Sakhalin Leaf Warbler
Phylloscopus borealoides
Small songbird, virtually identical in plumage to Pale-legged Leaf Warbler, of which it was formerly considered a subspecies. Vertical tail pumping distinguishes this species from most others in its range except Pale-legged. Forages through the different layers of forest and like Pale-legged (and unlike most other leaf warblers) sometimes forages on the ground. Call note is a hard metallic “pit,” similar to Pale-legged, but marginally lower in frequency (visible on spectrogram); song a series of rhythmic whistles with clear distinctions between each note, very unlike the high, rapid trill of Pale-legged. Breeds in forest edges and clearings; can be found in a range of wooded habitats in migration and on wintering grounds.
识别特征
It has a long white supercilium and broad, dark brown eye-stripes. Its crown, upper parts, and bill are also dark brown. It has greenish-brown cheeks and its ear-coverts are mottled. Its bill has a pink base that extends to the lower mandible. Its legs are pale pinkish-brown. <p>It is easily confused with the pale-legged leaf warbler. One possible distinguishing feature is that its upperparts are slightly more greenish. It is more easily distinguished by its lower-pitched vocalizations, but some overlap does exist in the species' pitch ranges.
分类信息
- 学名
- Phylloscopus borealoides
- 命名信息
- Portenko, 1950
- 目
- Passeriformes
- 科
- Phylloscopidae
- 属
- Phylloscopus
分布与栖息地
- 繁殖区
- PAL : Sakhalin (se Russia) and s Kuril Is., Hokkaido and Honshu (n, c Japan)
- 非繁殖区
- poorly known; se Asia, Singapore, Ryukyu Is. (s Japan)
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
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