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

Taxonomic note

Eubucco versicolor, E. steerii and E. glaucogularis (del Hoyo and Collar 2014) were previously lumped as E. versicolor following Sibley and Monroe (1990, 1993).

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(ii)

Red List history

Year	Category	Criteria
2021	Near Threatened	C2a(ii)
2016	Near Threatened	A2c+3c+4c; C2a(ii)
2014	Near Threatened	A2c+3c+4c; C2a(ii)

Migratory status	not a migrant	Forest dependency	High
Land mass type		Average mass	33 g

	Estimate	Data quality
Extent of Occurrence breeding/resident (km2)	38,600	medium
Extent of Occurrence breeding/resident (km2)	15,500
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	5000-40000	poor	inferred	2021
Population trend	Decreasing		inferred	-
Decline (3 years/1 generation past)		-	-	-
Decline (5 years/1 generation past)		-	-	-
Decline (10 years/1 generation past)		-	-	-
Decline (10 years/3 generation future)	1-19	-	-	-
Decline (10 years/3 generation past and future)	1-19	-	-	-
Number of subpopulations	1	-	-	-
Percentage in largest subpopulation	100	-	-	-

Population justification: The global population size has not been quantified directly, but the species is described as 'uncommon' (Stotz et al. 1996). Congeners are known to occur at a density of 1-8 mature individuals/km² (Eubucco richardsoni and E. tucinkae in Peru; Santini et al. 2018). About 10,000 km² within the range is covered by forest (Global Forest Watch 2021); assuming that 50% is occupied by this species, the population may number 5,000-40,000 mature individuals. In view of its apparent rarity, the true population size may be closer to the lower end of the estimate.

The species is monotypic; therefore it is tentatively assessed as functioning as one subpopulation.

Trend justification: The population trend has not been assessed directly, but it is inferred that this strictly forest-dependent species is undergoing a decline due to the loss and degradation of forests within the range. Over the past ten years, tree cover within the range has been lost at a rate of 6% (Global Forest Watch 2021). Based on deforestation rates between 2016 and 2020 and extrapolating into the future, the rate of tree cover loss may increase to 8% over the next ten years (Global Forest Watch 2021). Given that the species is highly dependent on forest and potentially susceptible to fragmentation and edge-effects, the rate of population decline may be higher than the rate of forest loss and as such the species may be declining at up to 19% over ten years.

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

Country/Territory	IBA Name
Peru	Cordillera Vilcabamba
Peru	Cordillera Yanachaga

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1000 - 2000 m	Occasional altitudinal limits	675 - 2500 m

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 degradation, 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 degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2023) Species factsheet: Eubucco glaucogularis. Downloaded from http://www.birdlife.org on 08/02/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 08/02/2023.