Blue Dacnis
Dacnis cayana
Small active warblerlike tanager with sharply pointed bill. Male blue with thin black mask, black throat and back. Female also distinctive, body entirely lime green with mostly blue head. Usually seen in pairs or small groups in the canopy of lowland and foothill forests, edges, and secondary growth. Often follows mixed feeding flocks. Feeds on fruit.
识别特征
The blue dacnis is 12.7 cm long and weighs 13 g. Despite its alternative name, it is not a honeycreeper, which are longer-billed. The adult male is turquoise blue with a black around the eyes, and on the throat and back. The wings and tail are black, edged with turquoise. The female and immature are mainly green with a blue head, paler green underparts and green-edged brown wings. The blue dacnis's call is a thin tsip.
分类信息
In 1760, the French zoologist Mathurin Jacques Brisson included a description of the blue dacnis in his Ornithologie based on a specimen collected in Cayenne in French Guiana. He used the French name Le Pepit bleu de Cayenne and the Latin name Sylvia cayanensis caerulea. Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. When in 1766 the Swedish naturalist Carl Linnaeus updated his Systema Naturae for the twelfth edition he added 240 species that had been previously described by Brisson. One of these was the blue dacnis. Linnaeus included a terse description, coined the binomial name Motacilla cayana and cited Brisson's work. The specific name cayana is from Cayenne. This species is now placed in the genus Dacnis that was introduced in 1816 by the French naturalist Georges Cuvier with the blue dacnis as the type species.<p>Eight subspecies are recognised:<p>The purplish honeycreeper (Chlorophanes purpurascens), a bird from Venezuela known only from the type specimen, is considered to be an intergeneric hybrid between the green honeycreeper and either the red-legged honeycreeper or the blue dacnis.
- 学名
- Dacnis cayana
- 命名信息
- (Linnaeus, 1766)
- 目
- Passeriformes
- 科
- Thraupidae
- 属
- Dacnis
分布与栖息地
The blue dacnis occurs in forests and other woodlands, including gardens and parks.
- 迁徙
- Resident species
行为
The bulky cup nest is built in a tree and the normal clutch is of two to three grey-blotched whitish eggs. The female incubates the eggs, but is fed by the male.<p>These are social birds which eat mainly insects gleaned from foliage, flowers or bromeliads. Fruit (such as licorice, Cecropia, Clusia, Miconia, berries, figs and bananas) is often taken and usually swallowed whole, but nectar is rarely consumed.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Azure-crowned Hummingbird
Saucerottia cyanocephala
Medium-sized hummingbird of oak and pine-oak woodlands and adjacent shrubby clearings; also local in lowland pine savannas. Sexes look alike and often look rather dull overall, despite the name. Note the whitish throat and breast offset by a dusky vest, and the dusky brownish rump and tail. Crown and sides of head are blue (rarely catching the light), with a white spot behind the eye and some red at base of bill.
Gray-crowned Palm-Tanager
Phaenicophilus poliocephalus
A woodland species that also ventures into parks and gardens. Often found in groups of up to five foraging at middle to upper heights and uncommonly joins mixed-species flocks. Note this species’ black cheek, which is bordered below by broad white moustache stripes and above by a gray crown. The similar Black-crowned Palm-Tanager has an entirely white throat and a black crown. Vocalizations are poorly known, but include a high thin “tseeoo” that is briefer than similar note of Black-crowned.
Andaman Boobook
Ninox affinis
A compact owl with brownish face and upperparts. Note the bold, rust-colored streaks running down the underparts. The vent is usually white, and the tail has bars running across it. Relatively shy, active outside daylight hours in well-wooded areas. The call is a distinctive low and resonant guttural “kroooo.”
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