult LBBG at Maasvlakte & Dintelhaven, the Netherlands in May. Date: 07, 17, 27 May & 02 June 2003.
code ring RPS date code ring RPS date
?-?8360 BLB 10 05-07-03 TS0 green 10 05-17-03
?-?9951 BLB 10 06-02-03 TS0 green 10 05-27-03
L-89??? BLB 10 05-07-03 TS1 green 10 05-07-03
L-93303 BLB 10 05-07-03 UA4 green 10 05-07-03
L-93303 BLB 10 05-17-03 UT8 green 10 05-17-03
FA8370? GBT 10 06-02-03 UT8 green 10 05-27-03
GG44883 GBT 10 05-07-03 EJ86 green 10 05-07-03
GG93433 GBT nn 06-02-03 JL7 green 10 05-07-03
GT75716 GBT 10 06-02-03 5.251.194 NLA 10 06-02-03
E129 green 10 05-27-03 5.257.218 NLA 10 06-02-03
E277 green 10 05-17-03 5.257.580 NLA 10 06-02-03
E392 green nn 06-02-03 5.321.306 NLA 10 05-27-03
E496 green 10 05-17-03 5.360.522 NLA 10 05-17-03
E610 green 10 05-07-03 5.360.522 NLA 10 05-27-03
E610 green 10 05-17-03 ?.???.199 NLA 10 05-07-03
E610 green 10 06-02-03 5.308.77? NLA 10 05-07-03
E623 green 10 05-07-03 5.360.??? NLA 10 05-17-03
E641 green 10 05-07-03 NY0 nn 10 05-17-03
E835 green 10 05-27-03 AM0 orange 10 06-02-03
E968 green 10 05-07-03 CT7 orange 10 06-02-03
E994 green 10 05-07-03 CU9 orange 9 05-07-03
EAK5 green 10 05-07-03 CU9 orange 8 05-27-03
EAS1 green 10 05-07-03 CU9 orange 8 06-02-03
EAS1 green 10 05-17-03 E017 orange nn 06-02-03
EAS1 green 9 06-02-03 E053 orange nn 05-07-03
ECC0 green 10 05-17-03 E053 orange 10 06-02-03
ECC3 green nn 06-02-03 E202 orange 10 05-17-03
EE02 green 10 05-07-03 E264 orange 10 05-17-03
EE44 green 10 05-27-03 E400 orange nn 05-07-03
EH89 green 10 05-07-03 E600 orange 8 06-02-03
EJ1 green 10 06-02-03 E702 orange 10 05-17-03
EJ15 green 10 05-07-03 E818 orange 10 05-17-03
EJ97 green 10 05-07-03 E835 orange 10 05-17-03
EJ97 green 10 05-17-03 E835 orange 9 05-27-03
EL4 green 9 06-02-03 EC40 orange 10 05-17-03
EN40 green 10 05-17-03 EC40 orange 10 06-02-03
EN84 green 10 05-17-03 EC57 orange 10 06-02-03
EP79 green 10 05-17-03 ECC1 orange 10 05-07-03
ES98 green 10 05-17-03 EH42 orange 10 05-07-03
ES98 green 10 06-02-03 EH52 orange 10 05-17-03
ET17 green 9 05-17-03 EH79 orange nn 05-07-03
ET79 green 10 05-07-03 EH79 orange 10 06-02-03
EV39 green 10 05-17-03 EK85 orange 10 05-07-03
EV39 green 9 06-02-03 EK85 orange 10 06-02-03
EV60 green 10 05-07-03 EL83 orange 10 05-07-03
EY16 green 10 05-07-03 EL83 orange 10 05-07-03
EY17 green 10 05-17-03 EL83 orange 10 05-27-03
EY23 green 10 05-17-03 EM30 orange 10 06-02-03
JH5 green 10 05-07-03 EM41 orange 10 05-17-03
JH5 green 10 05-17-03 EM86 orange 10 06-02-03
JH5 green 10 06-02-03 EN24 orange 10 05-17-03
JL7 green 10 05-07-03 EN54 orange 10 05-27-03
JL7 green 10 05-17-03 EN84 orange 10 06-02-03
KJ0 green 10 05-07-03 EP23 orange 9 06-02-03
KM79? green 9 06-02-03 EP94 orange 10 06-02-03
KV4 green 10 05-07-03 ES43 orange 10 05-17-03
ML9 green 10 05-07-03 EU77 orange nn 06-02-03
NH0 green 10 05-17-03 EU95 orange 10 06-02-03
NV4 green 10 05-07-03 EV62 orange 10 05-17-03
NV7 green 10 05-07-03 EY77 orange 10 05-07-03
PL9 green 10 05-07-03 KE8 orange 10 05-07-03
PL9 green 10 05-17-03 KJ0 orange 10 06-02-03
PP0 green 9 06-02-03 ML2 orange 10 05-27-03
PP4 green 10 05-07-03 UL0 orange 10 06-02-03
PP4 green 10 05-07-03 NP8 orange (wh) 10 05-07-03
PP4 green 10 06-02-03 NP8 orange (wh) 10 06-02-03
PR4 green 10 05-07-03 PS6 orange (wh) 10 05-27-03
PR4 green 10 05-17-03 E319 red 10 05-17-03
PS0 green 10 06-02-03 E349 red 10 05-27-03
PV2 green 10 05-17-03 3 LINES white 10 05-07-03
RC3 green 10 05-07-03 R18 white 10 05-07-03
RL9 green 10 05-07-03 RR5 white 10 05-17-03
RV0 green 10 05-17-03 SH2 white 10 05-07-03
SH2 green nn 05-17-03 SS3 white 10 05-07-03
TH1 green 10 05-17-03 TN4 white 10 05-07-03
TH5 green 10 05-17-03 7 S white red 10 05-07-03
        7 S white red 10 05-07-03
Notes:
RPS: Remaining Primary Score: 10 means 10 old primaries, 9 means P1 shed, etc.
nn: not noted.
BLB: metal ring Bruxelles - Belgium.
GBT: metal ring BTO - Britain.
GREEN: darvic ring green - the Netherlands, ringing project Maasvlakte.
NLA: metal ring Arnhem - the Netherlands.
ORANGE: darvic ring orange - the Netherlands, ringing project Maasvlakte.
RED: darvic ring red - the Netherlands, ringing project Maasvlakte.
WHITE: darvic ring white - the Netherlands, ringing project Maasvlakte.

May 05 2003:
n: 56, (3x not noted, 52x primary score 10, 3x score 9)
m: primary score 10.0
SD: 0.14
May 17 2003:
n: 43, (1x not noted, 41x primary score 10, 1x score 9)
m: primary score 10.0
SD: 0.15
May 27 2003:
n: 14, (3x not noted, 12 primary score 10, 1x score 9, 1x score 8)
m: primary score 9.8
SD: 0.58
June 02 2003:
n: 35, (5x not noted, 27 primary score 10, 6x score 9, 2x score 8)
m: primary score 9.7
SD: 0.57

Conclusions:
When primary score was not noted (nn), but recorded 10 at a later date, nn can be replaced for 10.

 

 

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Adult intermedius from Norway
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juvenile LBBG in September, ringed in Norway. (73485 bytes)Lesser Black-backed Gull intermedius J0K0 1CY-6CY, August 2008 - May 2013, Norway - Denmark - Spain - Morocco - the Netherlands.
Arrested moult in 3CY after an extraordinary extensive moult at the wintering grounds in Morocco.
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Adult graellsii from the U.K.
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Lesser Black-backed Gull graellsii RXB 5cy & 9cy-11cy, August 2009, May 2013 - April 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BTO GG49760 19cy & 21cy, April-May 2012 & April 2014, Calais, NW France. Picture: Jean-Michel Sauvage.
adult graellsii in May, ringed in the U.K. (77394 bytes)Lesser Black-backed Gull graellsii BTO GG-63075 18CY, May 31 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
A female begging for food at a male and still without a nest.
adult graellsii in May, ringed in the U.K. (82288 bytes)Lesser Black-backed Gull graellsii BTO GG-81065 16CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E). 
adult graellsii in May, ringed in the U.K. (89370 bytes)Lesser Black-backed Gull graellsii BTO G?-09708 adult, May 03 2004, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
A female with a nest.
Lesser Black-backed Gull graellsii BTO FP-778xx adult, May 02 2017, Hoornderslag - Texel, the Netherlands.
Lesser Black-backed Gull graellsii BTO FV-38253 8CY-12CY, June 2013, April 2014 & May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
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Adult graellsii from France.
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Lesser Black-backed Gull graellsii 029A 5cy, April - July 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii EA 639805 / 104N 8cy, May 02 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii EA 639806 / 105N 10CY & 13CY, April 2014 & May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA670038 / 154N 7cy-8cy & 13cy, April 2011, April 2012 & May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA639885 / 165N 7CY-11CY, 2011-2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 255K 6cy, May-June 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 399N 8cy, April, May & June 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA670077 / 404N 7cy, May 04 2012, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA672138 / 409N 7cy, May 04 2012, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii EA 672341 / 440N 7CY & 9CY, April - May 2013 & May 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 452N 5cy, May 19 2011, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA672243 / 530N 7CY-11Y, April 2013 & 2014 & May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA672380 / 593N 11CY, May - July 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 689N 6CY, May 11 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 702N 10CY, May 06 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA672544 / 738N 5cy-10cy, April 2012 - May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 804N 8CY-10CY, April 2015 & May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 918N 5CY-8CY, March 2013 - April 2016, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA558211 adult, May 14 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA558245 adult, May 14 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA677791 adult, April, May & June 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA672456 / 937K adult, May - July 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii FRP EA677789 adult, May 06 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
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Adult graellsii "Dutch intergrade" from Belgium.
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sub-adult graellsii in May, ringed in Belgium. (79079 bytes)Lesser Black-backed Gull graellsii ACAJ 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
sub-adult graellsii in May, ringed in Belgium. (79105 bytes)Lesser Black-backed Gull graellsii ACAL 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
sub-adult graellsii in May, ringed in Belgium. (71477 bytes)Lesser Black-backed Gull graellsii ADAF 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
sub-adult graellsii in May, ringed in Belgium. (74850 bytes)Lesser Black-backed Gull graellsii AFAF 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
sub-adult graellsii in May, ringed in Belgium. (92730 bytes)Lesser Black-backed Gull graellsii AFAS 5cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
sub-adult graellsii in May, ringed in Belgium. (92730 bytes)Lesser Black-backed Gull graellsii AGAB 8cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 4cy.
sub-adult graellsii in May, ringed in Belgium. (77469 bytes)Lesser Black-backed Gull graellsii AHAS 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
sub-adult graellsii in May, ringed in Belgium. (92730 bytes)Lesser Black-backed Gull graellsii AHAW & E840 7cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
sub-adult graellsii in May, ringed in Belgium. (77011 bytes)Lesser Black-backed Gull graellsii AMAK 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
sub-adult graellsii in May, ringed in Belgium. (92730 bytes)Lesser Black-backed Gull graellsii BDAD 6cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
sub-adult graellsii in May, ringed in Belgium. (77541 bytes)Lesser Black-backed Gull graellsii BJAA 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
sub-adult graellsii in May, ringed in Belgium. (69228 bytes)Lesser Black-backed Gull graellsii BLAD 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
sub-adult graellsii in May, ringed in Belgium. (76507 bytes)Lesser Black-backed Gull graellsii BMAA 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
sub-adult graellsii in May, ringed in Belgium. (84300 bytes)Lesser Black-backed Gull graellsii BMAZ 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
adult graellsii in May, ringed in Belgium. (92730 bytes)Lesser Black-backed Gull graellsii BWAD 7+cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as adult.
Lesser Black-backed Gull graellsii DL.AS 11CY, May 05 2016, Neeltje Jans, the Netherlands (51°38'17.74"N 3°42'27.05"E).
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii D.UAK 2CY & 10CY, September 2007 & April - May 2015, the Netherlands. Picture: Merijn Loeve & Pim Wolf.
Lesser Black-backed Gull graellsii GHAC adult, May 30 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii HAAB 11CY, May - June 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii HKAB 5cy-6cy, 2012-2013, Calais, NW France. Picture: Jean-Michel Sauvage.
sub-adult graellsii in May, ringed in Belgium. (77011 bytes) Lesser Black-backed Gull graellsii HRAS 4CY & 8CY, May 2011 & May 2015, Belgium & the Netherlands. Picture: Peter Adriaens & Merijn Loeve.
Lesser Black-backed Gull graellsii KJAM 7CY-11CY, 2013-2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii KJAP 7cy, May 04 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
ad LBBG in Januari-April, ringed in the Netherlands. (76807 bytes)Lesser Black-backed Gull graellsii L.KAR 6CY, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii LRAU 5cy, April & May 2013, Calais, NW France. Picture: Jean-Michel Sauvage.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii MYAL 8CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii NHAH 4CY-6CY, July 2013, April 2014, May 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
adult graellsii in May, ringed in Belgium. (67406 bytes)Lesser Black-backed Gull graellsii BLB L-62174 7cy, May 03 & 30 2003, Voorhaven, Zeebrugge, Belgium (51.59N 04.02E).
sub-adult graellsii in May, ringed in Belgium. (79156 bytes)Lesser Black-backed Gull graellsii BLB L-89427 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). No mirror on P10.
Lesser Black-backed Gull graellsii BLB L-904293 adult, May 04 2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-906775 6CY-11CY, April 2012 - May 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-913126 6CY-8CY, May 2015 & 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-106388 10CY-13CY, 2012-2015, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-906131 8CY-9CY, April - May 2013 & April 2014, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-906179 6CY-12CY, 2010-2016, Calais, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-906607 9CY, May 01 2014, Boulogne sur Mer, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii BLB L-913126 6CY-8CY, May 2015 & 2017, Calais, NW France. Picture: Jean-Michel Sauvage.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii BLB L-915715 6CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
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Adult graellsii "Dutch intergrade" from the Netherlands.
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adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii 5.G 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii C1 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii C3 adult, May-June 2015 & May 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E). Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii C6 adult, May 21 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii C8 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii CZ adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii HF adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii H.V 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii J.E 4CY-5CY, June 2015 & May 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E). Picture: Merijn Loeve & Mars Muusse.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii K9 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KB adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KG adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KH adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KJ adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KL adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KM adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii KN adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii K= adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii MB adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii MD adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii NB adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NC adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii ND adult, May 2015 & May 2016, Katwijk-Noordwijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii NE adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NF adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NG adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NK adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NL adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NM adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NN adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NP adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NR adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NT adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NU adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NV sub-adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NW adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii NX sub-adult, May 29 2015, Katwijk, the Netherlands. Picture: Merijn Loeve & ringing team Roland-Jan Buijs.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii R8 6CY, May 04 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii R.B 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii Z.8 5CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 52 5CY, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii NY 6CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii N+ adult, May 01 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii P* adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii R= adult, March & May 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii U7 5CY, May & July 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii U= was EL03 21CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii Z= was PM4 20CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
possible Lesser Black-backed Gull graellsii x Herring Gull argenteus KB adult, May 28 2013, Katwijk, the Netherlands. Picture: Jeroen Nagtegaal & ringing team Roland-Jan Buijs.
Lesser Black-backed Gull graellsii P.V 5CY, May 14 2017, Katwijk, the Netherlands.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii TD adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 0.0 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 2.B 6CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 9.9 was C88 14CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 4+ 15CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 58 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 5* adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 6F adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 8W adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 8X adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 9X adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii M9 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii M+ 20CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii NB adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii NE adult, August 2014 & May-June 2016, Boulogne sur mer, NW France & Maasvlakte, the Netherlands. Picture: Jean-Michel Sauvage & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii M9 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii Y6 adult, May 11 2016, Maasvlakte (Coloradoweg), the Netherlands (51.57.00 N 04.01.00 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii Z2 adult, May 11 2016, Maasvlakte (Coloradoweg), the Netherlands (51.57 N 04.01 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii ZF adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii ZR adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii ZV adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii H5 adult, May 2006, October 2011 & August 2016, the Netherlands. Picture: Theo Muusse, Maarten van Kleinwee & Henri Zomer.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii JV4T adult, May 02-23 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii PB6T adult, March 28 & May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii PJ7T adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii RL1T adult, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii T061 adult, May 01 2014 & April 07 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii 27 adult, May 2006 & April 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii 69 adult, May 2006 & April 2015, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii C6 adult, May 2006 & April 2015, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii JH adult, May 2005 & March 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii K6 adult, May 2005 & May 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii KP adult, May 2005, May 2006 & September 2012, Moerdijk & Dordrecht, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii OV 6cy-9cy, 2010-2014, Calais, NW France. Picture: Jean-Michel Sauvage.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii SF adult, May 01 & August 10 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii T6 adult, May 2005, April 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii 1S 4CY & 12CY, May 2006 & May 2014, Moerdijk-Sassenplaat, the Netherlands. Picture: Merijn Loeve & Roland-Jan Buijs.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii BA 4CY & 12CY, May 2006 & March 2014, Moerdijk-Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii D0 5cy, May 05 2011, IJmuiden, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii DJ 8CY-9CY, May 2014 & July 2015, Maasvlakte & Utrecht, the Netherlands. Picture: Merijn Loeve & Herman Bouman.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii F4 8CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii JH (was SX7) 9CY & 17CY, May 2006 & February 2014, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii NL (was EAU7) 10CY & 18CY, May 2006 & March 2014, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii S3 adult, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 79 adult, 2005, 2013 & 2014, Dordrecht & Moerdijk, the Netherlands. Picture: Merijn Loeve & Muusse brothers.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii HV adult, May 2005 & May 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii NN adult, May 2006 & July 2015, Moerdijk & Tilburg, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii B.3 adult, March - April 2015, May 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E). Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii B7 adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii B.8 adult, June 08 2015 & May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E). Picture: Merijn Loeve & Mars Muusse.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii B.F adult, March 30 2015 & May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E). Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii BH adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii B.M adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii B.X adult, April - June 2015 & May 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E). Picture: Merijn Loeve & Mars Muusse.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii BZ adult, March 30 & May 21 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii C.E adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii D7 adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii DX adult, May 02 2014, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii DZ adult, May 02 2014, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii EA (formerly EY98) 18CY, May 23 & June 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii EB (formerly EA57) 19CY, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii E.D (was EJ34) 21CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii E.T adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii GL adult, May 30 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii 18 7CY, May 01 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii Y.AAS adult, May 06 2011, IJmuiden, the Netherlands.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii Y.ABU adult, May 29 2017, Heemskerk, the Netherlands.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii Y.ANL 5CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii M.AXW adult, May 02 2017, Den Hoorn - Texel, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii 2A6B adult, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii E040 11CY, May 30 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii E469 11CY, May 20 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
probable adult hybrid michahellis x argenteus in May, ringed in the Netherlands. (74607 bytes)Lesser Black-backed Gull graellsii AH6 12cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.21N,03.11E).
Ringed June 20 1992, now paired
BWAD .
adult graellsii in May, ringed in the Netherlands. (58305 bytes)Lesser Black-backed Gull graellsii JL7 10CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 21 1993.
adult graellsii in May, ringed in the Netherlands. (56435 bytes)Lesser Black-backed Gull graellsii LC9 10CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 28 1993.
adult graellsii in May, ringed in the Netherlands. (76575 bytes)Lesser Black-backed Gull graellsii LU3 10CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 28 1993. An example of a bird which moved to another colony (5 km's).
ad LBBG in Januari-April, ringed in the Netherlands. (80911 bytes)Lesser Black-backed Gull graellsii PJ2 15CY, 18CY, 19CY, September 2011, May 2014 & April 2015, the Netherlands. Picture: Merijn Loeve & Maarten van Kleinwee.
adult graellsii in May, ringed in the Netherlands. (52536 bytes)Lesser Black-backed Gull graellsii SE4 6CY, May 13 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 03 1997.
Note the recently moulted feathers in the inner greater, inner median and central median coverts. 
adult graellsii in May, ringed in the Netherlands. (52536 bytes)Lesser Black-backed Gull graellsii SY6 / NJ 17CY & 19CY, May-July 2013 and May 2015, Katwijk, the Netherlands.
ad LBBG in Januari-April, ringed in the Netherlands. (84892 bytes)Lesser Black-backed Gull graellsii TL8 8CY & 18CY, February 2006 & May 2016, Madrid, Spain & Neeltje Jans, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (65392 bytes)Lesser Black-backed Gull graellsii TS0 adult, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
adult graellsii in May, ringed in the Netherlands. (69808 bytes)Lesser Black-backed Gull graellsii UT8 11CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 21 1993.
adult graellsii in May, ringed in the Netherlands. (86466 bytes)Lesser Black-backed Gull graellsii E129 8CY-9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 26 1995.
adult graellsii in May, ringed in the Netherlands. (59133 bytes)Lesser Black-backed Gull graellsii E835 9CY, May 27 2003, EMO - Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 05 1995.
adult graellsii in May, ringed in the Netherlands. (76950 bytes)Lesser Black-backed Gull graellsii EE44 10CY, May 27 2003, EMO - Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 07 1994.
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii EU06 6CY, May 12 2001, Missouriweg Maasvlakte, the Netherlands.
Ringed June 28 1996.
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii xx (formerly EX27) 19CY, May 31 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (77885 bytes)Lesser Black-backed Gull graellsii EY17 6CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 24 1997.
adult graellsii in May, ringed in the Netherlands. (84671 bytes)Lesser Black-backed Gull graellsii EY84 6CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 24 1997. Probably a male. As with EY17 green, those birds return to the almost exact spot of ringing.
ad LBBG in Januari-April, ringed in the Netherlands. (76807 bytes)Lesser Black-backed Gull graellsii EAU6 17CY, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii X27 adult, May 02 2014, Maasvlakte-Dintelhaven, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii AH1 11CY, May 12 2001 & May 23 2002, Missouriweg Maasvlakte, the Netherlands.
Ringed June 23 1992.
adult michahellis in May, ringed in the Netherlands. (72689 bytes)Yellow-legged Gull michahellis CU9 13+cy & Lesser Black-backed Gull graellsii adult, Missouriweg - Maasvlakte, the Netherlands, May 12 2002 (51.59N,04.02E).
One of the few mixed pairs at Maasvlakte.
adult graellsii in May, ringed in the Netherlands. (66987 bytes)Lesser Black-backed Gull graellsii KT1 10CY, May 23 2002, Maasvlakte, the Netherlands. Ringed July 07 1993.
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii KY8 10CY, May 18-30 2000, Maasvlakte, the Netherlands.
Ringed in 1991.
adult graellsii in May, ringed in the Netherlands. (68613 bytes) Lesser Black-backed Gull graellsii ML2 10CY-11CY, May 23 2002 & May 27 2003, EMO - Maasvlakte, the Netherlands.
Ringed July 08 1993.
adult graellsii in May, ringed in the Netherlands. (105237 bytes)Lesser Black-backed Gull graellsii SP0 adult, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). 
adult graellsii in May, ringed in the Netherlands. (96404 bytes)Lesser Black-backed Gull graellsii E001 11+CY, May 23 2002, Maasvlakte (EMO) the Netherlands.
Ringed as adult on the nest June 1995.
adult michahellis in May, ringed in the Netherlands. Yellow-legged Gull michahellis E051 9+CY & Lesser Black-backed Gull graellsii, May 30 2000, Maasvlakte (Naaktstrand) the Netherlands.
Ringed as adult on the nest July 1995.
adult graellsii in May, ringed in the Netherlands. (50387 bytes)Lesser Black-backed Gull graellsii E052 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 01 1995.
adult graellsii in May, ringed in the Netherlands. (76496 bytes)Lesser Black-backed Gull graellsii E053 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 01 1995. From the same nest as E052.
adult graellsii in May, ringed in the Netherlands. (69265 bytes)Lesser Black-backed Gull graellsii E400 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed on July 08 1995 near the current breeding spot.
adult graellsii in May, ringed in the Netherlands. (77207 bytes)Lesser Black-backed Gull graellsii E563 8CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 08 1995.
adult graellsii in May, ringed in the Netherlands. (79202 bytes)Lesser Black-backed Gull graellsii E618 10CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 09 1995.
adult graellsii in May, ringed in the Netherlands. (70687 bytes)Lesser Black-backed Gull graellsii E835 9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 09 1995.
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii E914 7CY,May 12 2001, Missouriweg Maasvlakte, the Netherlands.
Ringed July 10 1995.
adult graellsii in May, ringed in the Netherlands. (63968 bytes)Lesser Black-backed Gull graellsii E955 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 10 1995.
adult graellsii in May, ringed in the Netherlands. (61386 bytes)Lesser Black-backed Gull graellsii EA10 7CY, May 23 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed as pullus July 08 1996.
adult graellsii in May, ringed in the Netherlands. (72707 bytes)Lesser Black-backed Gull graellsii EC07 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
adult graellsii in May, ringed in the Netherlands. (75111 bytes)Lesser Black-backed Gull graellsii EC40 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
adult graellsii in May, ringed in the Netherlands. (61201 bytes)Lesser Black-backed Gull graellsii EH79 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 10 1995.
adult graellsii in May, ringed in the Netherlands. (77993 bytes)Lesser Black-backed Gull graellsii EJ17 7CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed at ECT, July 08 1996 near the current breeding spot.
adult graellsii in May, ringed in the Netherlands. (63030 bytes)Lesser Black-backed Gull graellsii EK85 7CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 09 1996.
adult graellsii in May, ringed in the Netherlands. (81471 bytes)Lesser Black-backed Gull graellsii EK89 9CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E).
A bird ringed July 09 1996.
adult graellsii in May, ringed in the Netherlands. (88168 bytes)Lesser Black-backed Gull graellsii EL22 7CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 09 1996.
adult graellsii in May, ringed in the Netherlands. (75887 bytes)Lesser Black-backed Gull graellsii EL83 7CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 09 1996.
adult LBBG Dutch intergrade in September, ringed in the Netherlands. (85708 bytes)Lesser Black-backed Gull graellsii EM41 19CY-20CY, May 23 2014 & March 30 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (75587 bytes)Lesser Black-backed Gull graellsii EM86 7CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 10 1996.
adult graellsii in May, ringed in the Netherlands. (66195 bytes)Lesser Black-backed Gull graellsii EN11 7CY, May 31 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 10 1996.
adult graellsii in May, ringed in the Netherlands. (77938 bytes)Lesser Black-backed Gull graellsii EP00 7CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed at ECT, July 13 1996 near the current breeding spot.
adult graellsii in May, ringed in the Netherlands. (89390 bytes)Lesser Black-backed Gull graellsii ET37 7CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed at ECT, July 13 1996 near the current breeding spot.
adult graellsii in May, ringed in the Netherlands. (88284 bytes)Lesser Black-backed Gull graellsii ET48 9CY, May 24 2004, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 08 1996.
adult graellsii in May, ringed in the Netherlands. (45139 bytes)Lesser Black-backed Gull graellsii EU95 6CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 02 1997.
adult graellsii in May, ringed in the Netherlands. (56271 bytes)Lesser Black-backed Gull graellsii EX13 6CY, May 23 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 03 1997.
adult graellsii in May, ringed in the Netherlands. (72400 bytes)Lesser Black-backed Gull graellsii EAR0 6CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed July 04 1997, on the ECT emplacement, but now breeding in the Dintelhaven colony. It's often the females which disperse over other colonies, with about 75% of the males returning to the original colony (as Herring Gull research indicated).
adult graellsii in May, ringed in the Netherlands. Lesser Black-backed Gull graellsii EAY0 7CY, female, May 12 2001, Dintelhaven Maasvlakte, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (97116 bytes)Lesser Black-backed Gull graellsii ECL4 8CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E).
A bird ringed July 03 1997.
adult graellsii in May, ringed in the Netherlands. (71032 bytes)Lesser Black-backed Gull graellsii NT0 6CY, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
Ringed July 11 1997. Note the rather parallel bill. The primary tips are relatively small, though fresh.
adult graellsii in May, ringed in the Netherlands. (67765 bytes)Lesser Black-backed Gull graellsii PN5 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
Male, probably ringed July 11 1997.
adult graellsii in May, ringed in the Netherlands. (69493 bytes)Lesser Black-backed Gull graellsii R60 12CY, May 13 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed at the Maasvlakte as pullus male, July 06 1991 near the current breeding spot.
adult graellsii in May, ringed in the Netherlands. (79250 bytes)Lesser Black-backed Gull graellsii V90 12CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A female ringed July 08 1991. Nest contains three eggs.
adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii SV0 17CY, May 02-23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii SX4 17CY, May 02-23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii J7 adult, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
adult graellsii in May, ringed in the Netherlands. (65753 bytes)Lesser Black-backed Gull graellsii 1 7 adult, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
adult graellsii in May, ringed in the Netherlands. (87040 bytes)Lesser Black-backed Gull graellsii E019 6CY & 11CY, May 2004 & Augsut 2009, Maasvlakte & Westkapelle, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (88722 bytes)Lesser Black-backed Gull graellsii E022 6CY, May 24 2004, Missouriweg Maasvlakte, the Netherlands (51.59N 04.02E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii E136 6CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E).
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii EE328 15CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsii E800 6CY, May 2009, Moerdijk, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (68807 bytes)Lesser Black-backed Gull graellsii NLA 5.28x.764 13CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Probably ringed 1992.
adult graellsii in May, ringed in the Netherlands. (71631 bytes)Lesser Black-backed Gull graellsii NLA 5.248.912 15CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
An old Dutch aluminum ring, ringed 1988. Male.
adult graellsii in May, ringed in the Netherlands. (73064 bytes)Lesser Black-backed Gull graellsii NLA 5.257.580 14cy, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Female. Ringed July 09 1989, ECT-Maasvlakte as pullus.
adult graellsii in May, ringed in the Netherlands. (69556 bytes)Lesser Black-backed Gull graellsii NLA 5.257.218 14CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Female. Again ringed July 09 1989, ECT-Maasvlakte as pullus.
adult graellsii in May, ringed in the Netherlands. (75234 bytes)Lesser Black-backed Gull graellsii NLA 5.181.236 19CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Ringed June 27 1984, distance of 5 km from the current location. Female.
adult graellsii in May, ringed in the Netherlands. (69426 bytes)Lesser Black-backed Gull graellsii NLA 5.222.908 13cy, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Male, ringed July 19 1990.
adult graellsii in May, ringed in the Netherlands. (59612 bytes)Lesser Black-backed Gull graellsii NLA 5.321.306 9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
adult graellsii in May, ringed in the Netherlands. (74283 bytes)Lesser Black-backed Gull graellsii NLA 5.330.587 6CY, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Female. Ringed June 24 1997, IJmuiden as pullus.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii NLA 5.332.974 adult, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E).
Female.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii NLA 5.404.820 5CY, May 05 2011, IJmuiden, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsii NLA 5.416.820 5CY, May 05 2011, IJmuiden, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (83502 bytes)Lesser Black-backed Gull graellsiiNLA 5.417.298 adult, May & June 2015 & March 2016, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsiiNLA 5.464.846 6CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
Lesser Black-backed Gull graellsii NLA 5.467.787 7CY, May 10 2017, Katwijk, the Netherlands.
adult graellsii in May, ringed in the Netherlands. (72722 bytes)Lesser Black-backed Gull graellsiiNLA 5.472.386 5CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsiiNLA 5.504.144 adult, May 02 2017, Texel, the Netherlands.
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Adult graellsii ringed in winter in Spain.
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adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii N09V adult, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Ringed in Spain, breeding in the Netherlands.
adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii N0LH adult, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Ringed in Spain, breeding in the Netherlands.
adult graellsii in May, ringed in the Netherlands. (74841 bytes)Lesser Black-backed Gull graellsii N0LL adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Ringed in Spain, breeding in the Netherlands.
adult graellsii in May, ringed in Spain. (80973 bytes)Lesser Black-backed Gull graellsii ESI 6003175 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N 04.02E).
A Spanish aluminum ring: Minist. Agricultura Icona Madrid.
Ringed in Spain, breeding in the Netherlands.