Sánchez-Alonso, C., Ruiz, X., Blanco, G. and Torre, I. (1996) “An analysis of the diet of Red-billed Chough Pyrrhocorax pyrrhocorax nestlings in NE Spain, using neck ligatures”, Ornis Fennica, 73(4), pp. 179–185. Available at: https://ornisfennica.journal.fi/article/view/133451 (Accessed: 22November2024).