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Strange-tailed Tyrant Alectrurus risora

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable A2c+3c+4c 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 98,900 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 6000-15000 poor Estimated 2000
Population trend Decreasing poor -
Number of subpopulations 2-100 - - -
Largest subpopulation 1001-10000 - - -
Generation length (yrs) 3.6 - - -
Population justification: The population is estimated to number 10,000-19,999 individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size (the lower limit of such estimates for tyrannids is one individual/km2), and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate equates to 6,667-13,333 mature individuals, rounded to 6,000-15,000 mature individuals here.
Trend justification: This species's population is suspected to be declining rapidly, in line with rates of habitat loss within its range.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage
Argentina Native Extant Yes    
Brazil Native Extant Yes    
Paraguay Native Extant Yes    
Uruguay Native Extant Yes    

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Argentina Concepción-Chavarría site factsheet
Argentina Cuenca del río Aguapey site factsheet
Argentina El Cachapé site factsheet
Argentina Estancia Guaycolec site factsheet
Argentina Estancia Mora Cué y alrededores site factsheet
Argentina Estancia Puerto Valle site factsheet
Argentina Estancia San Juan Poriahú site factsheet
Argentina Estero Tapenagá site factsheet
Argentina Galarza site factsheet
Argentina Lomada de San Alonso site factsheet
Argentina Parque Nacional Mburucuyá site factsheet
Argentina Reserva El Bagual site factsheet
Argentina Reserva Natural Rincón de Santa María site factsheet
Argentina Riacho He He site factsheet
Argentina Rincón del Socorro-Iberá site factsheet
Argentina Valle Fluvial del Río Paraguay site factsheet
Paraguay Arroyos y Esteros site factsheet
Paraguay Campo Llano site factsheet
Paraguay Estancia La Graciela site factsheet
Paraguay Estancia La Rafaela site factsheet
Paraguay Estancia Redondo site factsheet
Paraguay Estancia Sombrero site factsheet
Paraguay Estancias Golondrina - El Trébol site factsheet
Paraguay Estero Ñu Guazú - General Artigas site factsheet
Paraguay Lago Ypoa site factsheet
Paraguay Parque Nacional San Rafael site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subtropical/Tropical Seasonally Wet/Flooded major breeding
Grassland Subtropical/Tropical Seasonally Wet/Flooded major non-breeding
Savanna Dry major breeding
Savanna Dry major non-breeding
Shrubland Subtropical/Tropical Moist suitable breeding
Shrubland Subtropical/Tropical Moist suitable non-breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major breeding
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands major non-breeding
Altitude 0 - 500 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact:
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching / Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact:
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Wood & pulp plantations / Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact:
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression / Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact:
Stresses
Ecosystem degradation
Pollution Agricultural & forestry effluents / Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2014) Species factsheet: Alectrurus risora. Downloaded from http://www.birdlife.org on 18/04/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/04/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Tyrannidae (Tyrant-flycatchers)
Species name author (Vieillot, 1824)
Population size 6000-15000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 98,900 km2
Country endemic? No
Links to further information
- Summary information on this species