• 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
-	B1ab(iii,v)+2ab(iii,v)	B1ab(iii,v)+2ab(iii,v); C2a(i)

Red List history

Year	Category	Criteria
2022	Endangered	B1ab(iii,v)+2ab(iii,v)
2016	Endangered	B1ab(i,ii,iii,v)+2ab(i,ii,iii,v)
2012	Endangered	B1ab(iii,v)+2ab(iii,v)
2008	Vulnerable	D2
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type	Australia	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	707 km2	medium
Area of Occupancy (breeding/resident)	290 km2
Number of locations	5	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1100-1600, 1380 mature individuals	good	estimated	2020
Population trend	stable	good	inferred	1998-2008
Generation length	4.35 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: Noisy Scrub-bird numbers are currently about 1,380 mature individuals (Burbidge et al. 2018, Comer et al. 2020) based on a ratio of 2.5 individuals for each territorial male (Danks et al. 1996).

Trend justification: The population increased exponentially from about 1983 to 2001 but fires in that year, 2004 and 2015 severely reduced the population on each occasion: on the mainland, there were 569 singing males in 1999, 733 in 2001, 278 in 2005, 379 in 2011, about 520 in 2015 and 415 in 2019 (estimated 1037 mature individuals) (Comer 2002; Comer et al. 2005, 2020; Danks and Comer 2006; Burbidge et al. 2018). In 2019, there were 137 singing males on Bald Island (estimated 342 mature individuals) (Comer et al. 2020). Reasons for a 75% population decline on Mt Gardner since 1994 are not well understood, but the pattern is not correlated with territory size, marginal declines in rainfall or fire impacts (Roberts et al. 2020). Most of this decline has been in the last decade – 70% since 2011 (Comer et al. 2020). Overall, there has been a 28% decline since 2001 but in the last three generations monitoring indicates a change in trajectory with the population increasing by about 10%. There is a high probability, however, that fire will cause population declines in the next three generations based on the increasing frequency of droughts and heat waves in the region (Comer et al. 2021).

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

Country/Territory	IBA Name
Australia	Two Peoples Bay and Mount Manypeaks

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	major	resident
Rocky areas (eg. inland cliffs, mountain peaks)		suitable	resident
Shrubland	Temperate	major	resident
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	suitable	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	0 - 500 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Natural system modifications	Dams & water management/use - Abstraction of surface water (agricultural use)	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Noisy Scrub-bird Atrichornis clamosus. Downloaded from https://datazone.birdlife.org/species/factsheet/noisy-scrub-bird-atrichornis-clamosus on 21/12/2024.
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 21/12/2024.