Lesser Black-backed Gull (graellsii & intermedius)
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.
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.
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.
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
|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 L-108932 3cy July 09 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.|
|LBBG 5.362.238 3cy July 05 2005, Amsterdam, the Netherlands. Picture Ruud Altenburg.|
|LBBG 5.412.037 3cy July 17 2005, Amsterdam, the Netherlands.|
|LBBG 5.412.042 3cy July 17 2005, Amsterdam, the Netherlands.|
|LBBG 5.414.464 3cy July 04 2005, Amsterdam, the Netherlands.|
|LBBG 5.462.260 3cy July 20 2012, Barneveld Waste dump, the Netherlands. Picture: Maarten van Kleinwee.|
|LBBG 3.K 3cy July 11 2013, Utrecht, the Netherlands. Picture: Frank van der Meer.|
|LBBG 4.H 3cy July & August 2013, Utrecht, the Netherlands. Picture: Herman Bouman.|
|LBBG JL 3cy July 29, 2011, Barneveld, the Netherlands. Picture Maarten van Kleinwee.|
|LBBG K5 3cy July 13 2005, Dordrecht, the Netherlands.|
|LBBG PCAC 3cy July 06 2008, Amsterdam, the Netherlands. Picture: Ruud Altenburg.|
LBBG 3cy Norway: intermedius
|LBBG J4A3 3cy July 25 & August 21 2003, IJmuiden, the Netherlands.|
|LBBG J7EU 3cy July 26 2011, Barneveld, the Netherlands. Picture: Herman Bouman.|
|LBBG JJ6L 3cy July & August 2013, Utrecht, the Netherlands. Picture: Herman Bouman.|
|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
|LBBG 3cy July 06 2001, IJmuiden, the Netherlands. In many respects fuscus-like.|
| LBBG 3cy July 07 2001, IJmuiden, the Netherlands. Arrested moult. Grey tone like graellsii.