Yellow-green Vireo
Vireo flavoviridis
Fairly large vireo with a big bill and a pale eyebrow. Essentially the southern counterpart of Red-eyed Vireo. Breeds in tropical woodland and forest of Mexico and Central America, migrating south in September to South America (especially the western Amazon basin) and returning north again in March. Told from Red-eyed Vireo by its less contrasting head pattern, yellow sides and flanks, and brighter greenish upperparts. Monotonous song sounds like a House Sparrow that’s taken singing lessons.
识别特征
The adult yellow-green vireo is 14–14.7 cm in length and weighs 18.5 g. It has olive-green upperparts and a dusky-edged gray crown. There is a dark line from the bill to the red-brown eyes, and a white supercilium. The underparts are white with yellow breast sides and flanks. Young birds are duller with brown eyes, a brown tint to the back, and less yellow on the underparts. The adult yellow-green vireo differs from the red-eyed vireo in its much yellower underparts, lack of a black border to the duller gray crown, yellower upperparts and different eye color.<p>Some individuals are difficult to separate, even in the hand, from the similar red-eyed vireo, with which it is sometimes considered conspecific. Its exact status as a passage bird in countries such as Venezuela is therefore uncertain.<p>The yellow-green vireo has a nasal nyaaah call, and the song is a repetitive veree veer viree, fee’er vireo viree, shorter and faster than that of the red-eyed vireo. This species rarely sings on its wintering grounds.
分类信息
The yellow-green vireo was formally described by the American ornithologist John Cassin in 1851 under the binomial name Vireosylvia flavoviridis. The specific epithet combines the Latin flavus meaning "yellow" and viridis meaning "green". The type locality is San Juan de Nicaragua. The yellow-green vireo is now placed in the genus Vireo that was introduced in 1808 by the French ornithologist Louis Pierre Vieillot.<p>Five subspecies are recognised:
- 学名
- Vireo flavoviridis
- 命名信息
- (Cassin, 1851)
- 目
- Passeriformes
- 科
- Vireonidae
- 属
- Vireo
分布与栖息地
It breeds from southern Texas (occasionally the Rio Grande Valley) in the United States and the western and eastern mountain ranges of northern Mexico (the Sierra Madre Occidental and Sierra Madre Oriental—also the Cordillera Neovolcanica) south to central Panama. It is migratory, wintering in the northern and eastern Andes and the western Amazon basin. This vireo occurs in the canopy and middle levels of light woodland, the edges of forest, and gardens at altitudes from sea level to 1500 m.
- 繁殖区
- MA : widespread, also s Texas
- 非繁殖区
- SA
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Slaty Egret
Egretta vinaceigula
A small, dark egret with a rusty-buff throat and yellow-green legs and feet. It occurs solitarily or in small groups, preferring marshes and floodplains; it avoids open areas, seeking cover in small channels or near long grass. Slaty Egrets walk slowly, shuffling their feet to surprise fish and frogs. Although it is mostly resident, it can disperse widely outside of its core range. The similar Black Egret differs by having a dark throat, dark legs with yellow feet, and occasionally foraging in a distinctive “umbrella” position, whereby it covers its head with its wings.
Cameroon Indigobird
Vidua camerunensis
A nest parasite that lays its eggs in the nests of African and Black-bellied Firefinches and Brown and Dybowski's Twinspots. Breeding males are glossy black with blue iridescence and a pale brownish panel in the wings. Females and non-breeding males are streaky and brown on the back and pale below, with a bold facial pattern. The bill is whitish and the legs very pale purplish. Found locally in lush woodland, savanna, and cultivated areas. Given current knowledge, can only be confidently identified by mimicked vocalizations. Each male parasitizes only one of the four host species and imitates its vocalizations, often mixing them into a scratchy jumble of high-pitched notes.
Eurasian Wren
Troglodytes troglodytes
Tiny brown bird that often holds its short little tail cocked up. Often sings from a fairly exposed perch, but at other times rather mouselike, creeping in brambles and understory. As such, can be quite inconspicuous. Favors wooded areas with a dense understory, as well as gardens, hedges in farmland, heathland, and coastal cliffs. Heard much more than seen: song is loud, bright, and musical, a varied series of trills and ringing warbles, repeated. Chipping calls can also give away its presence.
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