Anna Włodarczak-Komosińska, Krzysztof Jankowski, Sebastian Menderski
Ornis Polonica 2025, 66: 327-333
https://doi.org/10.12657/ornis.2025.4.5
Summary: Nesting of various gull species on urban infrastructure is becoming increasingly common in both Europe and Poland. However, Black-headed Gulls Chroicocephalus ridibundus and Common Terns Sterna hirundo are reluctant to breed in the such habitats. This note describes the first breeding colony of these species in Poland. Between 2022 and 2025, 147 to 1,125 pairs of Black-headed Gulls and 20 to 32 pairs of Common Terns nested on the roof of the Michelin factory in Olsztyn. Additionally, Common Gulls Larus canus, Mediterranean Gulls Ichthyaetus melanocephalus, and Caspian Gulls L. cachinans were found nesting in the colony.
