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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
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3cy January
HG 3cy February
HG 3cy March
HG 3cy April
HG 3cy May
HG 3cy June
HG 3cy July
HG 3cy August
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HG 3cy October
HG 3cy November
HG 3cy December
HG
sub-ad Jan.
HG sub-ad Feb.
HG sub-ad March
HG sub-ad April
HG sub-ad May
HG sub-ad June
HG sub-ad July
HG sub-ad Aug.
HG sub-ad Sept.
HG sub-ad Oct.
HG sub-ad Nov.
HG sub-ad Dec.
HG
adult January
HG adult February
HG adult March
HG adult April
HG adult May
HG adult June
HG adult July
HG adult August
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HG adult October
HG adult November
HG adult December
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Herring Gull
5.359.457
adult (argenteus), March
18 2002, Missouriweg, Maasvlakte, the Netherlands (51.59N,04.02E).
A Dutch ringed adult:
Arnhem 5.359.457. A typical Dutch argenteus. Ringed
February 01 2002 at Westduinen, Den Haag as (near) adult (at least older
than 3cy).
Both are adult argenteus
with complete white heads, all winter streaking lacking. Adult argenteus
may already return to the colonies in
January-February,
maybe depending on the weather conditions (mild winters north
to 53° latitude along the coast of the North Sea). It's unknown in what way and to what extend
weather conditions influence body feather moult, but from January onwards,
adults may appear with snow-white heads. From late January and
certainly from the first week of February, males start defending
territories on the roofs of the industrial complexes in the harbour of
IJmuiden and in the colonies of the Maasvlakte, near Rotterdam.
From the second week of February onwards, adult argenteus from
the Netherlands are in active moult on the head. This is often obvious in
the feathers around the eye, which are shed by the second week of
February, leaving a naked ring around the eye (visible at close range).
Note the orange orbital ring and the limited black on the bill (possible
in full adult birds).
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Herring
Gull - Zilvermeeuw (argentatus & argenteus)