Herring Gull- Zilvermeeuw (argentatus & argenteus)
Herring Gull plumages:
hg sub-ad January
Herring Gull 5.365.545 3cy (argenteus), April 05 2003, Brouwersdam, the Netherlands (51.45N-03.52E).
This Dutch Herring Gull
was ringed as pullus on July 01 2001 at Zoommeer, the Netherlands (51.30N 04.11E).
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, creating a
contrasting "grey saddle" in many birds, as most of the wing-coverts
(especially the lesser coverts) are still barred. The wing-coverts start
to fade and the fringes wear off.
The image presents a typical argenteus,
although still not showing the grey saddle. The brown second generation primaries
are bleached and lack a mirror on P10. The second generation tail has a broad dark