Chroicocephalus ridibundus - Black-headed Gull
This Black-headed Gull was ringed as 1st CY male on 22 November 2008 in Svanemøllebugten, København, Denmark (55.43N-012.35E). It has since been reported only from Leiden en København. It was found dead in Oegstgeest (near Leiden) on January 30, 2013.