Mouse-colored Thistletail
Asthenes griseomurina
Little brown bird with a long, wispy tail found at high elevations near treeline in the Andes of southern Ecuador and northern Peru. White eye-ring, lack of an eyebrow, and brown (not chestnut) upperparts help separate it from White-chinned Thistletail; also note range. Mouse-colored is found alone or in pairs in dense shrubbery and stunted forest. Typical song is a rising, piping series that quickly accelerates into a trill.
识别特征
The mouse-colored thistletail is 18 to 21 cm (7.1 to 8.3 in) long and weighs 15.5 to 19 g (0.55 to 0.67 oz). The sexes have the same plumage. Adults have a faint light gray-brown supercilium and a white eyering on an otherwise gray face. Their crown, back, rump, wings, and tail are dull olive-brown. Their tail is long and deeply forked with few barbs at the feather ends that give a ragged appearance. Their throat is pale gray or grayish brown (often with faint white streaks on the chin) and the rest of their underparts are pale grayish brown. Their iris is brown, their maxilla dark gray, their mandible paler but variable, and their legs and feet blue-gray.
分类信息
The mouse-colored thistletail and many other thistletails were previously treated as subspecies of the white-chinned thistletail (A. fuliginosa). All of them were in genus Schizoeaca but genetic data showed that the genus is embedded within Asthenes. The mouse-colored thistletail possibly should again be treated as a fifth subspecies of the white-chinned. The mouse-colored thistletail is monotypic.
- 学名
- Asthenes griseomurina
- 命名信息
- (Sclater, PL, 1882)
- 目
- Passeriformes
- 科
- Furnariidae
- 属
- Asthenes
分布与栖息地
The mouse-colored thistletail is found on both slopes of the Andes from Ecuador's Azuay and Morona-Santiago provinces south into far northern Peru's departments of Piura and Cajamarca, and also in the separate Cordillera del Cóndor in Amazonas Department. It inhabits páramo grasslands, the tree line ecotone between them and cloudforest, and Polylepis woodlands. In Ecuador it mostly ranges between 2,800 and 4,000 m (9,200 and 13,100 ft) of elevation but occurs locally as low as 2,500 m (8,200 ft). In Peru's Andes it occurs between 2,900 and 3,300 m (9,500 and 10,800 ft) and at about 2,150 m (7,100 ft) in the Cordillera del Cóndor.
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Banggai Golden-Bulbul
Hypsipetes harterti
A noticeably long-billed thrush-sized bird with an olive head and upperside and uniform yellow underparts. Pairs or small groups inhabit forests, edges, and plantations in the lowlands and foothills. Endemic to the Banggai Islands, where it is the only bulbul present. Vocalizations include a rollicking “cheE-chewoo-chewoo” as well as harsh rasping notes and soft “whip” and bubbling calls.
Streak-throated Bush-Tyrant
Myiotheretes striaticollis
Fairly large flycatcher of the Andes from Venezuela to Argentina. Conspicuous orangish belly and black-and-white streaked throat make this bush-tyrant fairly easy to identify. Also note larger size than Smoky Bush-Tyrant and heftier bill. Typically found in open habitats, usually at the forest edge. Singles or pairs perch conspicuously, sometimes even on telephone wires.
Laysan Duck
Anas laysanensis
Highly range-restricted duck with a splotchy white “comma” around each eye. Found only on the Midway Islands, where it is the only resident duck. Forages on sand flats and small saline ponds and lakes on the islands, frequently consuming brine flies. Capable of flight, but typically only traverses short distances within islands. Gives various nasal and grating quacks.
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