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.
♦ ²Conservation status and limiting factors in the endangered population of Egyptian vulture (Neophron percnopterus) in the Canary Islands, José A. Donázar, César J. Palacios, Laura Gangoso, Olga Ceballos, María J. González and Fernando Hiraldo, Biological Conservation 107 (2002) 89–97