Ornis Fennica 2021:4

Ornis Fennica 4/2021 contains the following articles: Martin Beal, Patrik Byholm, Ulrik Lötberg, Tom J. Evans, Kozue Shiomi & Susanne Åkesson, Habitat selection and foraging site fidelity in Caspian Terns (Hydroprogne caspia) breeding in the Baltic Sea; Tobias Ludwig, Ralf Siano & Alexander V. Andreev, Habitat selection of sympatric Siberian Grouse and Hazel Grouse in natural and exploited forests of the lower Amur region; László Bozó, Yury Anisimov & Tibor Csörgő: Association of weather variables with the migration phenology and body conditions of Siberian warblers.