• 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
-	-	-

Red List history

Year	Category	Criteria
2023	Near Threatened	C1+2a(ii)
2016	Near Threatened	D2
2012	Near Threatened	D2
2008	Near Threatened	D2
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Threatened

Migratory status	not a migrant	Forest dependency	high
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	36,300 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	8000 mature individuals	poor	inferred	2022
Population trend	decreasing	poor	suspected	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Generation length	3.08 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The global population size has not been quantified, but this species is described as fairly common, though apparently occurring at a low density (Zimmer and Isler 2020).
Assuming that the species occurs at a similar density to a congener in the Peruvian Amazon (T. aethiops: 2 mature individuals/km²; Santini et al. 2018), and that 20% of forests within the range are occupied to account for its low density (i.e., 4,000 km²; Global Forest Watch 2022), the global population may number 8,000 mature individuals.

Trend justification: There are no data on the population trend, but declines are suspected on the basis of the species' specific habitat requirements and ongoing deforestation within the range. Even though vast tracts of undisturbed, pristine habitat remain, logging activities particularly in the western part of the range in proximity to human settlements are extensive (Global Forest Watch 2022).
Over ten years, 6% of tree cover is lost within the known range (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). The species shows a preference for dense riparian forests, which are mostly easily accessible and consequently at a disproportionate risk of loss and degradation. Population declines may therefore exceed the rate of tree cover loss; they are here tentatively placed in the band 1-19% over ten years.

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

Country/Territory	IBA Name
Ecuador	Bajo Napo
Ecuador	Reserva de Producción Faunística Cuyabeno

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Swamp	major	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	160 - 250 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Oil & gas drilling	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Cocha Antshrike Thamnophilus praecox. Downloaded from https://datazone.birdlife.org/species/factsheet/cocha-antshrike-thamnophilus-praecox 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.