Attributes / relations provided by
♦ 1Higgins, PJ (Ed) (1999) Handbook of Australian, New Zealand and Antarctic birds. Volume 4: Parrots to dollarbird. Oxford University Press, Melbourne
♦ 2Hamish Wilman, Jonathan Belmaker, Jennifer Simpson, Carolina de la Rosa, Marcelo M. Rivadeneira, and Walter Jetz. 2014.
EltonTraits 1.0: Species-level foraging attributes of the world's birds and mammals. Ecology 95:2027
♦ 3Comparative ecology of sympatric orange-fronted parakeets (Cyanoramphus malherbi) and yellow-crowned parakeets (C. auriceps), South Island, New Zealand, Jonathan C. Kearvell, James R. Young and Andrew D. Grant, New Zealand Journal of Ecology (2002) 26(2): 139-148