Current view: Data table and detailed info
Taxonomic note
Since 1930 commonly treated as a subspecies of C. auriceps, and clearly the two are closely related; present species differs, however, in its considerably larger size, with mean male wing 128.2 (n=6) vs 109.9 (n=10) (Forshaw 1989) (at least 2), its lack of red line between frons and eye (2), outer webs of flight-feathers greenish-blue vs violet-blue (2), and more yellowish underparts (1). Has hybridized extensively with C. novaezelandiae chathamensis, to the extent that it was almost eradicated by genetic swamping (Chan Chi-hang et al. 2005, Chan Chi-hang et al. 2006, Triggs and Daugherty 1996). Monotypic.
Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
IUCN Red List criteria met and history
Red List criteria met
Red List history
Migratory status |
not a migrant |
Forest dependency |
high |
Land-mass type |
|
Average mass |
- |
Population justification: The population of forbesi-like phenotypes has increased dramatically on Mangere Island in the past as a result of habitat management and exotic predator control. The Little Mangere Island population is poorly known due to few visits taking place (H. Aikman in litt. 1999). In 1999, the total population was estimated to be about 120 birds (Aikman et al. 2001), but surveys in 2003 estimated 900 individuals on Mangere Island (Aikman and Miskelly 2004, D. Houston and C. Miskelly in litt. 2008) following culling of Cyanoramphus novaezelandiae. Since then it has likely decreased to 600-700 mature individuals with rapid regeneration and planting of vegetation (T. Greene in litt. 2020). A survey in 2011 assessed the phenotypes of concern to be at 10%, the trigger level for management action (D. Houston in litt. 2012) but number of hybrids appear to have stabilised or declined since (T. Greene in litt. 2020). The population has exceeded 250 mature individuals for well over 5 years and is currently thought to be stable (Robertson et al. 2021), so it is placed in the range of 250-999 mature individuals.
Trend justification: Habitat management and predator control has caused the species to dramatically increase in the past, and it is now considered to be stable. The population has shown minor fluctuations due to both habitat restoration and hybridisation as the species recolonised Mangere Island by the 1970s. Overall, the population is estimated to have been stable over the last three generations (Robertson et al. 2013, 2017, 2021).
Country/territory distribution
Important Bird and Biodiversity Areas (IBA)
Recommended citation
BirdLife International (2024) Species factsheet: Chatham Islands Parakeet Cyanoramphus forbesi. Downloaded from
https://datazone.birdlife.org/species/factsheet/chatham-islands-parakeet-cyanoramphus-forbesi on 23/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 23/12/2024.