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.
♦ ²Atkinson, I.A.E.; Merton, D.V. 2006. Habitat and diet of kakapo (Strigops habroptilis) in the Esperance Valley, Fiordland, New Zealand. Notornis 53(1): 37-54