Chroicocephalus ridibundus - Black-headed Gull
This 1st CY Black-headed Gull carries a Polish ring. It was ringed as pullus on June 20, 2010 in the kolonia legowa near Szamocin, Wielkopolskie, Poland (53° 04' 27N, 17° 07' 12E), approximately 857 km from Oegstgeest. The Oegstgeest observation was the first reported sighting of this animal.