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

Taxonomic note

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. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2016	Near Threatened	A2c+3c+4c;C1+2a(i)
2012	Near Threatened	A2c+3c+4c;C1+2a(i)
2008	Near Threatened	A2c; A3c; A4c; C1; C2a(i)
2004	Near Threatened
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	237,000	medium
Number of locations	11-100	-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	10000-19999	poor	estimated	2007
Population trend	Decreasing	poor	suspected	-
Decline (3 years/1 generation past)		-	-	-
Decline (5 years/1 generation past)		-	-	-
Decline (10 years/1 generation past)		-	-	-
Decline (10 years/3 generation future)	10-19	-	-	-
Decline (10 years/3 generation past and future)	10-19	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage in largest subpopulation		-	-	-
Generation length (yrs)	5.1	-	-	-

Population justification: Based on the discovery of additional localities and an improved understanding of its range and status, the population is now estimated to exceed 10,000 individuals (Birdlife International 2007).

Trend justification: Although data on population trends are lacking, moderate declines are suspected to be on-going, owing to rates of habitat loss and degradation within the range.

Country/Territory	Occurrence status	Presence	Resident	Breeding	Non-breeding	Passage
Brazil	N	Extant	Yes

Country/Territory	IBA Name
Brazil	Parque Estadual do Desengano e Entorno
Brazil	Reserva Biológica União
Brazil	Serra dos Órgãos
Brazil	Reserva Biológica de Poço das Antas
Brazil	Serra do Tinguá
Brazil	Maciços da Tijuca e Pedra Branca
Brazil	Ilha Grande
Brazil	Serra do Marumbi
Brazil	Rio Guaraguaçu
Brazil	Área de Proteção Ambiental de Guaratuba
Brazil	Parque Estadual da Serra do Mar (entre Caraguatatuba e Picinguaba)
Brazil	Baía da Babitonga
Brazil	Salto do Piraí
Brazil	Parque Estadual da Serra do Mar (entre Santos e São Sebastião)
Brazil	Serra do Tabuleiro State Park
Brazil	Bertioga
Brazil	Parque Estadual da Serra do Mar (entre Pedro de Toledo e Cubatão)
Brazil	Itanhaém / Mongaguá
Brazil	Maciço Florestal de Paranapiacaba
Brazil	Guaraqueçaba / Jacupiranga / Cananéia
Brazil	Estação Ecológica de Juréia-Itatins
Brazil	Serra da Bocaina / Paraty / Angra dos Reis
Brazil	Região dos Aparados da Serra

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	major	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Savanna	Dry	suitable	resident
Altitude	0 - 500 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, 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
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Residential & commercial development	Tourism & recreation areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2021) Species factsheet: Myrmotherula unicolor. Downloaded from http://www.birdlife.org on 17/04/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/04/2021.