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LC
Western Corella Cacatua pastinator

Justification
Although this species may have a restricted range, it is not believed to approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be increasing, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
Christidis, L.; Boles, W. E. 1994. The taxonomy and species of birds of Australia and its territories. Royal Australasian Ornithologists' Union, Melbourne.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Distribution and population
This species is endemic to Australia. Subspecies pastinator is found in most of south-west Australia, south of Perth from the Swan and Avon rivers in the north, to Augusta in the west and Broome in the east. Subspecies derbyi is found in the northern wheatbelt of Western Australia.

Population justification
The global population size has not been quantified, but the population size for the nominate subspecies has been estimated as c.3,000 individuals (Garnett and Crowley 2000).

Trend justification
The population is suspected to be increasing as ongoing habitat degradation is creating new areas of suitable habitat.

Threats
Subspecies pastinator declined significantly in range and numbers early in the 20th century, as it was considered an agricultural pest. Extensive shooting and poisoning by farmers caused the population to plummet to c.100 birds in the 1940s. However, both the expansion of agriculture and prohibition of poisoning and shooting has allowed a recovery in numbers (Garnett and Crowley 2000). Clearance for agriculture has reduced the area of breeding habitat for subspecies derbyi, and may be favouring the Short-billed Corella C. sanguinea. Nevertheless, despite a low reproductive rate, the range of this subspecies has expanded in recent decades (Garnett 1992).

References
Garnett, S. 1992. Threatened and extinct birds of Australia. Royal Australasian Ornithologists' Union and Australian National Parks and Wildlife Service, Moonee Ponds, Australia.

Garnett, S. T.; Crowley, G. M. 2000. The action plan for Australian birds 2000. Environment Australia, Canberra.

Text account compilers
Butchart, S., Ekstrom, J., Harding, M.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2014) Species factsheet: Cacatua pastinator. Downloaded from http://www.birdlife.org on 20/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 20/04/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Psittacidae (Parrots)
Species name author (Gould, 1841)
Population size Unknown mature individuals
Population trend Increasing
Distribution size (breeding/resident) 115,000 km2
Country endemic? Yes
Links to further information
- Additional Information on this species