• 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
-	-	C2a(i)

Red List history

Year	Category	Criteria
2021	Near Threatened	C2a(i)
2016	Vulnerable	C2a(i)
2012	Vulnerable	C2a(i)
2008	Vulnerable	C2a(i)
2004	Vulnerable
2000	Vulnerable
1996	Endangered
1994	Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	334,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	5000-19999 mature individuals	poor	suspected	2021
Population trend	decreasing	poor	inferred	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Generation length	2.6 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The total population size has not been quantified, but the species is described as uncommon (Züchner et al. 2020). In Ecuador, it is no longer known to be present in large numbers anywhere in the country (Gurney 2006; Athanas and Greenfield 2016). The population in Ecuador is suspected to number 2,500-9,999 mature individuals (Freile et al. 2019). There are an increasing number of recent reports from northern Peru, but it is rare in the centre of the country (T. Marks in litt. 2003; Angulo et al. 2012; F. Angulo in litt. 2020). The size of the population in Peru is unknown (see SERFOR 2018); based on observational records (eBird 2021) it may be of a similar size as the population in Ecuador. The population in Colombia is likely extremely small (see eBird 2021). Consequently, the global population is suspected to number 5,000-19,999 mature individuals.
The population structure has not been investigated, but the species may form several small subpopulations, at least in parts of its range in Ecuador (see Freile et al. 2019).

Trend justification: The species was once considered common, but has reportedly declined in line with the destruction and fragmentation of forested habitat within its range, so that it is now considered uncommon in parts of its range (Fjeldså and Krabbe 1990; Züchner et al. 2020). Within the range, 3% of tree cover has been lost over the past ten years (Global Forest Watch 2021). The species is strictly dependent on forests (Züchner et al. 2020), and thus the population decline may be exacerbated by additional habitat degradation. It is however unlikely that population declines exceed 20% over ten years.

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

Country/Territory	IBA Name
Colombia	Reserva Natural El Pangán
Colombia	Reserva Natural Río Ñambí
Ecuador	Abras de Mantequilla
Ecuador	Cañón del río Catamayo
Ecuador	Parque Nacional Machalilla y alrededores
Ecuador	Reserva Ecológica Comunal Loma Alta
Peru	Alto Valle del Saña
Peru	Carpish
Peru	El Molino
Peru	Parque Nacional Cerros de Amotape

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	0 - 3050 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
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Little Woodstar Chaetocercus bombus. Downloaded from https://datazone.birdlife.org/species/factsheet/little-woodstar-chaetocercus-bombus on 22/12/2024.
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 22/12/2024.