Blue-black Grassquit
Volatinia jacarina
Fairly common little bird of weedy and brushy fields, farmland, and other open grassy areas in tropical lowlands and foothills. Note the very small size, brown plumage, and streaky breast, plus the pointed conical bill. Male’s blue-black breeding plumage is worn only in the summer wet season; molting birds and immatures are patchy blue-black and brown. In song display, male leaps into the air from grass stalk or fence, uttering a short buzzy phrase, repeated over and over.
识别特征
Adult blue-black grassquits are 10.2 cm (4.0 in) long and weigh 9.3 g (0.33 oz). They have a slender conical black bill. The male is glossy blue-black, with a black tail and wings; the white inner underwing is visible in flight or display. Female and immature birds have brown upperparts and dark-streaked buff underparts.
分类信息
The blue-black grassquit was described by the Swedish naturalist Carl Linnaeus in 1766 in the twelfth edition of his Systema Naturae under the binomial name Tanagra jacarina. Linnaeus based his description on the "Jacarni" that was described in 1648 by the German naturalist Georg Marcgrave in his Historia Naturalis Brasiliae. The type locality is eastern Brazil. The specific epithet jacarina is derived from the Tupi language and was used for a type of finch. The blue-black grassquit is now the only species placed in the genus Volatinia and was introduced in 1850 by the German naturalist Ludwig Reichenbach. The genus name is a diminutive of the Latin volatus meaning "flying".<p>Within the tanager family Thraupidae the blue-black grassquit is in the subfamily Tachyphoninae and is a member of a clade that contains the genera Conothraupis and Creurgops.<p>The blue-black grassquit was formerly placed with the buntings in the subfamily Emberizinae rather than with the tanagers in Thraupinae within an expanded family Emberizidae.<p>Three subspecies are recognised:
- 学名
- Volatinia jacarina
- 命名信息
- (Linnaeus, 1766)
- 目
- Passeriformes
- 科
- Thraupidae
- 属
- Volatinia
分布与栖息地
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: rising.
- 种群趋势
- rising
照片
分布
鸟叫声
其他鸟类
White-throated Foliage-gleaner
Syndactyla roraimae
Small, rufous-brown bird of tepui highlands. Key mark is striking white throat contrasting sharply with unmarked brown underparts. Also note rufous tail and thin white line extending rearward from eye. Found only at higher elevations (above 1000 m) in humid forests of tepui region, where it is not particularly common and is usually seen with mixed-species flocks. Creeps over mossy branches, probes into epiphytes, and investigates dead leaves for insect prey. Distinctive vocalizations have a toneless, dry quality and are quite unlike any other species in range; call is a single hard note, sometimes doubled, whereas song is an accelerating dry rattle. At first glance could be mistaken for Roraiman Barbtail, which also has bright white throat; however, White-throated Foliage-gleaner is much larger and plainer.
Laysan Finch
Telespiza cantans
A finch-billed Hawaiian honeycreeper endemic to the island of Laysan; does not occur in the main Hawaiian Islands. An introduced population occurs on Pearl and Hermes Atoll. Unlikely to be confused with any other species; the only other passerine bird on Laysan is the Millerbird, which lacks the Laysan Finch’s heavy bill. Males have a bright yellow head. Females are paler yellow and streaked.
Sichuan Leaf Warbler
Phylloscopus forresti
Like most leaf warblers, it is a small, active bird and excruciatingly difficult to identify; likely to be seen fleetingly in the upper layers of the forest. Very similar in appearance to other “Pallas’s-type” leaf warblers in its range. Bleached-white crown stripe and predominantly white brow stripes distinguish this species from the much yellower Pallas’s Leaf Warbler. Sichuan lacks the white tail edges (visible in flight) of Buff-barred and Ashy-throated warblers. Appears nearly identical to Lemon-rumped Warbler but has a brighter yellow rump and averages darker olive-green above. Breeds in mid- to high-elevation coniferous and mixed forests, but descends into foothills in the winter. Song has two types, both of which are difficult to distinguish from those of Lemon-rumped Warbler, but they tend to be slower in their delivery. Calls are crisp notes, slower-sounding and longer than those of Lemon-rumped Warbler.
开始您的观鸟之旅
在户外识别鸟类，并在下一次观察时随手查阅鸟类图鉴。