Northern Bentbill (Oncostoma cinereigulare) | Details

Northern Bentbill Oncostoma cinereigulare

Current view: Data table and detailed info

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
2021	Least Concern
2016	Least Concern
2012	Least Concern
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	medium
Land-mass type		Average mass	6 g

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,180,000 km²	medium
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	500000-4999999 mature individuals	poor	suspected	2019
Population trend	decreasing	-	inferred	2015-2025
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	2.95 years	-	-	-

Population justification: The global population is suspected to number 500,000-4,999,999 mature individuals (Partners in Flight 2019).

Trend justification:

The species is undergoing a moderate decline (Partners in Flight 2019). A remote-sensing study found that forest within its range has been lost at a rate of 6% over three generations (Tracewski et al. 2016). Assuming that forest loss is continuing at the same rate and population declines are proportional to forest loss, the species may be declining at <10% over three generations.

Country/territory distribution

Country/Territory	Presence	Origin	Resident
Belize	extant	native	yes
Costa Rica	extant	native	yes
El Salvador	extant	native	yes
Guatemala	extant	native	yes
Honduras	extant	native	yes
Mexico	extant	native	yes
Nicaragua	extant	native	yes
Panama	extant	native	yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Dry	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	0 - 1450 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Northern Bentbill Oncostoma cinereigulare. Downloaded from https://datazone.birdlife.org/species/factsheet/northern-bentbill-oncostoma-cinereigulare on 18/12/2024.
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 18/12/2024.