Attributes / relations provided by
♦ 1del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ 2Assessing the diet of nestling Bearded Vultures: a comparison between direct observation methods, Antoni Margalida, Joan Bertran, and Jennifer Boudet, J. Field Ornithol. 76(1):4045, 2005