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

Taxonomic note

Thryophilus nicefori (del Hoyo and Collar 2016) was previously listed as Thryothorus nicefori.

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
C2a(i)	C2a(i); D	C2a(i); D1

Red List history

Year	Category	Criteria
2021	Critically Endangered	C2a(i)
2016	Critically Endangered	C2a(i); D
2015	Critically Endangered	C2a(i); D
2012	Critically Endangered	C2a(i);D
2011	Critically Endangered	C2a(i)
2010	Critically Endangered	C2a(i)
2009	Critically Endangered	C2a(ii); D1
2008	Critically Endangered
2004	Critically Endangered
2000	Critically Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

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)	7,900 km2	medium
Area of Occupancy (breeding/resident)	1,736 km2
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	160-170 mature individuals	good	estimated	2016
Population trend	decreasing	poor	inferred	-
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Generation length	2.7 years	-	-	-
Number of subpopulations	2-10	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: Surveys between 2004 and 2008 recorded 77 individuals. Further records suggest that the population may number up to 250 individuals (S. Valderrama in litt. 2010; Renjifo et al. 2016). This roughly equates to 160-170 mature individuals.
Observational records suggest that the species forms several small subpopulations (eBird 2021); it is tentatively assumed that no subpopulation contains more than 50 mature individuals (Renjifo et al. 2016).

Trend justification: The species is suspected to be in decline owing to forest conversion for agricultural purposes. It has been estimated that the species has already lost almost 95% of its original habitat (Renjifo et al. 2016). Between 2001 and 2011, c. 14% of its habitat has been lost (Renjifo et al. 2016). Assuming that habitat loss is continuing at the same rate to the present day and that population declines are roughly equivalent to the rate of forest loss, the species may have declined by 10-19% over the past ten years.

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

Country/Territory	IBA Name
Colombia	Bosques Secos del Valle del Río Chicamocha
Colombia	Cerro La Judía
Colombia	Soatá

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Dry	major	resident
Shrubland	Subtropical/Tropical Dry	major	resident
Altitude	1100 - 2100 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		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Annual & perennial non-timber crops - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Abstraction of surface water (unknown use)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Increase in fire frequency/intensity	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: Niceforo's Wren Thryophilus nicefori. Downloaded from https://datazone.birdlife.org/species/factsheet/niceforos-wren-thryophilus-nicefori on 23/12/2024.
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 23/12/2024.