VU
White-tailed Shrike-tyrant Agriornis albicauda



Taxonomy

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: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
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
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,980,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 5250-23000 poor estimated 2020
Population trend Decreasing poor inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-9 - - -
Decline (10 years/3 generation past and future) 1-9 - - -
Number of subpopulations 2-100 - - -
Percentage in largest subpopulation 1-89 - - -
Generation length (yrs) 3.7 - - -

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 distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Argentina N Extant Yes
Bolivia N Extant Yes
Chile N Extant Yes
Ecuador N Extant Yes
Peru N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Ecuador Parque Nacional Podocarpus
Peru Carpish
Peru Marcapomacocha
Peru Parque Nacional Huascarán
Peru Reserva Nacional Salinas y Aguada Blanca
Argentina Parque Nacional Los Cardones
Argentina Sierra de Santa Victoria
Argentina El Infiernillo
Argentina Sierra de Zenta
Argentina Reserva Provincial de Uso Múltiple Laguna Leandro
Argentina Parque Nacional Campo de los Alisos
Argentina Parque Provincial Cumbres Calchaquíes
Argentina Cuesta del Clavillo
Argentina Parque Provincial La Florida
Argentina Parque Provincial Los Ñuñorcos y Reserva Natural Quebrada del Portugués
Argentina Caspala y Santa Ana
Argentina Cerro Negro de San Antonio
Peru Cotahuasi
Peru Río Cajamarca
Chile Monumento Natural Salar de Surire

Habitats & altitude
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

Threats & impact
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

Recommended citation
BirdLife International (2022) Species factsheet: Agriornis albicauda. Downloaded from http://www.birdlife.org on 01/10/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/10/2022.