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

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
2022	Near Threatened	B1b(ii,iii)+2b(ii,iii)
2016	Endangered	B1ab(i,ii,iii,v)
2013	Endangered	B1ab(i,ii,iii,v)
2012	Endangered	B1ab(i,ii,iii,v)
2008	Endangered	B1a+b(i,ii,iii,v)
2004	Endangered
2000	Endangered
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	3,150 km2	medium
Area of Occupancy (breeding/resident)	2,284 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	8200-14000 mature individuals	good	estimated	2015
Population trend	stable	poor	suspected	1998-2008
Generation length	3.72 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Based on density estimates from Piedras Blancas National Park extrapolated over the area of suitable habitat in the entire range, the global population is estimated at 12,432-20,720 individuals (Cornils et al. 2015). Assuming that 2/3 of these are mature, this roughly equates to 8,200-14,000 mature individuals. 
The subpopulation structure has not formally been investigated, but based on observational records within the very small range (per eBird 2021) it is assumed that all individuals belong to the same subpopulation.

Trend justification: The population has likely declined in the past due to the loss, fragmentation and degradation of forests. However, the vast majority of the population occurs within protected areas, where habitat is not at risk (Cornils et al. 2015, Pott et al. 2020). Throughout the range tree cover loss is very low (<2% over three generations; Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). The population is therefore assessed as stable.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Costa Rica	extant	native	yes

Country/Territory	IBA Name
Costa Rica	Sierpe Wetlands and Osa Peninsula

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 300 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Black-cheeked Ant-tanager Habia atrimaxillaris. Downloaded from https://datazone.birdlife.org/species/factsheet/black-cheeked-ant-tanager-habia-atrimaxillaris 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.