Bare-faced Bulbul
Nok hualon
Sickly-looking, greenish-brown bulbul with a naked pink head. Endemic to Laos, where it is found solely in limestone karst forest; favors areas with bushy cover. Forages in the canopies of shrubs and small trees. Gives a fluid rising trill and harsher rattling calls.
识别特征
The mainly olive-green bare-faced bulbul is distinctive in having a bare pink face with blueish skin around the eyes. The two specimens so far collected were around 20 cm in length and weighed 32-40 g. The breast and belly are fawn-grey, the uppersides olive and the throat is off-white. According to researchers, its call is a "dry bubbly tweet".
分类信息
The species epithet hualon is from the Lao word for "bald-headed". A 2018 molecular phylogenetic study of the bulbuls suggested that the species does not fit in the clade containing the core Pycnonotus and stood apart suggesting its placement in a new genus Nok from Lao language for "bird" as Nok hualon.
- 学名
- Nok hualon
- 命名信息
- (Woxvold, Duckworth & Timmins, 2009)
- 目
- Invalid Latin name
- 科
- Threskiornithidae
- 属
- Nok
分布与栖息地
The bare-faced bulbul is known only from the limestone karst region near Pha Lom in central Laos. The area is characterised by steep terrain with bare limestone and low (less than 4 m in height) deciduous trees and shrubs. It seems likely that the species is restricted entirely to this habitat, though it may occur at other sites in Laos with similar habitats. Observations of similar birds were made in 1995 at another site. Limestone karst is the habitat of several newly discovered endemic species, including the unusual Laotian rock rat.
- 迁徙
- Resident species
行为
The bare-faced bulbul is mainly arboreal but sometimes perches on rocks on the steep hillsides. It is a conspicuous species, foraging during the day in pairs or as singles. Single birds tend to call regularly, and will link up with another before flying to a new area to forage. They have not been observed to join mixed-species feeding flocks. The breeding behaviour of this species has not yet been observed.
保护状况
The bare-faced bulbul was assessed for the first time in 2010 by BirdLife International as of Least Concern, on the basis that the species has a large range, and there is insufficient evidence on population trend and size. In the paper describing the species it was suggested that it be listed as data deficient until further surveys of likely habitat were undertaken. The limestone karst in which it lives is threatened by quarrying and habitat degradation caused by overgrazing.
- 种群趋势
- declining
照片
分布
其他鸟类
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