White-throated Daggerbill
Schistes albogularis
Fairly small hummingbird found on the west slope of the Andes from central Colombia to southwestern Ecuador. Both sexes mostly green with short, straight bill. Males have green throat and crown with purplish patches on neck sides and a bold broken white collar. Females have white throat. Inconspicuous; look for singles at flower patches in understory of foothill and subtropical forest and edge, from around 800-2,000 m.
识别特征
The white-throated daggerbill is 8.6 to 9.3 cm (3.4 to 3.7 in) long and weighs 3.5 to 4.1 g (0.12 to 0.14 oz). It gets its name from the tip of its bill, which is very narrow and sharply pointed. Both sexes are generally green overall. Males have a shiny green forehead, violet-blue patches on the sides of the throat that can extend well up into the face, a white band across the upper chest, and a small white patch behind the eye. Females' foreheads are not shiny, the throat patches are smaller and mostly blue, and they have an unmarked white throat.
分类信息
The white-throated daggerbill has often been considered conspecific with what is now the only other member of its genus, Geoffroy's daggerbill (S. geoffroyi) under the name "wedge-billed hummingbird". The South American Classification Committee (SACC) of the American Ornithological Society split them in June 2018 and the International Ornithological Committee (IOC), the Clements taxonomy, and BirdLife International's Handbook of the Birds of the World (HBW) followed suit. Later all of them except HBW adopted the "daggerbill" English name; HBW uses the name "western wedge-billed hummingbird". Some authors have suggested that the genus be merged into that of the visorbearers, Augastes. The white-throated daggerbill is monotypic.
- 学名
- Schistes albogularis
- 命名信息
- Gould, 1852
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Schistes
分布与栖息地
The white-throated daggerbill is found from the western Andes and the west slope of the Central Andes of Colombia south into western Ecuador. It inhabits the interior and edges of dense cloudforest, often near streams. In elevation it ranges between 800 and 2,000 m (2,600 and 6,600 ft).
- 迁徙
- Resident species
行为
The white-throated daggerbill is mostly sedentary but makes some elevational dispersion after the breeding season.<p>The white-throated daggerbill forages in dense vegetation from near the ground to medium heights. It collects nectar from tubular flowers of a variety of shrubs, vines, and small trees and often "robs" nectar by piercing the base of a flower. It also captures small insects on the wing or sometimes by gleaning from vegetation.<p>Nothing is known about the white-throated daggerbill's breeding phenology.<p>The white-throated daggerbill's song is "a series of two different high-pitched notes repeated, 'tsit...seet...tsit...seet...', at an irregular pace".
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
White-crowned Hornbill
Berenicornis comatus
Eccentric-looking hornbill with a bushy, upright white crest and a white tail. Male is white from the head down to the belly; female is predominantly black, with only a white crest. Pale wing edges revealed only when in flight. Unlike many other hornbills in its range, forages primarily at lower levels in the forest, frequently descending down to the ground. Social; forages in flocks. Gives rather soothing, owl-like hooting coos.
Gray Tit-Flycatcher
Fraseria plumbea
A gray flycatcher that has a distinctive blackish tail with white outer tail feathers. It forages more like a warbler than a typical flycatcher, flitting through foliage searching carefully for insects; seldom sallies to catch flies. Often it leans forward with its tail slightly raised and spread, a behavior that may flush insects nearby. It forages unobtrusively in broadleaf woodland, thickets, and forest edge, where it is most often detected by its trembling, mournful “wheeely-wheerr” song. The similar Gray-throated Tit-Flycatcher prefers lowland rainforest and has an all-dark tail and a plain gray face, while Ashy Flycatcher has an all-dark tail and hunts by perching and sallying like a typical flycatcher.
Crowned Cormorant
Microcarbo coronatus
A small, plain-backed cormorant that is restricted to near-shore marine environments, where it is uncommon. Sometimes it occurs in coastal estuaries alongside the similar Long-tailed Cormorant, which has a shorter crest (year-round), a pale-speckled back, and a relatively longer tail. Nonbreeding and immature plumages are brownish with paler underparts. Frequently roosts on coastal rocks with other marine cormorants, which are larger and have blue or brownish eyes. Flies poorly on short, stubby wings; avoids the deeper marine waters frequented by Cape and Bank cormorants.
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