Gull 3cy (argentatus),
January 04 2002, Le
Portel / Boulogne-sur-Mer, France (50.42N,1.34E).
A 3cy argentatus,
showing more or less plain grey upper scapulars and a vermiculated pattern
on most of the wing-coverts and tertials. In this respect, it somewhat
In many argentatus, the scapulars show a delicate fine black pattern on a very pale base
by January. The new
third generation upper scapulars
are not plain adult-like grey as in most argenteus, but the third generation feathers strongly
resemble second generation feathers.
Compared to argenteus, argentatus may show finer, more
delicately black-patterned feathers, not as bold and smudgy as many argenteus
show (especially in the second generation central greater coverts).
Note the primaries with rounded tips, clearly second generation
feathers and unlike the pointed juvenile remiges. Looking closer, P10
shows a faint mirror, a feature definitely lacking in juvenile feathers.
Second generation primaries with a mirror on P10 can be found in quite
some argentatus (and is very rare in argenteus).
This individual has replaced none of the wing-coverts in the
partial autumn moult as 2cy bird. Note the Glaucous
(In the back: two
Mediterranean Gulls and a yellow-legged Common Gull).