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.
♦ ²A STUDY OF AVIAN FRUGIVORES, BIRD-DISPERSED PLANTS, AND THElR INTERACTION IN MEDITERRANEAN SCRUBLANDS, CARLOS M. HERRERA, Ecological Monographs, 54(1), 1984, pp. 1-23