KASPRZYK, Krzysztof Andrzej and FRĄTCZAK , Waldemar. Diet of solitary males Boreal Owls Aegolius funereus in the lowlands of the Bydgoszcz Forest (northern Poland). Ecological Questions. Online. 30 July 2025. Vol. 36, no. 2, pp. 1-15. [Accessed 12 November 2025]. DOI 10.12775/EQ.2025.016.