Western Olivaceous Flatbill (Rhynchocyclus aequinoctialis)

Western Olivaceous Flatbill Rhynchocyclus aequinoctialis

Current view: Data table and detailed info

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
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 22/11/2024.
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 22/11/2024.