Sánchez-Alonso, C., X. Ruiz, G. Blanco, and I. Torre. “An Analysis of the Diet of Red-Billed Chough Pyrrhocorax Pyrrhocorax Nestlings in NE Spain, Using Neck Ligatures”. Ornis Fennica 73, no. 4 (December 31, 1996): 179–185. Accessed May 15, 2024. https://ornisfennica.journal.fi/article/view/133451.