Lesser Black-backed Gull (graellsii & intermedius)

(last update: 14-11-2017 )

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lbbg 2cy June
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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

second calendar year: June

First summer (2cy) LBBG can be classified in 3 categories. In the 2cy LBBG May section, we give details about this classification, based on research done last years. Of course, the classification for May applies to June as well. In year 2001, we tried to get more information about the extremes of these classes, especially regarding moult strategy and moult pace.

First type LBBG (local typical 2cy) in June:

The under-parts and head are patterned with bold markings on a dirty base. The partial spring moult involves head and under-parts. By June, birds show neat streaking on head feathers, combined with abraded under-parts (often the vent and flanks).

The scapulars may have been moulted last autumn (as early as September) to anchor patterned second generation feathers. By June, these may be replaced again and the new pattern is largely unpredictable. They may appear adult-like grey or brown-grey, often with a pronounced dark shaft. But the third generation feathers may also show an almost similar pattern as the second generation feathers, again with anchors or barring. 
Some birds may require their first renewed  second generation coverts as late as June. Fresh feathers can be recognized by the white fringe. The juvenile wing-coverts are shed rapidly and new second generation coverts start growing. In some individuals, complete covert-rows have  been shed and the new feathers grow simultaneously. Again, the pattern shows barring or anchors. If the coverts were not moulted on the wintering ground, moult starts with the median covert row, combined by a few inner greater coverts and randomly some lesser coverts (though often in the inner part of the lessers). Normally, this first type LBBG has some remaining juvenile coverts in the carpal edge (outer lesser coverts).

The tail is still largely black-brown and the present rectrices are nearly always juvenile, though central rectrices are shed now.

The bill is mostly blackish with only a slightly paler base. Legs are pink.

All 2cy LBBG show active primary-moult in the inner primaries in the first week of June. On average, towards the end of the month, P4 is growing and P6 is shed.

Above: Classic first type (2CY graellsii type) LBBG, June 24 2013. Head and underparts moulted in spring, now with neat sharply demarcated streaks. No coverts and no tertials replaced on winter grounds, all juvenile prior to northbound migration and now worn. By June, complete moult has started, which is also visible in standing birds: central median coverts are missing, inner median and greater coverts recently replaced again with barred pattern, but note fresh fringes.
Below: First type LBBG, June 24 2013. No coverts and no tertials replaced on winter grounds, all juvenile prior to northbound migration and now worn. By June, complete moult has started, here with P1-P2 new. Simultaneously, outer median coverts are growing (tips just visible), inner median and greater coverts recently replaced again with barred pattern, note cold grey tone, contrasting with bleached pale brown juvenile coverts. Returned from winter grounds with all flight feathers still juvenile and bleached.
Below: several more example "first type 2CY LBBG". Once the complete moult started and new wing-coverts grow in, these new coverts normally show bold patterns.

Second & third type LBBG in June:

These types show a short neck, small rounded head, fine and short bill, short legs (especially tibia) creating a delicate and compact appearance, in some individuals pronounced by the relatively short primary-projection. Also, plumage and timing of moult in wing-coverts and tail-feathers on average are different from the first type. The first type LBBG start moulting coverts and scapulars at a high pace and especially the primary moult may be more advanced than in the second and third type.

We treat the second and third type together, because in June the differences between these two become less obvious as under-parts become white and the exact pattern of scapulars and coverts is hard to detect on the abraded feathers. As said in the 2cy LBBG May Section, these types already replace scapulars and many wing coverts on the wintering grounds. By June, the pattern gets lost and the fringes get worn. 2cy LBBG belonging to these types start growing third generation coverts now. As mentioned before, third generation coverts may resemble second generation coverts in pattern. Here, in these two types, the third generation coverts are often adult-like plain dark-grey (sometimes with an all-black central wedge), unlike the bared or anchored 2nd generation feathers.

Above: June 24 2013. Second and third type LBBG return from winter grounds with extensive moult in coverts and upper tertials. Here, almost all visible coverts and tertials are 2nd generation. Some coverts show a pronounced dark club-pattern, but in general most coverts are simply patterned: greyish-brown with a darker triangle centre / broad shaft-streak. Note that feathers replaced in winter are worn by June.
Below: Same bird. Outer greater coverts missing, now to be replaced for 2nd generation feathers (arrow B). Central median coverts missing, now to be replaced for 3rd generation coverts (A).

Tail-feather moult

The number of moulted rectrices in the winter-quarters is highly variable and subsequently we find large variation in June. Advanced individuals show a complete second generation tail, while others return in a clearly suspended moult-stage. In the winter-quarters, many individuals do not proceed the moult of the rectrices in a descendant sequence, since migrating birds in spring really show every conceivable moult-stage (e.g. R5-6 second generation, while R1-4 are still juvenile, etc).
Some birds do not show fully-grown rectrices, but it is at least not usual to find a tail in active moult by May and early June. Apart from the obvious fresh white tips, the pattern of the second generation rectrices is mostly juvenile-like, but the darker parts are pure black and the pattern is more vermiculated. However, birds with for example a partially white R2, a nearly complete black R3 and with a R4 showing much white, are common. A small minority shows only very little black on the second generation tail-feathers.
The renewed upper-tail coverts are complete white or with some sparse black barring on a white base.

Above: June 24 2013. Second and third type LBBG may return from winter grounds with replaced rectrices.
Below: June 15 2013 (picture Maarten van Kleinwee). Some intermedius-type birds replace secondaries in winter quarters. Such birds return in spring with fresh-looking coverts, tail and secondaries, but by mid-June, they normally show retarded primary moult (about two weeks later in moult than classic graellsii). Here, PMS is only 11.
Below: June 19 2017, Katwijk, the Netherlands. Third type bird, with extensive post-juvenile moult on the wintering grounds, prior to northbound migration. Tail and innerhalf of secondaries included. Overall simply patterned feathers. Just recently the complete moult started by dropping P1, now P1/P4, P2 growing.

Wing-covert moult

The wing-covert moult has mainly been suspended prior to migration, with in most cases a generation contrast between the inner and outer coverts. This especially applies to the greater coverts, which often show a mix of juvenile and 2nd generation coverts, where tertials and median coverts are often already renewed. The moult-stage of lesser coverts is more advanced than the greater coverts, but especially 'upper' lesser coverts are less advanced than the tertials and median coverts. Once returned, many birds start shedding complete covert bars and grow new feathers simultaneously. 

Primary moult

The onset of the primary moult in second and third type 2cy LBBGs in early summer is on average slightly later (1-2 weeks) than in typical first types. Additionally, the individual variation is more pronounced, with e.g. in the third week of June, birds with only P1-2 missing and birds which already shed P7. However, in comparison with the first type, differences in timing of primary moult is usually not significant.

Below: May 15 2010 (picture Amir Ben Dov). If 2CY LBBG arrive in spring with all feather tracts replaced, nominate fuscus is involved.

Tables

Primary moult score of 2cy LBBG June 26 2003, at Dannes gravel pit, NW France (50.42N,01.34E).
. no new P1 fg P2 fg P3 fg P4 fg ? fg n:
P3-P10 1 - - - - 1 2
P4-P10 - - - - - 3 3
P5-P10 - - 1 - - 5 6
P6-P10 - - 4 4 - 9 17
P7-P10 - - 1 2 5 4 12
n: 1 - 6 6 5 22 40
n = 40; m old P = 5.2; SD old P = 1.10.
P6-P10 = P6-P10 are still old and present.
? fg = fully grown not known. Often referring to sleeping birds with folded wings, so fully grown primary score most probably P6 or less.
fg = fully grown. In our field surveys, a primary is 'fully grown' when it exceeds the previous feather in the folded wing. Actually,  such 'fully grown' feathers may have to grow a little, but under field circumstances, it's very difficult to find out if the waxy sheath, which is the standard measurement for fully grown primaries, is still present. 

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2cy LBBG from the UK: graellsii
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Lesser Black-backed Gull graellsii 0R0:C 2CY, June & July 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 3R9:C 2CY, June 26 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 5H2:C 2CY, June 05 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 7G1:C 2CY, June 21 2016, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 030:F 2CY, May 16 - June 01 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii A:D58 2CY, June - September 2016, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii F:234 2CY, June - October 2016, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii F:367 2CY, June 16 - August 17 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii F:410 2CY, May 30 - July 18 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 0CS7 2CY, June 19 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 0FF6 2CY, April - September 2016, Matosinhos, Portugal. Picture: José Marques.
ad LBBG in Januari-April, ringed in the U.K. (72074 bytes)Lesser Black-backed Gull graellsii 1CP5 2CY, January - June 2015, Matosinhos Beach, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 2FJ1 2CY, May 30 - June 01 2017, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 3CS3 2CY, June 05 - 19 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 7FJ7 1CY-2CY, September 2016 & May-June 2017, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 8FJ4 2CY, January - July 2017, Matosinhos beach, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 9CK0 2CY, June 26 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 9FF3 2CY-3CY, March 2016 - March 2017, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 9FK5 2CY, June & July 2017, Matosinhos beach, Matosinhos, Portugal. Picture: José Marques.
ad LBBG in Januari-April, ringed in the U.K. (72074 bytes)Lesser Black-backed Gull graellsii NDN.U 2CY-3CY, March 2015 - March 2016, Matosinhos, Portugal. Picture: José Marques.
2287fd.jpg (60741 bytes)Lesser Black-backed Gull graellsii M+R 2CY, June 23 2017, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii K+T 2CY, June 05 - 26 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
2287fd.jpg (60741 bytes)Lesser Black-backed Gull graellsii FD 2CY, June 26-28 2003, Boulogne-sur-Mer, France (50.42N,1.34E). Mint-green ring from Britain.
juvenile LBBG, ringed in the Netherlands.Lesser Black-backed Gull JN7T 2CY, June - December 2013, Koksijde, Belgium. Picture: Peter Adriaens.
Lesser Black-backed Gull graellsii BTO GV24267 2CY, June 16 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
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2cy LBBG from France: graellsii
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3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii 3:AES 2CY, June 19 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 3:CWT 2CY, March - June 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 3:DAN 2CY, June 09-16 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 3:DEA 2CY, March - June 2017, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 3:DGG 1CY-2CY, September 2016 & June 2017, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii 3:DNR 1CY-2CY, September - June 2017, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii R:V7K 2CY-3CY, June 2015 & July 2016, Praia de Mira, Coimbra, Portugal. Picture: José Marques.
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2cy LBBG from Belgium: graellsii "Dutch intergrade"
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Lesser Black-backed Gull graellsii RN.AU 2CY-3CY, June 2016 - March 2017, Aveiro, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii ZPA.N 1CY-2CY, November 2016 & March-June 2017, Matosinhos, Portugal. Picture: José Marques.
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2cy LBBG from the Netherlands: graellsii "Dutch intergrade"
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1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii Y.CDV 2CY, June 18 2017, Utrecht, the Netherlands.
Lesser Black-backed Gull graellsii 8||= 2CY, June 01 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii S||8 2CY, June 22 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull graellsii X||J 2CY, June 29 2017, Utrecht, the Netherlands.
Lesser Black-backed Gull graellsii H5 2CY, June 07 2016, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii J3 2CY, June & October 2016, Douro River Estuary, Porto, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii T.P 2CY, June 19 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
1301re528.jpg (84694 bytes)Lesser Black-backed Gull graellsii E528 2CY, June 13 & 14 2002, Boulogne-sur-Mer, France (50.42N, 1.34E). P4 is juvenile, P2 is growing. The tail is juvenile.
2cy LBBG, ringed in the Netherlands. Lesser Black-backed Gull graellsii C95 E 2CY, June 26 2004, Amsterdam, the Netherlands.
2cy LBBG, ringed in the Netherlands. (94332 bytes)Lesser Black-backed Gull graellsii F40 E 2CY, June 30 2005, Amsterdam, the Netherlands.
2cy LBBG, ringed in the Netherlands. (65913 bytes)Lesser Black-backed Gull graellsii 5.179.990 2CY, June 12 2005, Amsterdam, the Netherlands. Pullus born near Amsterdam.
2cy LBBG, ringed in the Netherlands. (100770 bytes)Lesser Black-backed Gull graellsii 5.412.311 2CY, June 15 2005, Amsterdam, the Netherlands. Pullus born in IJmuiden.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 5.418.124 2CY, June 20 2009, Amsterdam, the Netherlands. Picture: Ruud Altenburg.
juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull graellsii 5.440.093 2CY, June 20 2009, Amsterdam, the Netherlands. Picture: Ruud Altenburg.
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2cy LBBG from N Germany: graellsii - intermedius
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1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii HAK26 2CY, June 18 2017, Utrecht, the Netherlands.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii HE6E2 2CY, June 12 2016, Utrecht, the Netherlands.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii HE7E3 1CY-3CY, October 2015 - March 2017, the Netherlands & Portugal. Picture: Mars Muusse & José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull graellsii HEH87 2CY, June 05 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii HN83C 2CY, June 12 2016, Utrecht, the Netherlands.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull graellsii 2cy H460 June 20 2008, Westkapelle, the Netherlands.
Lesser Black-backed Gull graellsii 2cy DEH N031118 June-August 2012, Boulogne sur mer, NW France. Picture: Jean-Michel Sauvage.
Lesser Black-backed Gull graellsii 2cy DEH 4279xxx June 24 2013, Noordwijk, the Netherlands.
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2cy LBBG from Denmark: intermedius
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juvenile LBBG in October, ringed in Norway. (131273 bytes)Lesser Black-backed Gull intermedius V247 2CY, June 20 2009, Amsterdam, the Netherlands. Picture: Ruud Altenburg.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull intermedius V.E1E 2CY, June 04 2011, Leiden, The Netherlands (52.164N, 4.499E). Picture: Maarten van Kleinwee.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull intermedius VP6K 2CY, June 16 2013, Noordwijk, the Netherlands. Picture: Ruud Altenburg.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull intermedius V.X5R 2CY, June 19 2015, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
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2cy LBBG from Norway: intermedius
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3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull intermedius JM4E 2CY, June 16 2013, Noordwijk, the Netherlands. Picture: Ruud Altenburg & Maarten van Kleinwee.
1cy argenteus in November, ringed in Belgium. (25637 bytes)Lesser Black-backed Gull intermedius J287H 2CY, June 18 2017, Utrecht, the Netherlands.
Lesser Black-backed Gull intermedius J625V 2CY, June 09 2017, Matosinhos beach, Matosinhos, Portugal. Picture: José Marques.
3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull intermedius J661E 2CY, June 20 2014, Tilburg, the Netherlands. Picture: Merijn Loeve.
Lesser Black-backed Gull intermedius J665R 2CY, June 22 2017, Leixões Harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull intermedius J779N 2CY, May 30 - June 01 2017, Leixões harbour, Matosinhos, Portugal. Picture: José Marques.
Lesser Black-backed Gull intermedius J804R 2CY, June 11 2017, Castricum, the Netherlands. Picture: Ruud Altenburg.
2cy LBBG from Norway. (71201 bytes)Lesser Black-backed Gull intermedius J7N5 2CY, June 28 2003, Boulogne/Mer, NW France.
1674jxu7.jpg (64892 bytes)Lesser Black-backed Gull intermedius JXU7 2CY, June 18 2002, Papegaaienbek - Maasvlakte, the Netherlands.
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2cy LBBG from Sweden: intermedius
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2cy LBBG from Sweden. (92672 bytes)Lesser Black-backed Gull intermedius SVS 8106930 2CY, June 12 2005, Amsterdam, the Netherlands. From Sweden.
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2cy LBBG June: ringed in winter
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3cy graellsii LBBG in June, ringed in the Netherlands. (135385 bytes)Lesser Black-backed Gull N09C 2cy, June 16 2013, Noordwijk, the Netherlands. Picture: Frank van der Meer.
Lesser Black-backed Gull graellsii M:086 2CY, June - July 2016, Praia de Mira, Coimbra, Portugal. Picture: José Marques.
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2cy LBBG June: unringed
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2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 01 2017, Utrecht, the Netherlands. Complete moult not started: P1-P10 old. New tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 01 2017, Utrecht, the Netherlands. Complete moult started: P1/P3. New tail, new secondaries.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 01 2017, Utrecht, the Netherlands. Complete moult started: P1/P3. New tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P1/P3, new tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P5, new tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P1/P3.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P3.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P3.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P3.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P1/P3.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P1/P4.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P1/P4.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P4.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P5, new tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 18 2016, Katwijk, the Netherlands. Complete moult started: P1/P5. New tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 18 2016, Katwijk, the Netherlands. Complete moult started: P1/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P1/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P1/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P1/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P1/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P6, new tail.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P3/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P3/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 10 2013, Noordwijk, the Netherlands. Complete moult started: P2/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P3/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P3/P7.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P3/P7.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P3/P7.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P4/P7.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 15 2013, Noordwijk, the Netherlands. Complete moult started: P2/P4. Replaced secondaries in winter. Picture: Maarten van Kleinwee.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 01 2017, Utrecht, the Netherlands. Complete moult started in winter like fuscus: P4/P6. New tail, new secondaries.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 07 2013, Noordwijk, the Netherlands. Complete moult started in winter like fuscus, then arrested at P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 07 2013, Noordwijk, the Netherlands. Complete moult finished in winter like fuscus.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 26 2003, Boulogne-sur-Mer, France (50.42N, 1.34E). 2nd gen primaries, possible fuscus.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 18 2017, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 18 2017, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 18 2017, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, May 27 - June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 13 2016, Katwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 19 2017, Katwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands. P3/P6.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
Lesser Black-backed Gull 2CY, June 29 2017, Utrecht, the Netherlands.
Lesser Black-backed Gull 2CY, June 29 2017, Utrecht, the Netherlands.
Lesser Black-backed Gull 2CY, June 29 2017, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 04 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 10 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2CY, June 12 2016, Utrecht, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy June 24 2013, Noordwijk, the Netherlands.
1286.jpg (68670 bytes)Lesser Black-backed Gull 2cy, June 14 2002, Boulogne-sur-Mer, France (50.42N,1.34E). P7 is still old. The dark 'shadow-print' of P6 is still visible on P7.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P2/P5.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands. Complete moult started: P7-P10 old juvenile.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.
2172.jpg (51826 bytes)Lesser Black-backed Gull 2cy, June 24 2013, Noordwijk, the Netherlands.