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

Taxonomic note

Orthotomus chaktomuk (del Hoyo and Collar 2016) is recognised as a species following work by Mahood et al. (2013).

Taxonomic source(s)
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
2023	Near Threatened	B1ab(ii,iii,iv,v)
2016	Near Threatened	A2c+3c+4c
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	15,500 km2
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	inferred	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	5-20%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	5-20%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	5-20%	-	-	-
Generation length	2.37 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: No population estimate has been made, but it is often the commonest species within the rather specialised habitat in which it occurs (Mahood et al. 2013, Goes 2014, eBird 2022).

Trend justification: Suitable habitat for this species is decreasing in extent (Google Earth 2022, S. Mahood in litt. 2022) and this is inferred to be causing ongoing population declines, as the species has been lost from some sites (Mahood et al. 2013). The rate of these declines is difficult to quantify, although based on approximations using remote sensing data, is suspected at a rate of 5-20% over the past ten years. This should be closely monitored in the future, with development plans for this region, if enacted, potentially having significant consequences on the extent and suitability of habitat (see, e.g., Horton et al. 2022).

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Shrubland	Subtropical/Tropical Moist	major	resident
Altitude	0 - 100 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Marine & freshwater aquaculture - Subsistence/artisinal aquaculture	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Renewable energy	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Residential & commercial development	Commercial & industrial areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Cambodian Tailorbird Orthotomus chaktomuk. Downloaded from https://datazone.birdlife.org/species/factsheet/cambodian-tailorbird-orthotomus-chaktomuk on 27/11/2024.
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 27/11/2024.