Roraiman Antwren
Herpsilochmus roraimae
A common but inconspicuous bird of tepui forest canopy. Usually seen from below; note long shape accentuated by heavy bill and long tail. Male is gray above and white below, with a black crown, bold white eyebrow, wing spotting, and extensively white undertail. Females are similar to males but have more brown tones in plumage. Forages sluggishly in canopy of tepui foothill forest, searching for insects along branches and in leaf clusters. More common at lower elevations than many other tepui endemics (sometimes below 500 m). Usually in pairs and best detected by voice; often follows mixed-species flocks but also found away from them. Contact call is a rubbery smacking, often doubled and repeated in long series by members of a pair. Song is a hoarse, emphatic series of laughing notes, decelerating and dropping slightly in pitch. Similar to Spot-tailed and Todd’s antwrens (and may overlap with latter at lower elevations) but substantially larger, with bolder markings and more white in tail; song is similar to that of Todd’s but longer and hoarser.
识别特征
The Roraiman antwren is 12 to 13 cm (4.7 to 5.1 in) long and has the longest tail within genus Herpsilochmus. Adult males of the nominate subspecies have a black crown and nape, a long pale gray to white supercilium, a black streak through the eye, and grayish ear coverts. Their back and rump are dark gray with white edges on many back feathers and blackish patches. They have white-edged black scapulars and a white patch between them. Their wings are black with white-tipped coverts and flight feathers with white edges towards the end. Their tail is black with white feather tips, white spots on the central feathers, and white edges on the outer feathers. Their throat and underparts are mostly gray with a white belly center. Adult females have white spots on their crown, a buff tinge to the sides of their neck, light buff breast and sides, and smaller tail spots than males. They are otherwise like males. Males of subspecies H. r. kathleenae are like the nominate. Females have grayer upperparts and pale gray (not light buff) breast and sides.
分类信息
The Roraiman antwren was first described by the Austrian ornithologist Carl Hellmayr in 1903 with the type locality in Guyana on Mount Roraima. Its relationship to others of its genus is unclear but it apparently is most closely related to the spot-backed antwren (H. dorsimaculatus).<p>The Roraiman antwren has two subspecies, the nominate H. r. roraimae (Hellmayr, 1903) and H. r. kathleenae (Phelps Jr & Dickerman, 1980).
- 学名
- Herpsilochmus roraimae
- 命名信息
- Hellmayr, 1903
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Herpsilochmus
分布与栖息地
The Roraiman antwren is a bird of the tepui region where southern Venezuela, western Guyana, and northwestern Brazil meet. The nominate subspecies is found in Venezuela's Bolívar state, extreme northern Roraima in Brazil, and west-central Guyana. Subspecies H. r. kathleenae is found in Venezuela's Bolívar and Amazonas states and extreme northern Amazonas state in Brazil. The species inhabits the subcanopy and canopy of wet evergreen forest, at lower elevations in taller trees on rich soil. It also occurs in more stunted forest towards the tops of tepuis and the ecotone between the stunted forest and the brushy savanna above it. In elevation it ranges between 700 and 2,000 m (2,300 and 6,600 ft).
- 迁徙
- Resident species
行为
The Roraiman antwren is thought to be a year-round resident throughout its range.<p>The Roraiman antwren's diet has not been detailed but includes insects and probably spiders. It forages singly, in pairs, and in family groups, and often as a member of a mixed-species feeding flock. It typically feeds up 30 m (100 ft) above the ground in tall forest but as low as 3 m (10 ft) in stunted forest. It forages mostly at the ends of leafy branches and in the crown of trees. It forages actively and methodically, and usually captures prey by gleaning from leaves, stems, and vines by reaching and sometimes lunging from a perch. It sometimes makes short salllies to hover-glean. It is not known to follow army ants.<p>Nothing is known about the Roraima antwren's breeding biology.<p>The Roraiman antwren's song is a "very high, loud, fast, chipping series of about 12 notes, the last 3-4 descending and decelerating". Its calls include "very abrupt 'chup' notes" that are given singly or rapidly repeated a few times and a "slightly longer, downslurred 'tewp' " that also can be given in a rapid series.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
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Pseudocolopteryx acutipennis
A bright flycatcher found in marshes in the Andes from Colombia to Argentina. Yellow below and olive above, sometimes showing a hint of a dark mask and dull yellowish edges on the wing feathers. Distinctive in habitat, although could be confused with a female Masked Yellowthroat, which has a pinkish bill and legs. Forages singly or in pairs; can be difficult to see in dense marsh grasses. Mostly occurs from 1,000 to 3,500 m, but some appear to move into lowlands in the winter in southern part of range. Gives single nasal calls as well as a whirring noise produced by the wings.
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Rufous Hummingbird
Selasphorus rufus
Adult males are almost entirely orange with bright white chest and some green on the back (can be solid green like Allen's Hummingbird). Throat is iridescent, and depending on the light, can look anywhere from red to orange to yellow to lime green. On females and immatures, look for orange on sides and tail to separate from Anna's and Black-chinned. Found in a variety of wooded habitats; more common in migration in suburbs, meadows, and other brushier areas. Feeds on nectar and tiny insects.
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