Barneveld wastedump, 13.02.2009. Photo by Maarten W. Kaales
Ringd by Greg Neubauerg in Wloclawek (52.39'N, 19.08'E) - in central Poland, not Wroclaw which is in SW part.
A Flickr-based weblog concerning sightings of colourringed gulls, illustrated with photo's from an international group of readers and ringers.