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

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

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
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	41,200 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.43 years	-	-	-

Population justification: The global population size has not been quantified, but this species is described as 'uncommon' (Stotz et al. 1996). The population is suspected to be in decline owing to changing agricultural practices, increased use of fire and a shift from farming camelids to farming sheep, all of which have led to the degradation and destruction of polylepis woodlands (del Hoyo et al. 2001).

Trend justification: The population is suspected to be in decline owing to changing agricultural practices, increased use of fire and a shift from farming camelids to farming sheep, all of which have led to the degradation and destruction of polylepis woodlands (del Hoyo et al. 2001).

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

Country/Territory	IBA Name
Colombia	Parque Nacional Natural Chingaza and surroundings
Venezuela	Parque Nacional El Tamá

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Grassland	Subtropical/Tropical High Altitude	major	resident
Shrubland	Subtropical/Tropical High Altitude	suitable	resident
Altitude	3000 - 3900 m	Occasional altitudinal limits	(min) 2900 m

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Bronze-tailed Thornbill Chalcostigma heteropogon. Downloaded from https://datazone.birdlife.org/species/factsheet/bronze-tailed-thornbill-chalcostigma-heteropogon on 22/11/2024.
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 22/11/2024.