Blue-wattled Bulbul (Pycnonotus nieuwenhuisii)

Blue-wattled Bulbul Pycnonotus nieuwenhuisii

Current view: Data table and detailed info

Taxonomy

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.

IUCN Red List criteria met and history

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Data Deficient
2016	Data Deficient
2012	Data Deficient
2008	Data Deficient
2004	Data Deficient
2000	Not Evaluated
1996	Data Deficient
1994	Data Deficient
1988	Threatened

Species attributes

Migratory status	unknown	Forest dependency	medium
Land-mass type		Average mass	-

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	650,000 km²	medium
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	unknown	-	-	-
Generation length	3.46 years	-	-	-

Population justification: Impossible to determine. It is known from only two specimens, both taxonomic types, and observations in Brunei from more than 25 years ago (see Collar 2014). If the species is indeed valid, the paucity of records may ostensibly suggest it is very rare, although Pycnonotus bulbuls are rarely so, and the area of lowland forest within this species' range (which is relatively well explored), is vast.

Trend justification: Undetermined. The confusion over its range and taxonomic status, as well as the total absence of data on its breeding biology, precludes the identification of likely threats.

Country/territory distribution

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

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name
Indonesia	Gunung Leuser
Indonesia	Kayan Mentarang

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Shrubland	Subtropical/Tropical Moist	major	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	60 - 700 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Blue-wattled Bulbul Pycnonotus nieuwenhuisii. Downloaded from https://datazone.birdlife.org/species/factsheet/blue-wattled-bulbul-pycnonotus-nieuwenhuisii 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.