2cy intermedius JXU7 June 18 2002, Papegaaienbek - Maasvlakte, the Netherlands.
Here you find third type 2cy LBBG with a very pale head and an almost completely second generation plumage.
The bill has a small pale tip and the base of the
lower mandible turns yellow already. The legs are
distinctly short and in general it's a small, pot-bellied and 'neck-less' individual,
originating from an intermedius population in Norway.
Primary moult is at an average stage for 2cy LBBG in the Netherlands, with P5 still juvenile. The tail-feather have all been moulted to fresh second generation feathers, showing a neat white tip, except R5, which is still juvenile.
Most of the wing-coverts and tertials were moulted in one wave, as most of these feathers have a relatively same degree of wear in the fringes. Such a moult strategy on the wintering grounds can be found in heuglini as well (see e.g. this 2cy heuglini in Bahrain, this one and this one) and must be common in fuscus. All tertials were included in the post-juvenile moult last winter and the tips show slight wear already in the fringes (though the better protected lower tertials appear pretty neat).
The inner 11 greater coverts were moulted to second generation, while #12 and greater coverts further outwards are still juvenile. These juvenile coverts have the fringes completely worn away and can be recognized by the warm brown centres. The outer greater coverts (hidden by the flank feathers are missing and this bird follows a moult strategy inwhich the outer greater coverts grow inwards towards the central feathers. Greater covert #2 is probably missing and #3 looks much fresher than #1 and #4. As can be seen in the picture, the central greater coverts look relatively dark and fresh compared to the inner coverts and the medians directly above the central greaters.
In the median coverts, the moult strategy is difficult to ascertain, as many feathers are of uneven length and show different stages of wear. Median covert #1 has been replaced very recently and is dark grey (this feather is hardly visible, just beneath the first lower lesser covert). All other inner and central median coverts have a simple pattern of a brown base, bleached towards the fringe with a wedge-shaped dark centre.
In the lower lesser coverts two feathers stand out as fresher with a grey base (not as pale brown as the other feathers). Lower lesser covert # 3 has a broad dark central wedge and #11 is darker than surrounding coverts with an ill-defined dark shaft. In the lesser coverts seven feathers appear darker and are probably moulted last. In the carpal edge a few feathers are still juvenile.
Lesser Black-backed Gulls (like many other large white-headed gulls) normally
have the last juvenile wing-coverts concentrated in the central greater coverts
and the small lesser coverts in the upper row and carpal edge.
In the scapulars, most feathers show a base colour and pattern similar to the wing-coverts. The rear lower scapulars have a broad dark central wedge, but in most other scapulars the shaft is a neat black line in the otherwise pale brown feathers. Eight scapulars have been replaced for all dark third generation feathers. The lowest row of lower scapulars (normally moulted late in the season and last in line in the scapular area) consists of all brown second generation feathers and holds a strong clue for these dark feathers to be of third generation.
Blue with white code
Ringnumber 4240027 Ringer Tor Oddvar Hansen
Species Lesser Black-backed Gull (Larus fuscus intermedius)
Sex X Age Pull Date 18.07.2001
Place Rauna, Farsund, Vest-Agder, NORWAY Co-ordinates 58.03 N - 06.40 E
Maasvlakte, Rotterdam, Zuid-Holland, NETHERLANDS
51.59 N - 04.01 E
15.08.2003 Tarragona, Tarragona, SPAIN 41.07 N - 01.15 E Albert Cama Torrell
16.08.2003 Tarragona, Tarragona, SPAIN 41.07 N - 01.15 E Albert Cama Torrell