Blue-mantled Thornbill
Chalcostigma stanleyi
Very dark hummingbird with a long tail and a short straight bill. Dark brownish overall with a steely-blue iridescence on the back and tail. The iridescent green-and-pink throat patch is only visible at some angles. Occurs at very high elevations from Ecuador to Bolivia, especially at the edge of Polylepis woodlands and other shrubby areas above 3,600 m. Occasionally feeds from flowers on the ground, but more often seen perched atop a shrub. Few other hummingbirds occur at such high elevations, so this thornbill is unlikely to be confused.
识别特征
The blue-mantled thornbill is 12 to 13 cm (4.7 to 5.1 in) long; males weigh about 6.2 g (0.22 oz) and females 4.5 g (0.16 oz). Both sexes have a short straight black bill and a small white spot behind the eye. Adult males of the nominate subspecies are generally dark sooty brown. The crown and nape have a bronzy green sheen, the back reflects violet-blue, and the uppertail coverts are turquoise. The forked tail is steel blue. They have a narrow gorget that is emerald green on the chin and transitions through pink to purple-violet or violet-blue at the lower edge. Adult females are similar, but the gorget has only the green under the chin and the outer tail feathers have pale tips. Juveniles resemble the adult female.<p>Subspecies C. s. versigulare's entire upperparts (not just the back) reflect deep violet-blue, and the lower pink to violet of the gorget is narrower than in the nominate. C. s. vulcani is similar to versigulare but the lower part of its gorget becomes blue-gray or gray-violet.
分类信息
The taxonomy of genus Chalcostigma is unsettled. The South American Classification Committee (SACC) of the American Ornithological Society is considering a proposal to merge the genus into Oxypogon. The blue-mantled thornbill has three recognized subspecies, the nominate C. s. stanleyi (Bourcier, 1851), C. s. versigulare (Zimmer, 1924), and C. s. vulcani (Gould, 1852).
- 学名
- Chalcostigma stanleyi
- 命名信息
- (Bourcier, 1851)
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Chalcostigma
分布与栖息地
The nominate subspecies of blue-mantled thornbill is found on both slopes of the Andes of Ecuador between the departments of Carchi and Azauy. C. s. versigulare is found on the Peruvian Andes' east slope from east of the Marañón River south to the Cordillera Carpish in Huánuco Department and also in the Cordillera Blanca on the west slope. C. s. vulcani is found on the eastern Andean slope from southern Peru to Cochabamba Department in central Bolivia.<p>The blue-mantled thornbill inhabits steep, rocky slopes with somewhat humid páramo grasslands and jalca vegetation. Within those landscapes it favors patches of Polylepis and Gynoxys woodland. In elevation it generally occurs between 3,000 and 4,200 m (9,800 and 13,800 ft) but has been recorded as low as 2,200 m (7,200 ft) and as high as 4,500 m (14,800 ft).
- 迁徙
- Vertical migration
行为
The blue-mantled thornbill is known to temporarily move to lower elevations during periods of harsh weather, so it is hypothesized to also make seasonal elevational migration.<p>The blue-mantled thornbill feeds on the nectar of small flowers such as Berberis, Gaultheria, Ribes, and Gentiana. It defends feeding territories. It has been observed gleaning tiny insects from the underside of Gynoxys leaves while clinging to them. It also picks insects from matted grass or rocks by hopping among them, and occasionally sallies to take insects on the wing.<p>The blue-mantled thornbill is believed to breed during the rainy season. As is typical of hummingbirds, the female alone incubates the two white eggs. Nothing else has been documented about its breeding phenology.<p>The blue-mantled thornbill's calls have been described as "a descending squeaky twitter followed by a mellower upslurred note" and "a downslurred 'tseetsitsitsitsitr-whee-tsew' [with] variations."
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Black-headed Cuckooshrike
Lalage melanoptera
Male has dark slaty-gray head, neck, and upper breast; rest of the body is pale gray, with white on the belly. Wings darker than mantle. Female lacks the black hood, and has a whitish supercilium, brownish-gray upperparts with lightly barred back and rump, and buff-white underparts with wide brown bars. Juvenile is similar to female, but upperparts barred white. Immature similar to female. Song is a series of clear, loud whistles: “pee-pe-pe-pe-pe-twe-twee.” Some notes can be omitted, or additional notes added.
Yellow-headed Amazon
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Scarce and local large green parrot of tropical lowland savannas and semiopen areas with forest patches and big trees (but often seen in cages). Like many parrots, usually seen in pairs, not mixing with other species. The head of Mexican birds has extensive yellow (less so on immatures) and the bill is pale. Birds in Belize and Honduras have less yellow on the head. This species is often trapped for the pet trade, which means it has been eliminated from much of its historic range.
Olive-backed Tanager
Mitrospingus oleagineus
A bulky bird of tepui highlands, often encountered in groups. Unlikely to be confused within its limited range; plumage mostly coppery-olive (may tend toward yellow in sunlight) with a contrasting gray face and throat. Stout bill is silvery gray. Occurs in canopy of tepui highland forest, generally above 800 m, where groups forage noisily through vegetation, probing into epiphytes and dead leaves and hopping clumsily along branches, eating whatever is in their path. Frequents fruiting trees, and may join mixed-species flocks but are just as likely to be found away from them. Most typical call is a dreadful high-pitched screech, modulated as if the bird is being squeezed, and sounding quite literally like fingernails on a chalkboard.
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