• 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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Near Threatened	A2c+3c+4c
2012	Near Threatened	A2c+3c+4c
2008	Near Threatened	A2c; A3c; A4c
2004	Near Threatened
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	5,760,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	poor	suspected	-
Generation length	2.34 years	-	-	-
Number of subpopulations	5-20	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The global population size has not been quantified, but this species is generally described as rare and patchily distributed (Stotz et al. 1996, Fitzpatrick and Kirwan 2023). It however appears to be common locally, including in Sipaliwini (Suriname) and in Bolivia, where substantial populations remain (O. Ottema in litt. 2020, Fitzpatrick and Kirwan 2023). Density estimates range from 2.2 individuals/km² to more than 20 individuals/km² (Fitzpatrick and Kirwan 2023, Marini et al. 2023). Given its overall rarity, localised distribution and strict habitat requirements, an extrapolation of the population based on these estimates is not feasible (Marini et al. 2023). Nevertheless, the global population is likely large.
The species is restricted to specific habitat within the Cerrado biome, open humid grassy habitats, which are easily converted to agriculture (A. Lees in litt. 2024, E.R. Luiz in litt. 2024). Due to the loss of habitat, the population is suspected to be declining.

Trend justification: The species likely used to be more widespread, but is restricted to specific habitat within the Cerrado biome, open humid grassy habitats, which are easily converted to agriculture (A. Lees in litt. 2024, E.R. Luiz in litt. 2024). It is thought to be undergoing slow declines as a consequence of the ongoing conversion and degradation of its grassland habitat (Collar et al. 1992, Fitzpatrick and Kirwan 2023). The rate of reduction is unknown, and the rate of habitat loss relevant for the species has also not been quantified.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Bolivia	extant	native	yes
Brazil	extant	native	yes
Paraguay	extant	native	yes
Suriname	extant	native	yes

Country/Territory	IBA Name
Bolivia	Cercanías de Riberalta
Bolivia	Cerrado de Riberalta
Bolivia	Noel Kempff Mercado
Brazil	Campo do Alto Marmelos
Brazil	Cerrados do Nordeste de Tocantins
Brazil	Jalapão
Brazil	Lizarda
Brazil	Monumento Natural das Árvores Fossilizadas e Adjacências
Brazil	Savanas do Amapá
Suriname	Sipaliwini Nature Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Grassland	Subtropical/Tropical Dry	major	resident
Savanna	Dry	major	resident
Shrubland	Subtropical/Tropical Dry	major	resident
Altitude	0 - 1160 m	Occasional altitudinal limits

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
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Rufous-sided Pygmy-tyrant Euscarthmus rufomarginatus. Downloaded from https://datazone.birdlife.org/species/factsheet/rufous-sided-pygmy-tyrant-euscarthmus-rufomarginatus 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.