Mekong Wagtail
Motacilla samveasnae
Large black-and-white wagtail with an intricately and uniquely striped head pattern. Wings and outer tail feathers flash brightly in flight. Adult male is black-backed, while the female and immature have a duller gray-brown back. Simple song is a compilation of a few high phrases of whistles and twitters. Call is harsh and buzzy. Found only around flowing lowland rivers with braided rocky sections, specifically a unique composite of gravel and sand bars with low vegetation and boulders.
识别特征
The Mekong wagtail most closely resembles African pied wagtail M. aguimp, although two species ranges are far apart. It differs from M. agiump in several minor respects, particularly wing pattern, and its vocalisations are very distinctive. It is a very distinctive species and is the only black-and-white wagtail in South-East Asia which exhibits the plumage character combination of black forehead, lores and ear coverts, obvious white supercilia, with white a throat and neck patch.
分类信息
The species was overlooked until 2001 when it was described. It is named in honour of the late Cambodian ornithologist Sam Veasna. It is most similar in appearance to the African pied wagtail but genetic evidence suggests that the two are not more closely related to each other compared to other black and white wagtails such as the white wagtail M. alba complex or the white-browed wagtail M. maderaspatensis.
- 学名
- Motacilla samveasnae
- 命名信息
- Duckworth, Alström, Davidson, PJ, Evans, Poole, Setha & Timmins, 2001
- 目
- Passeriformes
- 科
- Motacillidae
- 属
- Motacilla
分布与栖息地
The Mekong River breeding in Cambodia and Laos, but apparently it is a non breeding visitor to Thailand. It also occurs in Vietnam. The Mekong wagtail is found in wide lowland river channels. Territorial birds are associated with fast-flowing braided sections of river which flow through a distinctive landscape of rocks, bushes adapted to prolonged seasonal submersion, mainly Homonoia riparia, with sandbars and gravel shoals. As river levels rise during the May/June–October/November rainy season these features become flooded. The species concentrates along earthen banks and associated overhanging vegetation, and patches of exposed sand and silt, where they occur in pairs, some of which are highly territorial, and small flocks of less than a dozen birds.
- 迁徙
- Resident species
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Fraser's Eagle-Owl
Ketupa poensis
Medium-sized rufous-brown owl, with long ear tufts. Note the dark eyes, rufous face, and cleanly barred underparts. Found in and around humid forest. The main vocalization is a long, haunting whistle that first rises, then falls and fades. Secondary vocalization is a low, rapid, pulsating series of hoots. Similar in shape to Akun Eagle-Owl, but has dark rather than yellow eyes, more rufous coloration, and cleaner markings on the underparts. Also similar to Spotted Eagle-Owl, but much more richly colored, with darker eyes.
Asian Woolly-necked Stork
Ciconia episcopus
A dark-brown stork with green-bronze iridescence on the wings and breast. It has a distinctive white ruffled neck, a white tail, and a dark salmon-tipped bill. Resident and migrant. Individuals and small groups forage in rivers, shallow wetland margins, urban grassy areas, and flooded grasslands for insects and small vertebrates. May gather in groups of several hundred when conditions are suitable.
Red-throated Piping-Guan
Pipile cujubi
Large black-and-white guan with a red dewlap. Subspecies vary in the size of the dewlap and in the amount of white on the crest. Other piping-guans have a different face pattern and/or dewlap color. Largely arboreal, but may descend to the ground. Occurs in forests, especially riverine forests, where sometimes encountered in flocks of up to 30 individuals. Gives a rising series of clear whistles, and at dawn produces a wing-whirring display.
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