Attributes / relations provided by
♦ ¹Current Status and Conservation of the Scarlet Macaw (Ara macao) in the Osa Conservation Area (ACOSA), Costa Rica, Fiona Dear, Christopher Vaughan and Adrián Morales Polanco, Research Journal of the Costa Rican Distance Education University Vol. 2(1): 7-21, June, 2010
♦ 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.