Zbyryt, A., Mitrus, C. and Neubauer, G. 2024. 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 Fennica. 100, 4 (Feb. 2024), 144–158. DOI:https://doi.org/10.51812/of.119429.