Cocha Antshrike
Thamnophilus praecox
Rare antbird nearly endemic to the lowlands of eastern Ecuador. It was recently found in neighboring Colombia, and is likely to occur over the border in Peru as well. Male is pure black. Female is chestnut with a black hood. Both sexes are very similar to White-shouldered Antbird, but lack blue markings around the eye. Male also similar to male White-shouldered Antshrike, but lacks white wing markings and lives in different habitat. Cocha Antshrike is usually encountered in pairs that skulk low in swampy forest along the edge of ponds and sluggish creeks. Typical song is a fast, monotonous series of clucks.
识别特征
The cocha antshrike is about 16 cm (6.3 in) long. 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 sexual dimorphism. Adult males are entirely black except that their underwing coverts are white, a feature that is seldom visible in the field. Adult females have a black head, throat, and upper breast. Some individuals have faint white streaks on their throat. The rest of their body, their wings, and their tail are cinnamon-rufous; their underparts are slightly paler than their back.
分类信息
The cocha antshrike is monotypic. It and the black antshrike (T. nigriceps) are sister species.
- 学名
- Thamnophilus praecox
- 命名信息
- Zimmer, JT, 1937
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Thamnophilus
分布与栖息地
The cocha antshrike was long thought to be endemic to northeastern Ecuador, where it occurs locally along the Rio Napo and its tributaries. The International Ornithological Committee lists it that way. However, by 2021 the South American Classification Committee of the American Ornithological Society (SACC) had recognized that it also occurred further upstream in that river system in extreme south-central Colombia. In March 2024 the SACC recognized documented records from Peru. In late 2023 the Clements taxonomy revised its range statement to read "northeastern Ecuador (locally along the Río Napo and its tributaries in eastern Napo and eastern Sucumbíos) and adjacent Colombia (locally in Putumayo and southwestern Caqueta); disjunctly in northern Peru (on the Canal de Puinahua, in south-central Loreto)".<p>The cocha antshrike is found along blackwater rivers, usually small ones, in seasonally flooded várzea forest. It favors dense thickets and tangles. In elevation it occurs between about 160 and 300 m (500 and 1,000 ft) above sea level.
- 迁徙
- Resident species
行为
The cocha antshrike is presumed to be a year-round resident throughout its range.<p>The cocha antshrike's diet is not known but is assumed to be insects and other arthropods. It usually forages singly or in pairs and seldom joins mixed-species feeding flocks. It forages in dense vegetation where it hops among branches to glean prey.<p>Nothing is known about the cocha antshrike's breeding biology.<p>The cocha antshrike's song is "a hollow, evenly paced ko-ko-ko-ko-ko-ko-ko-ko-ko-ko"; it sometimes follows it with a shorter and higher pitched version of the song. Its calls include "a mellow 'pwow-pwow' and a more trilled 'krrrrrr' ".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Gray Tinamou
Tinamus tao
Very large chicken-like bird, widespread across the Amazon basin, but nowhere common. Distinguished from other tinamous by entirely gray plumage with fine black barring on the upperparts and some white speckling on the head. Gray Tinamou is also larger than other large species such as Great and White-throated Tinamous. Favors areas of upland forest and is most often encountered by voice, a single, short hollow whistle given at long intervals.
Plumbeous Pigeon
Patagioenas plumbea
Large dark pigeon of forest interior. Overall purplish-gray, slightly darker and browner on wings. Pale eye. Sexes alike. Note plainer appearance and longer tail than many other doves and pigeons. Most similar to Ruddy Pigeon but plumage grayer (not reddish) and eye paler. Usually quite secretive, staying in the canopy where singles or pairs feed on fruits. Found from lowlands into subtropical zone, up to 2,300 m (7,500 ft). More often heard than seen; listen for the cooing “who-cooks-for-you” song with the last two notes drawn out.
Ringed Antpipit
Corythopis torquatus
Small ground-dwelling flycatcher of lowland rainforest. Very unusual appearance for a flycatcher, looking more like a tiny thrush or an antbird as it struts around the ground with its body held upright. Likes to walk on logs and tree roots in mature rainforest, making short flights up to understory vegetation to catch insects. Dull brown above and white below with broad black breast streaks. Listen for its short song with a distinctive “up-down” pattern, a whistled “wheeu, pew.”
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