Attributes / relations provided by
♦ 1Diet of the Scaly-headed Parrot (Pionus maximiliani) in a Semideciduous Forest in Southeastern Brazil, Mauro Galetti, BIOTROPICA 25(4): 419-425 1993
♦ 2del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.