• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic note

Gymnopithys leucaspis and G. bicolor (del Hoyo and Collar 2016) were previously listed as G. leucaspis following AOU (1998 & supplements), SACC (2005 & updates) 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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	high
Land-mass type		Average mass	24 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,650,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	500000-4999999 mature individuals	poor	suspected	2022
Population trend	decreasing	-	inferred	2017-2027
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	3.07 years	-	-	-

Population justification: The global population is suspected to number 500,000-4,999,999 mature individuals (Partners in Flight 2022). The species is described as 'fairly common' (Stotz et al. 1996).

Trend justification: The species is undergoing a significant decline, which is likely driven by habitat loss (del Hoyo et al. 2020, Partners in Flight 2022). In particular, populations in Central America are suffering from the loss and fragmentation of forests, with subsequent local extinctions (del Hoyo et al. 2020, Pollock et al. 2022).
Tree cover within the range is lost at a rate of 7-9% over ten years (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). Due to the species' strict dependence on undisturbed forests (del Hoyo et al. 2020), population declines may be steeper than the rate of habitat loss alone. They are here tentatively placed in the band 10-19% over three generations.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Colombia	extant	native	yes
Costa Rica	extant	native	yes
Ecuador	extant	native	yes
Honduras	extant	native	yes
Nicaragua	extant	native	yes
Panama	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Altitude	0 - 900 m	Occasional altitudinal limits	(max) 1890 m

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 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 conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Bicolored Antbird Gymnopithys bicolor. Downloaded from https://datazone.birdlife.org/species/factsheet/bicolored-antbird-gymnopithys-bicolor on 26/11/2024.
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 26/11/2024.