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

Taxonomic note

Horornis acanthizoides (del Hoyo and Collar 2016) was previously listed as Cettia acanthizoides.

Taxonomic source(s)
Alström, P.; Olsson, U.; Rasmussen, P. C.; Cheng-Te Yao; Ericson, P. G. P.; Sundberg, P. 2007. Morphological, vocal and genetic divergence in the Cettia acanthizoides complex. Zoological Journal of the Linnean Society 149: 437-452.
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
2013	Least Concern
2012	Least Concern
2010	Least Concern
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	altitudinal migrant	Forest dependency	low
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	2,060,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.04 years	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be fairly common (Baker 1997).

The population is suspected to be in decline owing to ongoing habitat destruction.

Trend justification: The population is suspected to be in decline owing to ongoing habitat destruction.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
China (mainland)	extant	native	yes
Hong Kong (China)	extant	vagrant
Taiwan, China	extant	native	yes

Country/Territory	IBA Name
Taiwan, China	Chuyanshan Nature Reserve
Taiwan, China	Dawushan Nature Reserve and Shuang-guei Lake Major Wildlife Habitat
Taiwan, China	Daxueshan, Xueshankeng, Wushikeng, Taichung City
Taiwan, China	Nengdan, Nantou County
Taiwan, China	North Section of Xueshan Mountain Range, Taoyuan City
Taiwan, China	Ruei-yan, Nantou County
Taiwan, China	Shei-Pa National Park
Taiwan, China	Taroko National Park
Taiwan, China	Yuli Wildlife Refuge
Taiwan, China	Yushan National Park

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	suitable	resident
Grassland	Temperate	major	resident
Shrubland	Temperate	major	resident
Altitude	80 - 3860 m	Occasional altitudinal limits

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Recommended citation
BirdLife International (2024) Species factsheet: Yellowish-bellied Bush-warbler Horornis acanthizoides. Downloaded from https://datazone.birdlife.org/species/factsheet/yellowish-bellied-bush-warbler-horornis-acanthizoides on 26/11/2024.
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 26/11/2024.