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

Taxonomic note

Drymophila caudata, D. klagesi, D. hellmayri and D. striaticeps (del Hoyo and Collar 2016) were previously lumped as D. caudata following SACC (2005 & updates), Sibley & Monroe (1990, 1993) 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
2023	Least Concern
2016	Near Threatened	C2a(i)
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	12 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	55,500 km2	medium
Area of Occupancy (breeding/resident)	13,300 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	3000-6700 mature individuals	poor	inferred	2023
Population trend	decreasing	-	suspected	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	2.71 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	90-94%	-	-	-

Population justification: The global population size has not been quantified, but the species appears to be rare (T. Donegan in litt. 2016, 2023).
Assuming that it occurs at the same density as a congener (D. hellmayri: 2-4 individuals/km²; E. Botero-Delgadillo in litt. 2023), and further assuming that only 25% of forests within the range are occupied to account for its apparent rarity (i.e., 2,200-2,500 km²; Global Forest Watch 2023), the population may number 4,400-10,000 individuals. This roughly equates to 3,000-6,700 mature individuals.
The species likely forms two separate subpopulations within its disjunct range, with the northern subpopulation in Yariguíes described as very small (T. Donegan in litt. 2023). Inferring from the range size it is likely that at least 90% of the total population (i.e. 2,700-6,030 mature individuals) occur in the south, while the northern subpopulation holds at most 10% of the total population (i.e. 300-670 mature individuals).

Trend justification: There are no data on the population trend, but the only known threat is the loss and degradation of its forest habitat. Over ten years, 2% of tree cover is lost within the range (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein).
Even though the species' exact habitat requirements are not well known, it is likely restricted to dense bamboo thickets within forests. Consequently, the slow loss and degradation of forests within the range is suspected to cause a slow population decline, which is here tentatively placed in the band 1-9% over ten years.

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1190 - 2530 m	Occasional altitudinal limits	(max) 2700 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		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: East Andean Antbird Drymophila caudata. Downloaded from https://datazone.birdlife.org/species/factsheet/east-andean-antbird-drymophila-caudata on 22/12/2024.
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 22/12/2024.