Herring Gull - Zilvermeeuw (argentatus & argenteus)

(last update: 21 februari 2004)

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Herring Gull YAPF adult (argenteus), August 13 & 24 2010, IJmuiden, the Netherlands.

A local adult argenteus, ringed as breeding adult on the nest, at IJbunker - IJmuiden 14 May 2010.

The IJmuiden Ringing Team (Fred & Kees) ringed Herring Gulls and Lesser Black-backed Gulls at Forteiland, IJmuiden in 2008-2011, using green darvic rings, starting with Y for borh species (so codes read Y.xxx).
Early in the season (May), adults were caught at the nests and ringed, late June the juveniles were caught and ringed as well.

This page shows an example of birds from this IJmuiden project. All observations of ringed birds from this project can be sent to Kees Camphuysen at NIOZ, Texel (mail camphuys at nioz dot nl).

From June to December, adult argentatus undergo a complete moult resulting in so-called "winter plumage". By August, the first neat streaks can be found on the crown and hind-neck. After the complete moult is finished by late autumn, the head will show extensive 'winter streaking', often neat fine streaking in sub-adult argentatus. 
By the end of the complete moult (sometimes mid-January in argentatus), the scapulars, mantle, all the wing-coverts, rectrices and remiges will be replaced. From June onwards, the new plain grey wing-coverts are moulted in, starting with the outermost median coverts. 

P7-P10 still old.

above: 13 August 2010

below: 24 August 2010

P8-P10 old.