This 3rd calendar-year Gull was marked with ring Y[PLKX] as pullus near ZB.Kozielno,Paczków, Poland (50°28'35.8''N, 16°58'54.2''E) on May 25, 2012. This is approximately 900 km east of IJmuiden. Although it was marked in a colony of Caspian Gulls (Larus cachinnans), it is uncertain whether it is a 'pure' Caspian Gull.