2011. Diet composition of the Caspian Gull (Larus cachinanns) in inland Poland: effects of breeding area, breeding stage and sympatric breeding with the Herring Gull (Larus argentatus) . Ornis Fennica. 88, 2 (Jul. 2011), 80–89. DOI:https://doi.org/10.51812/of.133765.