• 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
-	-	A2c+3c+4c

Red List history

Year	Category	Criteria
2016	Vulnerable	A2c+3c+4c
2012	Vulnerable	A2c+3c+4c
2011	Vulnerable	A2c; A3c; A4c
2008	Vulnerable	A2c; A3c; A4c
2004	Vulnerable
2000	Vulnerable
1994	Lower Risk/Near Threatened
1988	Near Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	2,790,000 km2	medium
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	6000-15000 mature individuals	poor	estimated	2000
Population trend	decreasing	poor	suspected	2001-2011
Rate of change over the past 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Generation length	3.6 years	-	-	-
Number of subpopulations	2-100	-	-	-

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 (e.g. the lower end of such estimates is 1 / km²) and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied.  A much higher density of 6.7 individuals / km² was found in Itirapina Ecological Station, São Paulo, Brazil (Kanegae 2012).

Trend justification: This species's population size is suspected to be declining rapidly in line with rates of habitat loss within its range.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Argentina	extant	native		yes
Bolivia	extant	native		yes
Brazil	extant	native		yes
Paraguay	extant	native		yes

Country/Territory	IBA Name
Bolivia	Este de Río Mamoré
Bolivia	Loreto
Bolivia	Oeste de Río Mamoré
Bolivia	Reserva de Inmovilización Iténez
Brazil	Estação Ecológica de Águas Emendadas
Brazil	Parque Nacional da Chapada dos Veadeiros e Adjacências
Brazil	Parque Nacional das Emas
Paraguay	Arroyo Tagatiya
Paraguay	Cerrado de Laguna Blanca
Paraguay	Cerrados de Concepción
Paraguay	Estancia La Graciela
Paraguay	Estancia Sombrero
Paraguay	La Yegreña
Paraguay	Morombi
Paraguay	Parque Nacional San Rafael
Paraguay	Tapyta

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Grassland	Subtropical/Tropical Dry	major	breeding
Grassland	Subtropical/Tropical Dry	major	non-breeding
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
Altitude	0 - 1460 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		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		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 Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Hyparrhenia rufa	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation

---

Recommended citation
BirdLife International (2024) Species factsheet: Cock-tailed Tyrant Alectrurus tricolor. Downloaded from https://datazone.birdlife.org/species/factsheet/cock-tailed-tyrant-alectrurus-tricolor on 25/12/2024.
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 25/12/2024.