LC
Western Olivaceous Flatbill Rhynchocyclus aequinoctialis



Taxonomy

Taxonomic note
Rhynchocyclus olivaceus and R. aequinoctialis (del Hoyo and Collar 2016) were previously lumped as R. olivaceus following AOU (1998 and supplements), SACC (2005 and updates), Sibley and Monroe (1990, 1993) and Stotz et al. (1996).

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
- - -

Red List history
Year Category Criteria
2021 Least Concern
2016 Least Concern
2012 Not Recognised
2008 Not Recognised
2004 Not Recognised
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

Migratory status not a migrant Forest dependency high
Land-mass type Average mass 21 g
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 5,800,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size unknown - - -
Population trend decreasing - suspected -
Generation length 2.3 years - - -

Population justification: The global population size has not been quantified given recent taxonomic splits. Prior to being split, the species has been described as 'uncommon and patchily distributed' (Stotz et al. 1996).

Trend justification: The species is undergoing a moderate decline (Partners in Flight 2019).


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Swamp suitable resident
Altitude 0 - 1000 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2024) Species factsheet: Western Olivaceous Flatbill Rhynchocyclus aequinoctialis. Downloaded from https://datazone.birdlife.org/species/factsheet/western-olivaceous-flatbill-rhynchocyclus-aequinoctialis on 23/12/2024.
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 23/12/2024.