LC
Slender-billed Thornbill Acanthiza iredalei



Taxonomy

Taxonomic note

Taxonomic source(s)
Christidis, L. and Boles, W.E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
Christidis, L.; Boles, W. E. 2008. Systematics and taxonomy of Australian birds. CSIRO Publishing, Collingwood, Australia.
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1996 Vulnerable
1994 Vulnerable
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type Land-mass type - Australia
Average mass 6 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,410,000
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals poor estimated 2009
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 5.7 - - -

Population justification: Garnett and Crowley (2000) estimated the population size as follows: approximately 100,000 individuals of subspecies liredalei, approximately 10,000 individuals of subspecies rosinae and approximately 24,000 individuals of subspecies hedleyi, giving an overall total of 134,000 individuals. (Garnett and Crowley 2000).

Trend justification: This population is suspected to be in decline owing to ongoing habitat destruction caused by over-grazing by introduced rabbits and sheep (Garnett and Crowley. 2000).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Australia N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Shrubland Mediterranean-type Shrubby Vegetation major resident
Shrubland Subtropical/Tropical Dry major resident
Altitude   Occasional altitudinal limits  

Recommended citation
BirdLife International (2022) Species factsheet: Acanthiza iredalei. Downloaded from http://www.birdlife.org on 07/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 07/10/2022.