Bar-bellied Woodcreeper
Hylexetastes stresemanni
Large-billed woodcreeper of lowland rainforest. Warm brown with subtle fine black barring on the undersides. Large red bill is distinctive. The similar Amazonian Barred-Woodcreeper is barred and can also have a reddish bill in some parts of its range, but the barring on Bar-bellied is restricted to the belly, and the bill is heavier, and usually brighter red. Rare in most areas; it seems to prefer upland areas and tall stunted growth. Sometimes found around army ant swarms. Its song is a loud, resounding series of ascending squeals: “chu-WEE, chu-WEE, chu-WEE, …”.
识别特征
The bar-bellied woodcreeper is one of the largest members of its subfamily. It is heavy-bodied, with a shortish tail and a short and massive bill. It is 28 to 30 cm (11 to 12 in) long. Males weigh 114 to 125 g (4.0 to 4.4 oz) and females about 100 g (3.5 oz). The sexes have the same plumage. Adults of the nominate subspecies have brown to olive-brown head, upper back, and wing coverts, with pale streaks on the forehead. Their face is plain but for paler lores. Their lower back, wings, and tail are rufous-chestnut with darker tips on the primaries. Their throat is whitish with heavy dark streaks, their upper breast olive with pale black-bordered streaks, their lower breast plain olive, and their belly and undertail coverts olive with thin blackish bars. Their iris is red-brown to bright brown, their bill dark reddish to reddish brown, and their legs and feet grayish green to dusky. Juveniles have a more rufous back than adults, a mix of streaks and bars on the throat and breast, and a more brownish bill.<p>The other two subspecies have somewhat subtle color differences from the nominate. H. s. insignis is more olivaceous on its upperparts, has no streaks on the forehead and no black on the breast streaks, has a pale moustacial stripe, and has weaker barring on the underparts. H. s. undulatus is larger than the nominate, has no forehead streaks, is slightly more olivaceous and less reddish on its underparts, and has bolder barring on its belly.
分类信息
Some authors have suggested that the bar-bellied woodcreeper and the red-billed woodcreeper (H. perrotii) are conspecific. The bar-bellied woodcreeper sensu stricto has three subspecies, the nominate H. s. stresemanni (Snethlage, 1925), H. s. insignis (Zimmer, 1934), and H. s. undulatus (Todd, 1925).
- 学名
- Hylexetastes stresemanni
- 命名信息
- Snethlage, E, 1925
- 目
- Passeriformes
- 科
- Dendrocolaptidae
- 属
- Hylexetastes
分布与栖息地
Subspecies H. s. insignis of the bar-bellied woodcreeper has a limited range north of the Rio Vaupés in extreme northwestern Brazil and extreme southeastern Colombia. The nominate H. s. stresemanni is found in the northwestern Amazon Basin of Brazil between the Rio Negro and the upper Amazon River (Rio Solimões) and west slightly into far eastern Ecuador. H. s. undulatus is found in southwestern Amazonia south of the Amazon River in eastern Peru, northern Bolivia, and Brazil at least as far east as the Rio Purus and possibly to the Rio Madeira.<p>The bar-bellied woodcreeper inhabits humid lowland forest. In Colombia it apparently is restricted to terra firme but elsewhere occurs in it and in floodplain forest. It favors the interior of primary forest but is thought to also occur at its edges and in mature secondary forest. In elevation it ranges only as high as about 300 m (980 ft) above sea level.
- 迁徙
- Resident species
行为
The bar-bellied woodcreeper is a year-round resident throughout its range.<p>The bar-bellied woodcreeper's diet and foraging behavior are not well known. It is believed to follow army ant swarms and occasionally join mixed species feeding flocks. It apparently forages by sallies from a vertical perch, fairly low when attending ant swarms and up to the subcanopy elsewhere. Its diet is known to include small insects and is suspected to also include larger arthropods.<p>Nothing is known about the bar-bellied woodcreeper's breeding biology.<p>The bar-bellied woodcreeper sings almost entirely at first light. its song is "a loud and somewhat shrill series of 4–6 almost disyllabic 'shu-reeet' whistles roughly on same pitch".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Western Yellow-billed Barbet
Trachylaemus goffinii
A large brightly colored barbet of forests and forest edges. Distinctive with its bright yellow bill, dark head, back, and tail, and yellow belly. There is regional variation within the species, especially prominent on the throat, which can be dark with small pale speckles or heavily streaked with whitish. Found in rainforest and lower montane forest, usually in the understory, and especially in treefall gaps, and along forest edges. Voice consists of a low “oop” or “op-oop” given in slow succession, sometimes for several minutes.
Yap Monarch
Monarcha godeffroyi
Unique black-and-white monarch endemic to Yap, in Micronesia, where it inhabits various forested lowland habitats, including mangroves and coastal scrub. Male has a white body and black head, wings, and tail. Female is black overall, with a white collar that widens at the chest. Juvenile is dull brown overall with a grayish head and buffy underparts; older immatures are blotchy black-brown-and-white. Forages slowly and methodically. Gives rasping and high-pitched squealing calls. Song is a series of bright, high-pitched whistles.
Rufous Twistwing
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Large flycatcher with uniform bright cinnamon plumage. Inhabits the understory of large stands of bamboo within humid forests. The song is a series of descending musical whistles “pew-pur-pur-pur-pur.” The smaller Brownish Twistwing has a whitish belly. Rufous Casiornis is much smaller, with different proportions, and does not usually occur in humid forests.
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