Huhtala, K., Pulliainen, E., Jussila, P. and Tunkkari, P. S. (1996) “Food niche of Gyrfalcon Falco rusticolus nesting in the far north of Finland as compared with other choices of the species”, Ornis Fennica, 73(2), pp. 78–87. Available at: https://ornisfennica.journal.fi/article/view/133440 (Accessed: 25November2024).