Chroicocephalus ridibundus - Black-headed Gull, 12CY

This bird was ringed with a metal ring and the color ring Yellow[2M], as 1 CY on December 21, 1999, in Groningen, The Netherlands. This bird is in its 12th calendar year. So far, the bird has been reported from Groningen and Leiden only. The ring was yellow originally but is discolored and appears white. Wear damaged the ring, and the backside of the ring is gone. On November 28, 2010 this gull was seen again in Leiden by Maarten van Kleinwee, and identified by its metal ring. Indeed, the yellow plasic ring [2M] had been lost. On december 25, 2011 it was ringed again in Leiden with W[E0TV]. Also a new metal ring was added at the tibia.