LC
Tooth-billed Wren Odontorchilus cinereus



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: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2022 Least Concern
2016 Near Threatened A3c
2012 Near Threatened A3c
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 1,170,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected 2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods) 10-19% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 10-19% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 10-19% - - -
Generation length 2.44 years - - -

Population justification: The global population size has not been quantified. The species is described as 'uncommon'; it occurs at low densities (Stotz et al. 1996, A. Lees in litt. 2022).

Trend justification: Due to its dependence on tall, undisturbed humid forests (Schulenberg 2020), the species is suspected to undergo a decline as habitat is lost and degraded.
The population trend has not been quantified directly. Within the range, tree cover is lost at a rate of 7% over ten years, having accelerated to approximately 9.5% loss since 2016 (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). Given its strict habitat requirements, and additional impacts from fires and selective logging (Barlow et al. 2016, A. Lees in litt. 2022), the rate of population decline is suspected to be higher than the rate of tree cover loss alone, and is therefore here placed in the band 10-19% over ten years.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Bolivia Noel Kempff Mercado
Brazil Cristalino / Serra do Cachimbo
Brazil Ji-Paraná / Roosevelt
Brazil Serra dos Carajás

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
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%) Slow, Significant Declines Medium Impact: 6
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
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2024) Species factsheet: Tooth-billed Wren Odontorchilus cinereus. Downloaded from https://datazone.birdlife.org/species/factsheet/tooth-billed-wren-odontorchilus-cinereus 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.