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

Taxonomic note
Aglaiocercus kingii (del Hoyo and Collar 2014) was previously listed as A. kingi.

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
2006	Least Concern
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)	3,700,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.27 years	-	-	-

Population justification: The global population size has not been quantified, but this species is described as 'fairly common' (Stotz et al. 1996). This species is suspected to be declining locally owing to ongoing habitat loss and habitat degradation caused by widespread gold mining in the past (del Hoyo et al. 1999).

Trend justification: This species is suspected to be declining locally owing to ongoing habitat loss and habitat degradation caused by widespread gold mining in the past (del Hoyo et al. 1999).

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Grassland	Subtropical/Tropical Dry	suitable	resident
Grassland	Subtropical/Tropical High Altitude	marginal	resident
Shrubland	Subtropical/Tropical High Altitude	major	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	1200 - 3000 m	Occasional altitudinal limits	(max) 3000 m

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Long-tailed Sylph Aglaiocercus kingii. Downloaded from https://datazone.birdlife.org/species/factsheet/long-tailed-sylph-aglaiocercus-kingii on 18/12/2024.
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 18/12/2024.