Black-throated Antshrike
Frederickena viridis
Large, uncommon antbird of rainforest edge. Shy and difficult to see. Male is uniformly dark; female told by solid rufous cap and back contrasting with barred underparts. Note fierce expression and large, heavy bill. Often in pairs around old treefall gaps, forest edge, and other places with dense understory. Feeds on insects and occasionally follows army ant swarms. Female superficially similar to Fasciated Antshrike but much larger and unbarred above. Song is a slow series of whistles, similar to some calls of Black Nunbird but repeated more regularly.
识别特征
The black-throated antshrike is a large dark antbird, 19 to 22 cm (7.5 to 8.7 in) long and weighing 65 to 75 g (2.3 to 2.6 oz). The species exhibits significant sexual dimorphism, though both sexes have a crest (that usually is flattened), red irises, and a heavy black bill with a hook at the end like true shrikes. Adult males are mostly slate gray with a black head, throat, and breast, a usually hidden small white patch between their scapulars, and faint white bars on their tail. Adult females have a rufous crest, nape, upperparts, and wings. Their forehead, sides of their head, underparts, and tail are barred with pale buff to white and blackish brown; their flanks have a rufous tinge. Subadult males have mixed gray and brown upperparts and underparts like adult females'.
分类信息
The black-throated antshrike shares genus Frederickena with the undulated antshrike (F. unduliger) and fulvous antshrike (F. fulva). It is monotypic.
- 学名
- Frederickena viridis
- 命名信息
- (Vieillot, 1816)
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Frederickena
分布与栖息地
The black-throated antshrike is found from eastern Bolívar state in Venezuela east through the Guianas and through northeastern Amazonian Brazil north of the Amazon from the lower Rio Negro east to the Atlantic in Amapá. It inhabits lowland evergreen forest, typically those on sandy soils and in terra firme. It favors dense vegetation in the understorey, especially at openings such as those formed by fallen trees. In elevation it ranges from sea level to 700 m (2,300 ft) in most of its range but only to 500 m (1,600 ft) in Venezuela.
- 迁徙
- Resident species
行为
The black-throated antshrike is presumed to be a year-round resident throughout its range.<p>The black-throated antshrike's diet has not been detailed but is known to include large insects and other arthropods. It forages singly or in pairs, mostly low to the ground or on it in dense foliage and vine tangles. It hops deliberately from branch to branch and along the ground, reaching or jumping from a perch to glean prey from leaves, stems, branches, leaf litter, and rotten logs. It occasionally follows army ant swarms to catch prey disturbed by the ants.<p>The black-throated antshrike breeds between October and March in Suriname but its season is not known elsewhere. The one known nest was a basket suspended in a branch fork in a low shrub. It contained two eggs that were creamy white with purplish markings. The incubation period, time to fledging, and details of parental care are not known.<p>The black-throated antshrike's song is a "slow series of 10-15 first rising, then leveling out, fluted 'tuh' notes" that span six to seven seconds. It has also been described as "a slow, almost hypnotic [series] of clear, insistent whistles, peeeur, peeeur, peeur... at a steady pace". Its call is "a long (e.g. 1 second), nasal, downward-inflected churr".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Chapin's Apalis
Apalis chapini
Dark gray apalis with a rufous throat and breast. The color of the chin varies geographically: white in the north and rufous in the south. Found mainly in the canopy of montane forest. Usually in pairs or small groups which will join mixed-species flocks. The main vocalization is a quick series of high, insect-likes calls by the male, usually accompanied by “tip” notes from the female. Somewhat similar to African Tailorbird, but much longer-tailed, and with more rufous on the throat and less on the head.
Karoo Prinia
Prinia maculosa
An active warbler with a long graduated tail that is sometimes cocked. It is dull brown above and pale below with extensive streaks and blotches on the underparts that often extend to the throat and belly. Pairs frequent fynbos, strandveld, Karoo shrublands, and gardens, where they are active gleaners of insects, occasionally hopping on the ground. The typical song is a reedy piping “kli” note repeated 4-15 times, with scratchy buzzing notes interspersed. The similar Drakensberg Prinia differs from the Karoo Prinia by having warmer upperparts, yellower underparts, and finer streaks that are mostly restricted to the chest.
Band-tailed Barbthroat
Threnetes ruckeri
Scarce hummingbird of humid evergreen forest and edge in tropical lowlands. Favors shady understory, especially with Heliconia flowers. Usually visits flowers briefly and whips away with a sharp buzzy squeak. Note long arched bill (yellowish below), striped face, blackish throat patch, and rusty breast patch. Striking tail pattern, black with white tips, and a white base that is only readily seen when the tail is spread.
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