• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
Christidis, L. and 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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	2,410,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	poor	estimated	2009
Population trend	decreasing	-	suspected	-
Generation length	2.67 years	-	-	-

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). 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).

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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Australia	extant	native	yes

Country/Territory	IBA Name

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	0 - 500 m	Occasional altitudinal limits

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Slender-billed Thornbill Acanthiza iredalei. Downloaded from https://datazone.birdlife.org/species/factsheet/slender-billed-thornbill-acanthiza-iredalei on 22/12/2024.
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 22/12/2024.