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.
♦ ²Breeding patterns and habitat use in the endemic Curl-crested Jay of central Brazil, Marina F. Amaral and Regina H. F. Macedo, J. Field Ornithol. 74(4):331–340, 2003