Productivity of the Great Egret (Ardea alba) and Grey Heron (A. cinerea) in mixed heronries in Poland and behavioral response of fledglings to a drone. Ornis Fenn [Internet]. 2024 Feb. 20 [cited 2025 Nov. 10];100(4):144-58. Available from: https://ornisfennica.journal.fi/article/view/119429