Rooftop breeding colonies can be found at numerous locations in Europe, and may include species like Herring, Lesser Black-backed, Yellow-legged or Great Black-backed Gull. But Caspian Gulls have started doing this as well. In two districts in the Polish capital Warsaw they established breeding colonies on rooftops. Both locations, Warszawa-Targówek & Warszawa-Mokotów, hold mixed species and for the moment breeding numbers are still low. However, the famous Caspian Gull colony of Gatovo in Minsk, Belarus illustrates the potential of such rooftop colonies for the next decade. We hope to document this early stage of rooftop colonisation in Poland, and first data can be found on the “small colonies” page under: Warszawa-Mokotów.

Caspian Gulls nesting in a mixed colony with other large gull species on 6-store apartment building in 2018 in Mokotów –
Mewy białogłowe gniazdujące w mieszanej kolonii z innymi gatunkami dużych mew na dachu 6-pietrowego budynku w dzielnicy Mokotów w Warszawie