Sánchez, R., A. Margalida, L. Mariano González, and J. Oria. “Biases in Diet Sampling Methods in the Spanish Imperial Eagle Aquila Adalberti”. Ornis Fennica 85, no. 3 (September 30, 2008): 82–89. Accessed May 14, 2024. https://ornisfennica.journal.fi/article/view/133708.