• 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
A2ace+3ce+4ace; C2a(ii)	A2ace+3ce+4ace; C2a(i,ii); D	A2ace+3ce+4ace; C2a(i,ii); D1

Red List history

Year	Category	Criteria
2020	Critically Endangered	A2ace+3ce+4ace; C2a(ii)
2018	Critically Endangered	A2ace+4ace
2016	Critically Endangered	A2ace+3ce+4ace
2015	Critically Endangered	A2ace+3ce+4ace
2014	Critically Endangered	A2ace+3ce+4ace
2012	Endangered	B1ab(i,ii,iii,v)
2008	Endangered	B1a+b(i,ii,iii,v)
2004	Endangered
2000	Endangered
1996	Vulnerable
1994	Vulnerable
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	8,500 km2	medium
Area of Occupancy (breeding/resident)	6,220 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	210 mature individuals	good	estimated	2017
Population trend	decreasing	poor	estimated	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	80-99%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	80-99%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	80-99%	-	-	-
Generation length	2.1 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population is extremely small. Counts from 2010-2015 have produced estimates of between 405 and 592 individuals (Lazzoni Traversaro 2015, Yañez 2016), which roughly equates to 270-395 mature individuals. The most recent census in 2017 estimated only 316 individuals (Sepúlveda 2020, D. Lebbin in litt. 2020), equating to c. 210 mature individuals.

Trend justification: Evidence from surveys and anecdotal observations indicates that this species has undergone an extremely rapid decline. It was described as very common in the first half of the 20^th century, with over 100 individuals seen feeding together. In the late 1980s, the species was noted as common in gardens in Arica and regular in the Lluta Valley; however, it has since disappeared from these areas, and it is now rare in the Azapa Valley, where it was once regular and common (C. F. Estades in litt. 2007, A. Jaramillo in litt. 2014). In 2003, the Azapa valley held around 75% of the total population, which was estimated at around 1,500 individuals, while in 2007 the total population was estimated at around 1,200 individuals (55% in Azapa and 45% in Chaca) (C. F. Estades in litt. 2007). Counts from 2010-2015, however, suggests that the population has since declined to around 500 individuals (D. Lebbin in litt. 2012, Lazzoni Traversaro 2015, Yañez 2016). Population estimates have shown that the Azapa and Chaca populations have reduced by 15.6% annually (81.6%) in 10 years (C. F. Estades in litt. 2013). Population counts from between 2003 and 2015 (Lazzoni Traversaro 2015, Yañez 2016) and from 2017 (Sepúlveda 2020) indicate that the population is likely declining at a rate of >80% over three generations. It has been speculated that the species could be lost from the Azapa Valley within a decade, and that the species could face extinction within two decades (A. Jaramillo in litt. 2014). Therefore, it is assumed that declines are continuing at the same rate into the future.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Chile	extant	native	yes
Peru	possibly extinct	native	yes

Country/Territory	IBA Name
Chile	Valle Azapa
Chile	Valle de Chaca
Peru	Tacna

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	major	resident
Artificial/Terrestrial	Rural Gardens	suitable	resident
Desert	Hot	major	resident
Shrubland	Subtropical/Tropical Dry	suitable	resident
Altitude	200 - 700 m	Occasional altitudinal limits	(max) 3000 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Thaumastura cora	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Hybridisation, Competition
Pollution	Agricultural & forestry effluents - Herbicides and pesticides	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Indirect ecosystem effects, Ecosystem degradation

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Chilean Woodstar Eulidia yarrellii. Downloaded from https://datazone.birdlife.org/species/factsheet/chilean-woodstar-eulidia-yarrellii on 26/12/2024.
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 26/12/2024.