Bolivian Slaty-Antshrike
Thamnophilus sticturus
Small antshrike. Males are mostly gray, with a black crown and white-spotted black wings and tail. Females are mostly rusty-colored, with whitish underparts. Note the pale eyes, which help to differentiate this species from similar slaty-antshrikes. Found in semideciduous forests with dense vine tangles and adjacent second growth. Forages from the understory to middle levels and apparently does not accompany mixed-species flocks. The song is a series of nasal notes ending with a rattle.
识别特征
The Bolivian slaty antshrike is about 14 cm (5.5 in) long and weighs 18 to 20 g (0.63 to 0.71 oz). Members of genus Thamnophilus are largish members of the antbird family; all have stout bills with a hook like those of true shrikes. This species exhibits significant sexual dimorphism. Adult males have a gray forehead and a black crown. Their back is gray with a few black spots and a hidden white patch between their scapulars. Their face is gray. Their wings, scapulars, and wing coverts are black with white spots and edges. Their tail is black with white tips and spots on the feathers. Their underparts are light gray with much white on the belly. Adult females have a bright reddish-brown crown and yellowish olive-brown upperparts. Their wings are dark brown with white spots and edges on the scapulars and pale buff edges on the flight feathers. Their tail is dark brown with white tips and spots on the feathers. Their underparts are white in the center and light yellowish brown across the breast and on the sides, flanks, and crissum.
分类信息
The Bolivian slaty antshrike was described by the Austrian ornithologist August von Pelzeln in 1868 and given its current binomial name Thamnophilus sticturus. It was later treated as a subspecies of T. punctatus, which was then called the slaty antshrike. Following the results of a study published in 1997, the slaty antshrike was split into six species, of which the Bolivian slaty antshrike is one. To avoid confusion the remnant T. punctatus was given its present name of northern slaty antshrike.<p>The Bolivian slaty antshrike is monotypic.
- 学名
- Thamnophilus sticturus
- 命名信息
- Pelzeln, 1868
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Thamnophilus
分布与栖息地
The Bolivian slaty antshrike is found in the central Bolivian departments of Beni, Cochabamba, and Santa Cruz, in adjoining extreme western parts of the Brazilian the states of Mato Grosso and Mato Grosso do Sul, and in far northern Paraguay's Alto Paraguay department. It inhabits the understorey to mid-storey of dry semi-deciduous forest, gallery forest, larger areas of more humid forest, and secondary forest. In elevation it reaches 600 m (2,000 ft) in Brazil and 950 m (3,100 ft) in Bolivia.
- 迁徙
- Resident species
行为
The Bolivian slaty antshrike is presumed to be a year-round resident throughout its range.<p>The diet of the Bolivian slaty antshrike has not been detailed but is assumed to be arthropods. It usually forages singly or in pairs. It usually forages in the understorey to mid-storey, mostly between 1 and 7 m (3 and 23 ft) of the ground. It hops through vegetation, gleaning prey while reaching from a perch; it also makes short upward sallies. It takes prey from leaves, branches, and vines. It is not known to join mixed-species feeding flocks or follow army ant swarms.<p>Nothing is known about the Bolivian slaty antshrike's breeding biology.<p>The Bolivian slaty antshrike's song is "a series starting slowly and speeding up into rattling trill, rises in frequency and intensity, reaching peak near end of trill, then falls off". Its call is "a 'caw' note" of variable length that sometimes becomes a "harsh, downward inflected growl".
保护状况
- 种群趋势
- unknown
照片
分布
鸟叫声
其他鸟类
Sjöstedt's Greenbul
Baeopogon clamans
A unusual dark greenbul often found near water in the forest interior. Decorated in various shades of dark and olive green, with a gray throat that contrasts with the breast, a buffy belly, and bright white sides of the tail. Can be confused with both Honeyguide Greenbul and actual honeyguides, but the flight is direct rather than undulating, the throat contrasts with the breast, the eyes are always dark, and the vocalizations are distinctive. Can be located by its “REHR!” calls, often followed by a series of fast, scratchy notes and sometimes repeated for minutes on end.
Eurasian Wren
Troglodytes troglodytes
Tiny brown bird that often holds its short little tail cocked up. Often sings from a fairly exposed perch, but at other times rather mouselike, creeping in brambles and understory. As such, can be quite inconspicuous. Favors wooded areas with a dense understory, as well as gardens, hedges in farmland, heathland, and coastal cliffs. Heard much more than seen: song is loud, bright, and musical, a varied series of trills and ringing warbles, repeated. Chipping calls can also give away its presence.
Cock-tailed Tyrant
Alectrurus tricolor
A remarkable flycatcher; males are black above and white below with a broad tail that has longer central feathers and is usually held perpendicular to the others and spread like a fan. Females are mottled brown above and whitish below without the cocked tail. Occurs in open, humid, and tall grass savanna areas that have been well preserved. Mostly silent.
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