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.
♦ 2Geographical ecology and variation of plant-seed disperser interactions: southern Spanish junipers and frugivorous thrushes, Pedro Jordano, Vegetatio 107/108: 85-104, 1993.