Streak-crowned Antvireo
Dysithamnus striaticeps
This plump little forest bird has a large head and short tail. Not striking, but distinctive in limited range. Male grayer, female browner. Look for small white spots on wing and faint streaks on throat and chest. Both sexes have streaked crown, although male is gray and female is rufous. Often seen following a mixed-species flock; sticks to the lower levels in the forest.
识别特征
The streak-crowned antvireo is 10 to 11 cm (3.9 to 4.3 in) long and weighs 15 to 17 g (0.53 to 0.60 oz). Adult males have a dark gray forehead, crown, and nape with heavy grayish white streaking. Their ear coverts are blackish. Their upperparts are grayish olive with a hidden white patch between the scapulars. Their flight feathers are dark grayish olive with wide buffy grayish edges; their wing coverts are blackish with white tips. Their tail is dark grayish olive with narrow white tips on the feathers. Their throat and breast are white with prominent dark streaks, their sides olive-gray, their belly whitish, and their undertail coverts whitish with a yellowish tinge. Adult females have a rufous crown and nape with dark spots. Their wing coverts are less black than the male's and their breast and flanks are ochraceous. Subadult males resemble adult females but with grayer upperparts and whiter underparts.
分类信息
The streak-crowned antvireo is monotypic. It and the spot-crowned antvireo (D. puncticeps) are closely related and may form a superspecies.
- 学名
- Dysithamnus striaticeps
- 命名信息
- Lawrence, 1865
- 目
- Passeriformes
- 科
- Thamnophilidae
- 属
- Dysithamnus
分布与栖息地
The streak-crowned antvireo is found from extreme southeastern Honduras along the Caribbean slope through Nicaragua and most of Costa Rica, and also across northern Costa Rica into Guanacaste Province. It primarily inhabits the understorey to mid-storey of evergreen forest in the lowlands and foothills, and much less frequently is found in mature secondary forest. In elevation it ranges from sea level to 400 m (1,300 ft) in Honduras and to 800 m (2,600 ft) in Nicaragua and Costa Rica.
- 迁徙
- Resident species
行为
The streak-crowned antvireo is thought to be a year-round resident throughout its range.<p>The streak-crowned antvireo feeds mostly on insects and its diet also includes other arthropods like spiders. It usually forages singly or in pairs, and usually as part of a mixed-species feeding flock. It typically feeds between about 1.5 and 8 m (5 and 25 ft) above the ground. It feeds deliberately, generally by gleaning while perched from live foliage, vines, stems, and thin branches. It often makes short sallies to hover-glean or to snatch prey from overhanging leaves.<p>The streak-crowned antvireo breeds between March and June in Costa Rica; its season elsewhere has not been defined. It makes a cup nest, usually of fibers from the stem of a fern with moss on the outside; tendrils of moss may dangle below the cup. It usually is suspended in the fork of a branch between about 1.5 and 4 m (5 and 15 ft) above the ground. The clutch is two eggs. The incubation period is at least 14 days; the time to fledging is not known. Both parents incubate the clutch and brood and provision nestlings.<p>The streak-crowned antvireo's song is "a long...series in which notes initially rise in pitch and intensity, remain constant, then gradually shorten, weaken and descend in pitch". It has been written as "kepkepkepkepkepkrrrrrrr" and "peu-peu-peu-Peu-Peu-Peu-Pip-Pip-Pip-Pip'Pip'Pip'Pip'Pip'peu". Its calls include "soft single or double whistles" and a "short 'chirr' ".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Wilkins's Finch
Nesospiza wilkinsi
A chunky olive-yellow finch with a hefty grosbeak-like bill. Male typically has a paler base to the bill and female is smaller, duller, and streakier. Uncommon, preferring wooded portions of Nightingale Island, to which it is endemic. Sings a repeated “whut-preeu,” deeper and slower than the song of Nightingale Island Finch; female answers with a whistle. The much smaller and commoner Nightingale Island Finch has a thinner, daintier bill than Wilkins’s and occurs throughout the island.
Frill-necked Monarch
Arses lorealis
Small black-and-white flycatcher found in wetter forests of northern Cape York. Completely white underparts, with black mask, tail, and wings, blue eyering, and back back with white band. Rear of head has large puffy white collar (like a space helmet). Compare Pied Monarch, which has a broad black breast band. Forages treecreeper-style, moving up and down tree trunks looking for insects in the bark. Calls include repeated nasal buzzing sounds.
Dull-mantled Antbird
Sipia laemosticta
Medium-sized antbird with plump body and short tail. Gray body and brown back. Look for red eye and small white spots on shoulder. Female similar to male but slightly paler. Found inside forest, always close to the ground and usually in gullies near streams. Usually in pairs. Song is a good clue to its presence: listen for high, thin whistles, the first few higher and the last several dropping in pitch.
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