Streaked Reed Warbler
Acrocephalus sorghophilus
A mysterious and secretive reed warbler; formerly fairly common but now increasingly rare and possibly near extinction. The only Asian reed warbler with a streaked crown and back. Adults bear a passing resemblance to the much more common Black-browed Reed Warbler but have prominent striping all along the back and crown, a less contrasting brow pattern, and are noticeably paler in color. Recorded in marshes and wet fields on passage and during the winter, but breeding grounds remain unknown. Gives a rattling, grating song akin to a Oriental Reed Warbler, but reportedly quieter.
识别特征
EBird describes the bird as "A mysterious and secretive reed warbler; formerly fairly common but now increasingly rare and possibly near extinction. The only Asian reed warbler with a streaked crown and back. Adults bear a passing resemblance to the much more common Black-browed Reed Warbler but have prominent striping all along the back and crown, a less contrasting brow pattern, and are noticeably paler in color. Recorded in marshes and wet fields on passage and during the winter, but breeding grounds remain unknown. Gives a rattling, grating song akin to an Oriental Reed Warbler, but reportedly quieter."
分类信息
Genus: Acrocephalus; Family: Acrocephalidae; Order: Passeriformes.
- 学名
- Acrocephalus sorghophilus
- 命名信息
- (Swinhoe, 1863)
- 目
- Passeriformes
- 科
- Acrocephalidae
- 属
- Acrocephalus
分布与栖息地
On passage, it has been recorded in marshland and millet crops, and it occurs near the water in reed and grass marshes in the winter. It possibly uses willow scrub and reedbeds in its breeding range. It probably feeds largely on invertebrates and may consume seeds but more research is needed. Spring passage in China is from late May to early June, with autumn passage from late August to early September. All Philippine records are from September to June.<p>IUCN has assessed this bird as critically endangered with the population estimated at just 250 to 999 mature individuals and continuing to decline. This species' main threat is habitat loss with wholesale clearance of wetland habitats particularly the only known wintering ground in Candaba Swamp which has been converted into agricultural lands, particularly for rice. <p>The Candaba Swamp is a Ramsar site; however, habitat conversion and hunting still continues.<p>Conservation actions proposed include attempting to locate the breeding areas in China and Russia; surveying wetlands in the Philippines to try and locate further wintering sites; and initiating a new ringing programme at Dalton Pass and other migrant trapping locations. Investigation of the potential for stable isotope analysis of museum specimens could identify areas in which the species breeds. Finally, it should be listed as a protected species in China.
- 繁殖区
- PAL : ne China
- 非繁殖区
- se China, Philippines (rare)
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
其他鸟类
Yellow-bellied Elaenia
Elaenia flavogaster
Rather bulky small flycatcher, widespread in tropical lowlands. Fairly common in overgrown brushy clearings, savannas, and other semi-open areas with scattered bushes. Looks like many other small flycatchers, and where multiple species of elaenias occur it is often not possible to identify birds to species. On Yellow-bellied, note its spiky, white-based crest (rarely held flattened), burry drawled call, whitish wingbars, and pale yellow belly; does not flick its wings or tail.
Mascarene Petrel
Pseudobulweria aterrima
An entirely dark petrel that usually has a cross-like shape in flight. Note the large, square head, the thick bill, and the long rear. Critically endangered; nests on cliffs and crevices on the island of Reunion and feeds in the surrounding ocean. The vocalization is an eerie scream, given at night around breeding sites. Separation from several similar species is tricky. Most similar to Great-winged Petrel, and distinguished only by subtle differences, including the heavier head and bill, longer neck and tail, more rounded wing, and less explosive flight. Also similar to Jouanin’s Petrel, but identified by larger size, longer wings that are held straighter, and shorter rear. Separated from Wedge-tailed Shearwater by the much heavier bill, and from dark-morph Trindade Petrel by the lack of a silver flash in the underwing.
Broad-tailed Paradise-Whydah
Vidua obtusa
Lays its eggs in the nests of Orange-winged Pytilia. The distinctive breeding male has a long, broad tail. Non-breeding males and females are nondescript sparrow-like birds with striped heads and pale underparts. Found in broadleaf woodland, mainly miombo. Most records are of the conspicuous and easily identified breeding-plumaged males. Mimics the inconspicuous vocalizations of its host Orange-winged Pytilia. Breeding male is similar to Eastern Paradise-Whydah, but has a shorter and broader tail, and darker buff and rufous coloration on the nape and breast. Non-breeding male and female are very similar to Eastern, but have a paler bill and lack strong “comma” marks on the cheek. Also similar to female and non-breeding male indigobirds, but larger.
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