Reduced food availability induces behavioural changes in Griffon vulture
Zuberogoitia, I., Martínez, J.E., Margalida, A., Gómez, I., Azkona, A. & Martínez, J. A. 2010. Reduced food availability induces behavioural changes in Griffon vulture. Ornis fenica 87:52-60.