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
Social monogamous, extra-pair fertilizations, intraspecific parasitism, and quasi-parasitism are commonly found. During the breeding season, males defend small territories, about 13,0 - 72,5 m2, dominant males are normally lighter. The male has a jumping display, often performed for long periods, which gives rise to the local name "johnny jump-up". This is accompanied by a persistent wheezing jweeee call, jumping several times in a minute. The extravagant display also has a cost of calling attention of the predator, thus displaying increased nest predation. Predation is the main cause of breeding failure, and predator vocalizations can cause an immune-related reaction to this species. Nests are small cups of rootlets (diameter about 7.5 cm) found in herbaceous vegetation 10–50 cm high, clustered at a landscape, and placed preferably at high complex habitat spots. Nests are built by both sexes.<p>Blue-black grassquits will often form flocks when not breeding. They eat seeds, mostly on the ground.
保护状况
- 种群趋势
- rising
照片
分布
鸟叫声
其他鸟类
Hooded Crane
Grus monacha
A small, somber-colored crane of expansive agricultural fields and wetlands. Rare outside of its main wintering grounds in southern Japan, western Korea, and eastern China, where it gathers in small family units as well as massive flocks. Adults have dark gray bodies, a white head and neck, and a dark red forehead. Juveniles are similar but have a brown-tinged head and neck and a dark smudge on the forehead instead of a red patch.
Yellow-browed Antbird
Hypocnemis hypoxantha
Rather small antbird with a disjunct distribution. Males have a yellow face and underparts with a black crown, eye-line, and streaks on the breast. Females have a yellow streaked crown. Southeastern subspecies has ochraceous lower underparts. Song is a descending and decelerating series of fluted notes becoming harsher at the end. Found in the understory of humid forests, often in areas of transitional forest or poor soils. Rarely accompanies mixed-species flocks. The similar Spix's and Peruvian Warbling-Antbirds have white breasts, and the song of Peruvian is somewhat slower-paced.
Greater Bird-of-Paradise
Paradisaea apoda
A large bird of lowland and foothill forest and edge. Male has a black breast and white and yellow plumes which he raises above his back during his display, in which he variably hops about and flaps his wings, then holds them out still. May overlap slightly with Lesser and Emperor birds-of-paradise but male Greater is larger and lacks a yellow back. Female Greater is distinguished from other species by its all brown body. Male gives a typical, repeated nasal squawk.
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