Herring Gull- Zilvermeeuw (argentatus & argenteus)

(last update: 5-2-2010)


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

(2 images) Herring Gull 5.352.764 2cy (argenteus), January 19 - February 04 2003 , IJmuiden, the Netherlands (52.27N-04.33E). 

It was ringed as pullus, early in the season on May 31 2002 at IJmuiden (52.28N 04.35E).

below: 2cy 5.352.764 (argenteus), January 19 2003 , IJmuiden, the Netherlands (52.27N-04.33E). 

This is an example of typical Dutch argenteus by mid-January: a bird ringed Arnhem 5.352.764 and it shows the average moult score. The mantle and upper scapulars have been replaced and the smudgy grey centres have already turned pale buffish; now contrasting with the brown anchor or barred pattern. The white fringes on the older feathers are worn away. Last moulted feathers can be found in the lowest row of lower scapulars. Base colour of these feathers is buffish-grey and they do not contrast as obviously as the older feathers. In many cases, a few lowest scapulars are still juvenile. In this individual, the juvenile rear lowest scapulars are clearly visible: all-brown with strong abrasion in the fringe. 
The head and breast have been moulted for second generation as well, but all other feathers are still juvenile. Commonly, the juvenile tertials, the inner greater and the inner median coverts show much wear. The white notches along the fringes wear away easily by a lack of pigmentation (which makes dark feather parts stronger) and the smooth feather edge may turn in a 'stamp-edge', the brown pigmented parts remain and protrude, including the central shaft. The outer coverts look much better conserved with a neat edge, the outermost greater coverts protected by the flank feathers and the feathers of the side-breast.
The juvenile primaries are clearly pointed, unlike the rounded remiges shown by so-called "second winter" birds. The iris remains brown-black as in juvenile plumage, but in quite some birds the bill already turns paler at the basal half by mid-January. 

below: 2cy 5.352.764 (argenteus), February 04 2003 , IJmuiden, the Netherlands (52.27N-04.33E). 

below: 5cy 5.352.764 (argenteus), August 12 2006 , IJmuiden, the Netherlands (52.27N-04.33E). 

Note the dark markings on the primary coverts. P7-P10 still old.