Lesser Black-backed Gull (graellsii & intermedius)

(last update: 09-06-2013)

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LBBG rings

lbbg 1cy May
lbbg 1cy June
lbbg 1cy July
lbbg 1cy August
lbbg 1cy September
lbbg 1cy October
lbbg 1cy Nov - Dec

lbbg 2cy Jan-Febr
lbbg 2cy Mar-April
lbbg 2cy May
lbbg 2cy June
lbbg 2cy July
lbbg 2cy August
lbbg 2cy September
lbbg 2cy October
lbbg 2cy Nov - Dec

lbbg 3cy Jan-April
lbbg 3cy May
lbbg 3cy June
lbbg 3cy July
lbbg 3cy August
lbbg 3cy September
lbbg 3cy October
lbbg 3cy Nov - Dec

lbbg sub-ad Jan-April
lbbg sub-ad May
lbbg sub-ad June
lbbg sub-ad July
lbbg sub-ad Aug
lbbg sub-ad Sept
lbbg sub-ad Oct
lbbg sub-ad Nov - Dec

lbbg ad January
lbbg adult February
lbbg adult Mar-April
lbbg adult May
lbbg adult June
lbbg adult July
lbbg ad August
lbbg ad September
lbbg ad October
lbbg ad Nov - Dec


third calendar year: July

By July, most 3cy LBBG show very slow continuation in their moult. Some replace mantle-feathers, scapulars and coverts. Most have adult-like bare parts and under-parts.

Moult of coverts 

In most individuals, which may represent Dutch graellsii, at least the median coverts are actively moulted to adult-like grey feathers. Also, most birds start replacing tertials, lesser and greater coverts, from the end the month onwards. Throughout August and September, moult in the wing-coverts continues and by October most LBBG show a complete grey wing.
New coverts are often easily recognized; third generation feathers are typically uniformly grey, like in adult plumage.
The old retained second generation feathers show at least some brown markings in the centre and white fringes (although these fringes may be worn away and the exact pattern gets lost).

Tail-feather moult

As can be seen in the images of fresh third generation tails, there may be some variation in black and white division. Worn second generation rectrices are commonly seen at this age by July, i.e. a tail with a lot of black, at least with a broad black terminal tail-band.
During summer, the moult of  tail feathers may be either absent or already be finished. Some fresh 3rd generation tail feathers still show isolated black spots, often on the outer webs of the tail-feathers R4 or R5.

Primary moult

Early July, some 3cy LBBG have already shed P4 and replaced P2 for a fresh adult-like primary. At the end of July some birds turn up with P5 replaced while P7 has been shed. The new third generation primaries are very adult-like grey with a white tip, totally different from the old abraded plain black-brown second generation primaries.
Still, the third generation primaries differ slightly from real adult primaries as the tips are marginally smaller, the mirror on P9 is often absent, the size of the mirror on P10 is smaller and P3 and P4 show extensive sub-terminal black markings (a complete sub-terminal band on p3 and p4 is common). Of course, the outer primaries are still old and completely third generation remiges are expected by November. Another indication for third generation primaries being different from adult ones comes with time; later on in the season the outer primaries quickly turn brown. Full adult birds show blackish P5-P10. With age the feathers look to be stronger, making them less vulnerable for bleaching and wear. Secondary moult starts later in the season.

Of course, the outer primaries are still old and the completion to third generation remiges are expected by November. Another indication for third generation primaries being different from adult ones comes with time; later on in the season the outer primaries quickly turn brown. Full adult birds show blackish P5-P10. With age the feathers look to be stronger, making them less vulnerable for bleaching and wear. Secondary moult starts later in the season.

Some remarks on primary moult.

Normally, the partial spring moult in graellsii and intermedius LBBG doesn't include the remiges. For a detailed description of this partial spring moult, see the May section. Again in July (as we saw in May and June), 3cy LBBG were encountered showing arrested moult, probably from last winter, prior to northbound migration. A full page is dedicated to discus these odd LBBG (see the page 'discusfus').


LBBG 3cy U.K.: graellsii
3cy LBBG graellsii in July, ringed in the U.K. (123213 bytes)LBBG W2XN 3cy July 11 2005, Neeltje Jans, the Netherlands. Picture Pim Wolf.
LBBG T069 3cy July 24 2013, Utrecht, the Netherlands. Picture: Herman Bouman.

LBBG 3cy France: graellsii
LBBG 419N 3cy July 19 2008, Calais, NW France. Picture: Jean-Michel Sauvage.


LBBG 3cy Belgium: graellsii / Dutch intergrade

3cy LBBG graellsii in July, ringed in Belgium. (91360 bytes)LBBG L-106x34 3cy July 05 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.

3cy LBBG graellsii in July, ringed in Belgium. (121234 bytes)LBBG L-108932 3cy July 09 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.


LBBG 3cy the Netherlands: graellsii / Dutch intergrade

 

3cy LBBG graellsii in July, ringed in the Netherlands. (99165 bytes)LBBG 5.362.238 3cy July 05 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.
3cy LBBG graellsii in July, ringed in the Netherlands. (102962 bytes)LBBG 5.412.037 3cy July 17 2005, Amsterdam, the Netherlands.
3cy LBBG graellsii in July, ringed in the Netherlands. (84568 bytes)LBBG 5.412.042 3cy July 17 2005, Amsterdam, the Netherlands.

3cy LBBG graellsii in July, ringed in the Netherlands. (68419 bytes)LBBG 5.412.153 3cy July 03-09 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.

3cy LBBG graellsii in July, ringed in the Netherlands. (142178 bytes)LBBG 5.414.464 3cy July 04 2005, Amsterdam, the Netherlands.
3cy LBBG graellsii in July, ringed in the Netherlands. (142178 bytes)LBBG 5.462.260 3cy July 20 2012, Barneveld Waste dump, the Netherlands. Picture: Maarten van Kleinwee.
3cy LBBG graellsii in July, ringed in the Netherlands. (142178 bytes)LBBG 3.K 3cy July 11 2013, Utrecht, the Netherlands. Picture: Frank van der Meer.
3cy LBBG intermedius in July & August, ringed in Norway. (73514 bytes)LBBG 4.H 3cy July & August 2013, Utrecht, the Netherlands. Picture: Herman Bouman.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG JL 3cy July 29, 2011, Barneveld, the Netherlands. Picture Maarten van Kleinwee.
3cy LBBG graellsii in July, ringed in the Netherlands. (91524 bytes)LBBG K5 3cy July 13 2005, Dordrecht, the Netherlands.
juvenile LBBG in October, ringed in Norway. (131273 bytes)LBBG PCAC 3cy July 06 2008, Amsterdam, the Netherlands. Picture: Ruud Altenburg.

LBBG 3cy Norway: intermedius
3cy LBBG intermedius in July & August, ringed in Norway. (73514 bytes)LBBG J4A3 3cy July 25 & August 21 2003, IJmuiden, the Netherlands.
3cy LBBG intermedius in July & August, ringed in Norway. (73514 bytes)LBBG J7EU 3cy July 26 2011, Barneveld, the Netherlands. Picture: Herman Bouman.
3cy LBBG intermedius in July & August, ringed in Norway. (73514 bytes)LBBG JJ6L 3cy July & August 2013, Utrecht, the Netherlands. Picture: Herman Bouman.
juvenile LBBG in September, ringed in Norway. (73485 bytes)LBBG JZZ72cy-3cy-4cy 2010-2012. Pictures Christian Pedersen, Maarten van Kleinwee & Theo Muusse.
 
LBBG 3cy unringed
 
LBBG 3CY, July 18 2013, Katwijk, the Netherlands. P4/P6.
LBBG 3CY, July 18 2013, Katwijk, the Netherlands. P3/P6.
LBBG 3CY, July 18 2013, Katwijk, the Netherlands. P2/P4.

LBBG 3cy with arrested moult
5254.jpg (118341 bytes) LBBG 3cy July 06 2001, IJmuiden, the Netherlands. In many respects fuscus-like.
5346.jpg (100073 bytes) LBBG 3cy July 07 2001, IJmuiden, the Netherlands. Arrested moult. Grey tone like graellsii.