Chroicocephalus ridibundus - Black-headed Gull, 2CY
It carries a ring of the Zool. Museum Kaunas, Lithuania. It was ringed on June 17, 2009 as juvenile at Kalviai, Klaipeda, Lithuania (55 38' N, 21 18' E), approx 1160 km from Leiden. It was seen in Leiden regularly in January 2010. It returned the next winter en was seen again on November 28 and December 24, 2010. and March 6, 2011. It reappeared on November 13, 2011 for the third winter. On December 25, 2011 it was marked with the W[E0TY].