Lesser Black-backed Gull (graellsii & intermedius)
(last update:
lbbg 1cy May
lbbg 1cy June
lbbg 1cy July
lbbg 1cy August
lbbg 1cy September
lbbg 1cy October
lbbg 1cy November
lbbg 1cy December
lbbg 2cy January
lbbg 2cy February
lbbg 2cy March
lbbg 2cy April
lbbg 2cy May
lbbg 2cy June
lbbg 2cy July
lbbg 2cy August
lbbg 2cy September
lbbg 2cy October
lbbg 2cy November
lbbg 2cy December
lbbg 3cy January
lbbg 3cy February
lbbg 3cy March
lbbg 3cy April
lbbg 3cy May
lbbg 3cy June
lbbg 3cy July
lbbg 3cy August
lbbg 3cy September
lbbg 3cy October
lbbg 3cy November
lbbg 3cy December
lbbg sub-ad January
lbbg sub-ad February
lbbg sub-ad March
lbbg sub-ad April
lbbg sub-ad May
lbbg sub-ad June
lbbg sub-ad July
lbbg sub-ad August
lbbg sub-ad Sept
lbbg sub-ad Oct
lbbg sub-ad Nov
lbbg sub-ad Dec
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 |
|
|
|
|
|
| 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
|
|
|
|
|
|
|
|
|
|
|
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).
|
Netherlands
|
|
||||
|
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: |
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| 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: |
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Adult intermedius from Norway
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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.
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.
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.
Lesser Black-backed Gull graellsii BTO
GG-81065 16CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E). 
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.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.Adult graellsii "Dutch intergrade" from Belgium.
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Lesser Black-backed Gull graellsii ACAJ 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
Lesser Black-backed Gull graellsii ACAL 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
Lesser Black-backed Gull graellsii ADAF 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
Lesser Black-backed Gull graellsii AFAF 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
Lesser Black-backed Gull graellsii AFAS 5cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
Lesser Black-backed Gull graellsii AGAB 8cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 4cy.
Lesser Black-backed Gull graellsii AHAS 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
Lesser Black-backed Gull graellsii AHAW & E840 7cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
Lesser Black-backed Gull graellsii AMAK 5cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as pullus.
Lesser Black-backed Gull graellsii BDAD 6cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
Lesser Black-backed Gull graellsii BJAA 6cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 2cy.
Lesser Black-backed Gull graellsii BLAD 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
Lesser Black-backed Gull graellsii BMAA 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
Lesser Black-backed Gull graellsii BMAZ 7cy, May 29 2003, Voorhaven, Zeebrugge, Belgium (51.59N,04.02E). Ringed at Zeebrugge as 3cy.
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).
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.
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.
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.
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.
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.
Lesser Black-backed Gull graellsii UV.AM 4CY & 7CY, July 2015 & May 2018, Rotterdam, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii BLB L-62174 7cy, May 03 & 30 2003, Voorhaven, Zeebrugge, Belgium (51.59N 04.02E).
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.
Lesser Black-backed Gull graellsii BLB L-915715 6CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).Adult graellsii "Dutch intergrade" from the Netherlands.
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Lesser Black-backed Gull graellsii 9||= adult, April - May 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii E||B adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii H||6 adult, April - May 2018, Maasvlakte (Amazonehaven), the Netherlands.
Lesser Black-backed Gull graellsii H||9 adult, June
2016 & May 2018, Maasvlakte, the Netherlands.
Lesser Black-backed Gull graellsii G||X adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 1.E 7CY, May 10 2018, Maasvlakte, the Netherlands.
Lesser Black-backed Gull graellsii 5.G 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii C1 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
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.
Lesser Black-backed Gull graellsii C6 adult, May 21 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii C8 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii CZ adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii C+ adult, July 2015 & May 2018, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii HF adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii H.V 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
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.
Lesser Black-backed Gull graellsii K9 adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KA adult, May 10 2018, Maasvlakte - Europoort, the Netherlands. 
Lesser Black-backed Gull graellsii KB adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KG adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KH adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KJ adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KL adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KM adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii KN adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii K= adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii MB adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
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.
Lesser Black-backed Gull graellsii R8 6CY, May 04 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii R.B 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii Z.8 5CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii 4+ was E617 24CY, April - May 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 52 5CY, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii NY 6CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii N+ adult, May 01 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii P* adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii R= adult, March & May 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii U7 5CY, May & July 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii U= was EL03 21CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
Lesser Black-backed Gull graellsii W8 adult, May 10 2018, Maasvlakte, the Netherlands.
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.
Lesser Black-backed Gull graellsii TD adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
Lesser Black-backed Gull graellsii 0.0 5CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
Lesser Black-backed Gull graellsii 2.B 6CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57.00 N 04.06.00 E).
Lesser Black-backed Gull graellsii 3.2 8CY, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 9.9 was C88 14CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).Lesser Black-backed Gull graellsii 4+ 15CY, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii 56 adult, June
2016 & May 2018, Maasvlakte, the Netherlands.
Lesser Black-backed Gull graellsii 58 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii 5* adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii 6F adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii 78 adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 8B adult, April - May 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 8G adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii 8W adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii 8X adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii 9X adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii M9 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
Lesser Black-backed Gull graellsii M+ 20CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
Lesser Black-backed Gull graellsii NB adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
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.Lesser Black-backed Gull graellsii M9 adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56.00 N 04.03.00 E).
Lesser Black-backed Gull graellsii Y6 adult, May 11 2016, Maasvlakte (Coloradoweg), the Netherlands (51.57.00 N 04.01.00 E).
Lesser Black-backed Gull graellsii YG adult, April - May 2018, Maasvlakte (Amazonehaven), the Netherlands.
Lesser Black-backed Gull graellsii Z2 adult, May 11 2016, Maasvlakte (Coloradoweg), the Netherlands (51.57 N 04.01 E).
Lesser Black-backed Gull graellsii ZF adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii ZR adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii ZV adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii H5 adult, May 2006, October 2011 & August 2016, the Netherlands. Picture: Theo Muusse, Maarten van Kleinwee & Henri Zomer. , geringd in winter london in 2011 01.jpg)
Lesser Black-backed Gull graellsii JV4T adult, May 02-23 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve. , geringd in winter london in 2011 02.jpg)
Lesser Black-backed Gull graellsii PB6T adult, March 28 & May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve. , geringd in winter london in 2011 01.jpg)
Lesser Black-backed Gull graellsii PJ7T adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii RL1T adult, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii T061 adult, May 01 2014 & April 07 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii 27 adult, May 2006 & April 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii 69 adult, May 2006 & April 2015, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii C6 adult, May 2006 & April 2015, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii JH adult, May 2005 & March 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii K6 adult, May 2005 & May 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
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.
Lesser Black-backed Gull graellsii SF adult, May 01 & August 10 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii T6 adult, May 2005, April 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii 1S 4CY & 12CY, May 2006 & May 2014, Moerdijk-Sassenplaat, the Netherlands. Picture: Merijn Loeve & Roland-Jan Buijs.
Lesser Black-backed Gull graellsii BA 4CY & 12CY, May 2006 & March 2014, Moerdijk-Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii D0 5cy, May 05 2011, IJmuiden, the Netherlands.
Lesser Black-backed Gull graellsii DJ 8CY-9CY, May 2014 & July 2015, Maasvlakte & Utrecht, the Netherlands. Picture: Merijn Loeve & Herman Bouman.
Lesser Black-backed Gull graellsii F4 8CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii JH (was SX7) 9CY & 17CY, May 2006 & February 2014, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii NL (was EAU7) 10CY & 18CY, May 2006 & March 2014, Moerdijk, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii S3 adult, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii 79 adult, 2005, 2013 & 2014, Dordrecht & Moerdijk, the Netherlands. Picture: Merijn Loeve & Muusse brothers.
Lesser Black-backed Gull graellsii HV adult, May 2005 & May 2014, Moerdijk & Sassenplaat, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii NN adult, May 2006 & July 2015, Moerdijk & Tilburg, the Netherlands. Picture: Merijn Loeve & Mars Muusse.
Lesser Black-backed Gull graellsii 03 adult, May 10 2018, Maasvlakte, the Netherlands.
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.
Lesser Black-backed Gull graellsii B7 adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
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.
Lesser Black-backed Gull graellsii B.E adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
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.
Lesser Black-backed Gull graellsii BH adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii B.M adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
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.
Lesser Black-backed Gull graellsii BZ adult, March 30 & May 21 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii C.E adult, May 11 2016, Europoort (Dintelhaven), the Netherlands (51.57 N 04.06 E).
Lesser Black-backed Gull graellsii D7 adult, May 01 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii DX adult, May 02 2014, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii DZ adult, May 02 2014, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve. mei 2014 Vuurtorenvlakte, Maasvlakte 05.jpg)
Lesser Black-backed Gull graellsii EA (formerly EY98) 18CY, May 23 & June 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve. mei 2014 Vuurtorenvlakte, Maasvlakte 04.jpg)
Lesser Black-backed Gull graellsii EB (formerly EA57) 19CY, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii E.D (was EJ34) 21CY, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii E.T adult, May 11 2016, Maasvlakte (Amazonehaven), the Netherlands (51.56 N 04.03 E).
Lesser Black-backed Gull graellsii E.+ adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
Lesser Black-backed Gull graellsii GL adult, May 30 2015, Maasvlakte - Europoort, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii 18 7CY, May 01 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii Y.AAS adult, May 06 2011, IJmuiden, the Netherlands.
Lesser Black-backed Gull graellsii Y.ABU adult, May 29 2017, Heemskerk, the Netherlands. mei 2014 - geringd in 2010 te IJmuiden 01.jpg)
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.
Lesser Black-backed Gull graellsii 2A6B adult, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii E040 11CY, May 30 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii E469 11CY, May 20 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii AH6 12cy, May 03 2003, Voorhaven, Zeebrugge, Belgium (51.21N,03.11E). Ringed June 20 1992, now paired BWAD .
Lesser Black-backed Gull graellsii JL7 10CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 21 1993.
Lesser Black-backed Gull graellsii LC9 10CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 28 1993.
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).
Lesser Black-backed Gull graellsii PJ2 15CY, 18CY, 19CY, September 2011, May 2014 & April 2015, the Netherlands. Picture: Merijn Loeve & Maarten van Kleinwee.
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.
Lesser Black-backed Gull graellsii SY6 / NJ 17CY & 19CY, May-July 2013 and May 2015, Katwijk, the Netherlands.
Lesser Black-backed Gull graellsii TL8 8CY & 18CY, February 2006 & May 2016, Madrid, Spain & Neeltje Jans, the Netherlands. 
Lesser Black-backed Gull graellsii TS0 adult, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
Lesser Black-backed Gull graellsii UT8 11CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 21 1993.
Lesser Black-backed Gull graellsii E129 8CY-9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 26 1995.
Lesser Black-backed Gull graellsii E835 9CY, May 27 2003, EMO - Maasvlakte, the Netherlands (51.59N,04.02E). Ringed July 05 1995.
Lesser Black-backed Gull graellsii EE44 10CY, May 27 2003, EMO - Maasvlakte, the Netherlands (51.59N,04.02E).Ringed July 07 1994.
Lesser Black-backed Gull graellsii EU06 6CY, May 12 2001, Missouriweg
Maasvlakte, the Netherlands.
Ringed June 28 1996.
Lesser Black-backed Gull graellsii xx (formerly EX27) 19CY, May 31 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii EY17 6CY, May 13 2002, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 24 1997.
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.
Lesser Black-backed Gull graellsii EAU6 17CY, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii X27 adult, May 02 2014, Maasvlakte-Dintelhaven, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii AH1 11CY, May 12
2001 & May 23 2002, Missouriweg Maasvlakte, the Netherlands. Ringed June 23 1992.
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.
Lesser Black-backed Gull graellsii KT1 10CY,
May 23 2002, Maasvlakte, the Netherlands. Ringed July 07 1993.
Lesser Black-backed Gull graellsii KY8 10CY,
May 18-30 2000, Maasvlakte, the Netherlands. Ringed in 1991.
Lesser Black-backed Gull graellsii ML2 10CY-11CY,
May 23 2002 & May 27 2003, EMO - Maasvlakte, the Netherlands. Ringed July 08 1993.
Lesser Black-backed Gull graellsii SP0 adult, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). 
Lesser Black-backed Gull graellsii E001 11+CY, May
23 2002, Maasvlakte (EMO) the Netherlands. Ringed as adult on the nest June 1995.
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.
Lesser Black-backed Gull graellsii E052 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed June 01 1995.
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.
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.
Lesser Black-backed Gull graellsii E563 8CY, May 13 2002, Hartelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed July 08 1995.
Lesser Black-backed Gull graellsii E618 10CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E). Ringed July 09 1995.
Lesser Black-backed Gull graellsii E835 9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed July 09 1995.
Lesser Black-backed Gull graellsii E914 7CY,May 12 2001, Missouriweg
Maasvlakte, the Netherlands.
Ringed July 10 1995.
Lesser Black-backed Gull graellsii E955 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 10 1995.
Lesser Black-backed Gull graellsii EA10 7CY, May 23 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed as pullus July 08 1996.
Lesser Black-backed Gull graellsii EC07 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Lesser Black-backed Gull graellsii EC40 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
Lesser Black-backed Gull graellsii EH79 8CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 10 1995.
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.
Lesser Black-backed Gull graellsii EK85 7CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 09 1996.
Lesser Black-backed Gull graellsii EK89 9CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E). A bird ringed July 09 1996.
Lesser Black-backed Gull graellsii EL22 7CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 09 1996.
Lesser Black-backed Gull graellsii EL83 7CY, May 31 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 09 1996.
Lesser Black-backed Gull graellsii EM41 19CY-20CY, May 23 2014 & March 30 2015, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii EM86 7CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 10 1996.
Lesser Black-backed Gull graellsii EN11 7CY, May 31 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 10 1996.
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.
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.
Lesser Black-backed Gull graellsii ET48 9CY, May 24 2004, Maasvlakte, the Netherlands (51.59N,04.02E). Ringed July 08 1996.
Lesser Black-backed Gull graellsii EU95 6CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 02 1997.
Lesser Black-backed Gull graellsii EX13 6CY, May 23 2002, EMO, Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 03 1997.
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).
Lesser Black-backed Gull graellsii EAY0 7CY, female, May 12 2001, Dintelhaven Maasvlakte, the Netherlands.
Lesser Black-backed Gull graellsii ECL4 8CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E). A bird ringed July 03 1997.
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.
Lesser Black-backed Gull graellsii PN5 adult, May 13 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). Male, probably ringed July 11 1997.
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.
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.
Lesser Black-backed Gull graellsii SV0 17CY, May 02-23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii SX4 17CY, May 02-23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii J7 adult, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
Lesser Black-backed Gull graellsii 1 7 adult, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). 
Lesser Black-backed Gull graellsii E019 6CY & 11CY, May 2004 & Augsut 2009, Maasvlakte & Westkapelle, the Netherlands.
Lesser Black-backed Gull graellsii E022 6CY, May 24 2004, Missouriweg Maasvlakte, the Netherlands (51.59N 04.02E).
Lesser Black-backed Gull graellsii E136 6CY, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E).
Lesser Black-backed Gull graellsii EE328 15CY, May 13 2014, Sassenplaat, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull graellsii E800 6CY,May 2009, Moerdijk, the Netherlands.
Lesser Black-backed Gull graellsii NLA 5.28x.764 13CY, May 12 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E). Probably ringed 1992.
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.
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.
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.
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.
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.
Lesser Black-backed Gull graellsii NLA 5.321.306 9CY, May 27 2003, Dintelhaven, Maasvlakte, the Netherlands (51.59N,04.02E).
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.
Lesser Black-backed Gull graellsii NLA 5.332.974 adult, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N 04.02E). Female.
Lesser Black-backed Gull graellsii NLA 5.404.820 5CY, May 05 2011, IJmuiden, the Netherlands.
Lesser Black-backed Gull graellsii NLA 5.416.820 5CY, May 05 2011, IJmuiden, the Netherlands.
Lesser Black-backed Gull graellsiiNLA 5.417.298 adult, May & June 2015 & March 2016, Boulogne-sur-Mer, NW France. Picture: Jean-Michel Sauvage.
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. 
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.Adult graellsii ringed in winter in Spain.
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Lesser Black-backed Gull graellsii N09V adult, May 02 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.Ringed in Spain, breeding in the Netherlands.
Lesser Black-backed Gull graellsii N0LH adult, May 23 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.Ringed in Spain, breeding in the Netherlands.
Lesser Black-backed Gull graellsii N0LL adult, May 01 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.Ringed in Spain, breeding in the Netherlands.
Lesser Black-backed Gull graellsii N0MM adult, May 10 2018, Europoort (Dintelhaven), the Netherlands.
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.