• 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., 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.
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	Vulnerable	C2a(i)
2016	Vulnerable	C2a(i)
2012	Vulnerable	C2a(i)
2008	Vulnerable	C2a(i)
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
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)	1,980,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	5250-23000 mature individuals	poor	estimated	2020
Population trend	decreasing	poor	inferred	2015-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	3.7 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: This species is poorly known. It appears to be very rare to rare and very local throughout its range. National population estimates include 250-2,499 mature individuals in Ecuador (Freile et al. 2019), 2,500-9,999 mature individuals each in Peru and Bolivia (Ministerio de Medio Ambiente y Agua 2009; SERFOR 2018), and an unknown, but likely very small, number in Argentina. Based on these numbers, the global population is estimated to number 5,250-23,000 mature individuals.
The species is suspected to form several small subpopulations, the largest of which is unlikely to contain more than 1,000 mature individuals, though this requires confirmation.

Trend justification: Trends have not been well documented, but the species appears to be declining for poorly understood reasons (B. Knapton in litt. 2003). It has been hypothesised that the species is suffering from habitat degradation and loss through the clearance of nesting habitat for sheep grazing and that it is hunted (Farnsworth et al. 2020). The species has reportedly declined in recent decades, being scarce in areas even in areas where it was formerly described as relatively numerous (e.g. Ridgely and Tudor 1994; Farnsworth et al. 2020). In Ecuador, there has been "an apparently precipitous drop in numbers" (Ridgely and Greenfield 2001). The situation in Peru is similar (Schulenberg et al. 2007). In view of the available evidence the species is inferred to undergo an continuing decline, the rate of which is tentatively placed in the band 1-9% over three generations (11.1 years).

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

Country/Territory	IBA Name
Argentina	Caspala y Santa Ana
Argentina	Cerro Negro de San Antonio
Argentina	Cuesta del Clavillo
Argentina	El Infiernillo
Argentina	Parque Nacional Campo de los Alisos
Argentina	Parque Nacional Los Cardones
Argentina	Parque Provincial Cumbres Calchaquíes
Argentina	Parque Provincial La Florida
Argentina	Parque Provincial Los Ñuñorcos y Reserva Natural Quebrada del Portugués
Argentina	Reserva Provincial de Uso Múltiple Laguna Leandro
Argentina	Sierra de Santa Victoria
Argentina	Sierra de Zenta
Peru	Cotahuasi
Peru	Parque Nacional Huascarán
Peru	Reserva Nacional Salinas y Aguada Blanca
Peru	Río Cajamarca

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	suitable	resident
Artificial/Terrestrial	Pastureland	suitable	resident
Artificial/Terrestrial	Urban Areas	suitable	resident
Grassland	Subtropical/Tropical High Altitude	major	resident
Shrubland	Subtropical/Tropical High Altitude	major	resident
Altitude	3500 - 4300 m	Occasional altitudinal limits	2400 - 5000 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species mortality
Biological resource use	Hunting & trapping terrestrial animals - Persecution/control	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Agriornis montanus	Timing		Scope		Severity		Impact
		Unknown		Majority (50-90%)		Unknown		Unknown
		Stresses Competition

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Recommended citation
BirdLife International (2024) Species factsheet: White-tailed Shrike-tyrant Agriornis albicauda. Downloaded from https://datazone.birdlife.org/species/factsheet/white-tailed-shrike-tyrant-agriornis-albicauda on 23/11/2024.
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 23/11/2024.