Herring Gull (argentatus & argenteus)
(last update: February 11, 2013)
Herring Gull (argenteus) NLA 5.361.238 5CY & 16CY, March 2004 & October 2015, Brouwersdam, the Netherlands.
Herring Gull ringed as pullus on July 02 2000 at 3 Oesterdam, Tholen, Zeeland, Nederland (51° 30' 22 N, 4° 11' 4 E).
below: Herring Gull (argenteus) NLA 5.361.238 16CY, October 23 2015, Brouwersdam, the Netherlands.
Bird in complete moult: P8 fully grown.
below: Herring Gull (argenteus) NLA 5.361.238 5CY, March 10 2004, Brouwersdam, the Netherlands.
The head is complete white, all winter streaking absent. Adult argenteus may already return to the colonies in
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.