Delta Amacuro Softtail Thripophaga amacurensis


Taxonomic note
Thripophaga amacurensis (del Hoyo and Collar 2016) is recognized as a species following work by Hilty et al. (2013).

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - B1ab(ii,iii)+2ab(ii,iii)

Red List history
Year Category Criteria
2022 Vulnerable B1ab(ii,iii)+2ab(ii,iii)
2016 Endangered B1ab(iii,v)
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,343
Extent of Occurrence breeding/resident (km2) 1,292
Number of locations 6-10 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-5 - - -
Decline (10 years/3 generation past and future) 1-5 - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -

Population justification: The population size of this species has not been quantified. The population is however suspected to be small given the very restricted range.
Due to its very small range, it is assumed that the species forms one subpopulation.

Trend justification: The species is threatened by the loss of its habitat; however its remote range is currently not under immediate threats and forest loss has been negligible over the past ten years (<1%; Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Nevertheless, small parts in the south-west of the range have been deforested for agricultural use (Lentino and Sharpe 2015; Global Forest Watch 2021), and as such the species is suspected to be undergoing a slow decline, the rate of which is unlikely to exceed 5% over ten years.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Venezuela N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Venezuela Reserva Forestal Imataca

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Swamp major resident
Altitude 0 - 100 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Causing/Could cause fluctuations Low Impact: 5
Ecosystem degradation, Ecosystem conversion
Energy production & mining Oil & gas drilling Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2023) Species factsheet: Thripophaga amacurensis. Downloaded from on 02/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 02/02/2023.