Herring Gull- Zilvermeeuw (argentatus & argenteus)

(last update: 8-2-2007)


Herring Gull plumages:

hg 1cy July
hg 1cy August
hg 1cy September
hg 1cy October
hg 1cy November
hg 1cy December

hg 2cy January
hg 2cy February
hg 2cy March
hg 2cy April
hg 2cy May
hg 2cy June
hg 2cy July
hg 2cy August
hg 2cy September
hg 2cy October
hg 2cy November
hg 2cy December

hg 3cy January
hg 3cy February
hg 3cy March
hg 3cy April
hg 3cy May
hg 3cy June
hg 3cy July
hg 3cy August
hg 3cy September
hg 3cy October
hg 3cy November
hg 3cy December

hg sub-ad January
hg sub-ad February
hg sub-ad March
hg sub-ad April
hg sub-ad May
hg sub-ad June
hg sub-ad July
hg sub-ad August
hg sub-ad September
hg sub-ad October
hg sub-ad November
hg sub-ad December

hg ad January
hg ad February
hg ad March
hg ad April
hg ad May
hg ad June
hg ad July
hg ad August
hg ad September
hg ad October
hg ad November
hg ad December

Herring 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 resembles argenteus
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 Gull-like bill.
(In the back: two Mediterranean Gulls and a yellow-legged Common Gull).