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Bare-faced Bulbul Pycnonotus hualon
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This species has a large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend is not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic note
Pycnonotus hualon was described as new to science by Woxvold et al. (2009).

Striking and diagnostic features are the near-absence of countour feathering on the face and side of the head, the presence of extensive pale blue periorbital and loral skin and orange-pink skin on the rear sides of the head and below the eye to the malar area; and loose, hair-like filoplumes along the mid-crown and reduction of anterior ear-coverts to a series of unbarbed bristles that cover the ear opening. Grey-brown body colouring and olive-toned upperparts, erectile nuchal collar, distinctly paler, fawn-grey underparts, off-white throat and olive-green remiges in folded wings. Voice. Most common vocalisation is a short (<1 second) series of whistled, dry bubbling notes.

Distribution and population
Pycnonotus hualon is known from Savannakhet province, Laos, although there is strong evidence that the species is also present in Bolikhamxai and Khammouan province (J. Pilgrim in litt. 2009, Woxvold et al. 2009).

Population justification
The global population size has not been quantified, but based on observations the species appears to be locally common.

Trend justification
The species is suspected to be undergoing a slow rate of decline, as, although large sections of its range may be protected by the Phou Hinpoun and Hin Namno National Protected Areas, populations outside these areas are likely to be declining owing to quarrying, hunting and habitat degradation caused by livestock grazing and firewood collection (Woxwold et al. 2009; J. Pilgrim in litt. 2009).

This species occupies the middle and upper levels of karst outcrops, where soil is almost absent and vegetation is dominated by small deciduous trees and shrubs. It is thought to feed on fruits and berries (Woxvold et al. 2009).

This species may be undergoing a slight decline due to quarrying, hunting and habitat degradation due to livestock grazing and firewood collection (Woxvold et al. 2009).

Conservation Actions Underway
The species is thought to be present in the Phou Hinpoun and Hin Namno National Protected Areas (Woxvold et al. 2009). Conservation Actions Proposed
Conduct surveys to establish the range and population size

Related state of the world's birds case studies

Woxvold, I. A.; Duckworth, J. W.; Timmins, R. J. 2009. An unusual new bulbul (Passeriformes: Pycnonotidae) from the limestone karst of Lao PDR. Forktail: 1-12.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Calvert, R.

Pilgrim, J.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Pycnonotus hualon. Downloaded from on 25/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 25/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Additional resources for this species

ARKive species - Bare-faced bulbul (Pycnonotus hualon) 0

Key facts
Current IUCN Red List category Least Concern
Family Pycnonotidae (Bulbuls)
Species name author Woxvold, Duckworth and Timmins, 2009
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 25,200 km2
Country endemic? Yes
Links to further information
- Additional Information on this species