Herring Gull- Zilvermeeuw (argentatus & argenteus)
Herring Gull plumages:
hg sub-ad January
Herring Gull H-117858 3cy (argenteus), March 16 2003, Le Portel / Boulogne-sur-Mer, France (50.42N,1.34E).
A typical argenteus,
ringed as pullus on July 20 2001 at Zeebrugge, Belgium (51.20N 03.11E), Bruxelles H-117858.
of the scapulars
are plain adult-like grey, contrasting with the barred lesser coverts, but
creating a saddle effect. The bill is typical for 3cy birds in March,
pinkish base and a broad bill-band. Note
the rather brown second generation primaries lacking the mirror on P10.
The tail is completely second generation, showing a broad band.
3cy argenteus has
a partial moult in spring. It starts in January and is completed by April,
leaving birds in so-called "second summer" plumage. The head
turns white, especially on throat, breast and belly. By April, the
scapulars and mantle will show many adult-like grey feathers, often
creating a contrasting "grey saddle", as most of the
wing-coverts (especially the lesser coverts) are still barred. The old
second generation wing-coverts start to fade and the fringes wear off.