Bustnes, Jan Ove, Morten Helberg, and Bård-Jørgen Bårdsen. “Reproductive Success of Threatened Northern Lesser Black-Backed Gulls (Larus Fuscus Fuscus) in Relation to Nest Predation by Ravens (Corvus Corax)”. Ornis Fennica 99, no. 1 (June 26, 2022): 1–14. Accessed August 16, 2022. https://ornisfennica.journal.fi/article/view/115081.