Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans? hybrid 2CY 77P2 May 17 2007, Łubna landfill, Poland. Picture: Ruud Altenburg.
Ringed as a pullus on May 10 and again on June 07 2006 in the mixed colony of Wisla reservoir - Wloclawek, Poland (52°39'N, 19°08'E).
Green 77P2, probable hybrid Caspian Gull L cachinnans x Herring Gull L argentatus, but parentage not known and pictures show a bird that much resembles argentatus.