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
The mouse-colored thistletail is a year-round resident throughout its range.<p>The mouse-colored thistletail's diet has not been detailed but it is known to be mostly arthropods. It usually forages in pairs and only rarely joins mixed-species feeding flocks. It feeds close to the ground, gleaning prey from foliage and small branches.<p>Nothing is known about the mouse-colored thistletail's breeding biology.<p>The mouse-colored thistletail's song has been described as "a trill increasing in speed and amplitude, and slightly descending in pitch, lasting c. 2 s and repeated every 6 s kee kee-keekeekrkrrr...rrrrrr". Another source describes it as "a series of notes that accelerates into a trill, the first notes inflected 'sweeí, sweeí, sweeí, swi, ti-ti-titi-trrrrr' ". One call is "a high-pitched but descending pseeeeuw". Others are "a loud riek, tzeeek, or weeek" and "a rising whiny wee? and pee".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Willet
Tringa semipalmata
Large, stocky shorebird with a distinctive black-and-white wing pattern. Larger than Greater Yellowlegs, smaller than godwits. Overall grayish, with messy dark patterning in breeding plumage. Bill is straight and rather thick, with a paler base. Legs are grayish. Two distinct subspecies. “Eastern” Willet is smaller, darker, browner, shorter-billed, shorter-legged, and strictly coastal. Breeds in saltmarshes from Atlantic Canada to the Gulf of Mexico; migrates early, mostly departing the U.S. in August, and winters almost exclusively on the northern coast of South America. Especially likely to be seen foraging on extensive mudflats, sometimes in flocks. “Western” Willet is larger, paler, grayer, longer-billed, and longer-legged, giving it a more godwitlike appearance. Breeds in marshy grasslands in the Interior West; winters much further north than “Eastern” Willet, from both coasts of the U.S. to as far south as Chile. Especially likely to be seen on beaches.
Visayan Broadbill
Sarcophanops samarensis
A medium-sized bird of lowland forest on Bohol, Leyte, and Samar islands. Has a pale blue bill and deeper blue eye wattle, a black face, a streaked crown, a reddish-brown back, a dark wing with a pinkish to white wingbar, a thin white collar with some scaling above, and a reddish rump and tail. Underparts are white in the female and pinkish in the male. Makes short sallies for insects. Can be found in pairs, small groups, or sometimes mixed-species flocks. Unmistakable. Voice includes a plaintive whistle and a sharp “tyik!”
Grass Wren
Cistothorus platensis
Tiny, bubbly, buffy-colored wren of dense grassy or shrubby habitats. Fairly common but locally distributed from central Mexico to the southernmost tip of South America; surely comprises multiple species. Occurs from open grasslands and marshes at sea level up to paramo in the high Andes. Generally secretive, but perches up when singing. Generally pale brownish with complex patterning on upperparts; compare with much plainer House Wren. Variable voice, usually including harsh chips, buzzes, and trills.
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