New Zealand area, on North I, South I, Stewart I and Auckland Is, and several small offshore islands.
 
Population
Estimated population is 10,000 - 19,999 (2011) and decreasing.
Status NT
Deforestation, habitat modification and the introduction of mammalian predators, particularly cats, stoat Mustela erminea and rats, and possibly competition from Red-fronted Parakeet (Cyanoramphus novaezelandiae), are the main threats.
For more information see BirdLife International Species Factsheet.
Yellow-crowned Parakeet (Cyanoramphus auriceps) [XC464719]
by David Bradley from Abel Tasman National Park, Tasman District, Tasman, New Zealand (call, 'peer' call)
Yellow-crowned Parakeet (Cyanoramphus auriceps) [XC152298]
by Rob van Bemmelen from Waipapa Ecological Area, Pureora Forest, North Island, New Zealand (song)
Subspecies
Cyanoramphus auriceps (Sibley and Monroe 1990, 1993) has been split into Yellow-fronted Parakeet (Cyanoramphus auriceps), Chatham Parakeet (Cyanoramphus forbesi) and Malherbe's Parakeet (Cyanoramphus malherbi) following Boon et al. (2000).
Normally considered to include Chatham Parakeet (Cyanoramphus forbesi) and Malherbe's Parakeet (Cyanoramphus malherbi) as a subspecies and a variant respectively, but these forms perhaps better treated as separate species.
No subspecies.
Similar Species
Red-fronted Parakeet (Cyanoramphus novaezelandiae) has red crown and band from bill to behind eye.
References
See References.