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

Taxonomic note

Pycnonotus bimaculatus and P. snouckaerti (del Hoyo and Collar 2016) were previously lumped as P. bimaculatus following Sibley & Monroe (1990, 1993).

 

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
-	C2a(ii)	B1ab(v); C2a(i,ii); D1

Red List history

Year	Category	Criteria
2020	Endangered	C2a(ii)
2016	Vulnerable	C2a(ii)
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	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	16,300 km2
Number of locations	2-5	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	poor	suspected	2020
Population trend	decreasing	-	inferred	2013-2024
Rate of change over the past 10 years/3 generations (longer of the two periods)	11-20%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	11-20%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	11-20%	-	-	-
Generation length	3.5 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Given the species's restricted range throughout the Gunung Leuser National Park only, but with its true range likely confided to 1-3 sites (F. Rheindt in litt. 2020, J. Eaton in litt. 2020), it has been estimated that there may only be more than 250 mature individuals left (F. Rheindt in litt. 2020). Thus, the population size is placed here in the band of 250-999 mature individuals, roughly converted to 375-1,500 individuals.

Trend justification: The population is inferred to be undergoing a continued decline at a moderate rate given the observation of trapping for the cage bird trade at locations for the species and observations of disappearance of the species from one of very few currently known locations (Eaton and Collar 2015).

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

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	suitable	resident
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Shrubland	Subtropical/Tropical High Altitude	suitable	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Species disturbance, Species mortality

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Aceh Bulbul Pycnonotus snouckaerti. Downloaded from https://datazone.birdlife.org/species/factsheet/aceh-bulbul-pycnonotus-snouckaerti on 05/12/2024.
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 05/12/2024.