Ornis Polonica 2019, 60: 1–15
The role of caches in the Eurasian Pygmy Owl Glaucidium passerinum during the breeding season
Romuald Mikusek
Ornis Polonica 2019, 60: 16–39
Numbers of ducks Anatinae during the breeding season at fish-ponds in Poland in 2016–2018
Michał Jantarski
Ornis Polonica 2019, 60: 40–46
Kleptoparasitism of the Jackdaw Corvus monedula and the Rook C. frugilegus during autumn and winter
Urszula Zaremba, Angelika Zbieć, Zbigniew Kasprzykowski
Ornis Polonica 2019, 60: 47–57
Abundance and distribution of the Mute Swan Cygnus olor in the Special Protection Area PLB200002 Augustów Forest
Grzegorz Zawadzki, Dorota Zawadzka, Anna Sołtys, Jerzy Zawadzki
Ornis Polonica 2019, 60: 58–65
The impact of plastic on birds
Zuzanna Jagiełło
Ornis Polonica 2019, 60: 66–71
Caspian Plover Charadrius asiaticus – a new bird species for Poland
Paweł Malczyk, Anna Kleszcz, Grzegorz Orłowski
Ornis Polonica 2019, 60: 71–74
Brood of the Common Kestrel Falco tinnunculus in the nest of the White Stork Ciconia ciconia
Marek Murawski, Krzysztof Antczak
