Pacific Swallow
Hirundo javanica
Common swallow of Southeast Asia and the Pacific, often in cities and towns as well as above fields, lakes, and forests. Adult iridescent blue above and grayish buff below, with orangish throat and forehead. Similar to Barn Swallow, which has longer outer tail feathers and a dark line separating the throat and breast, lacking in Pacific. Frequently perches on telephone lines, often with other swallow species.
识别特征
This species is a small swallow at 13 cm (5.1 in) in length. It has a blue-black back and crown with browner wings and tail, a red face and throat, and dusky underparts. It differs from the barn swallow and the closely related welcome swallow in its shorter and less forked tail.
分类信息
The Pacific swallow was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the swallows in the genus Hirundo and coined the binomial name Hirundo tahitica. Gmelin based his entry on the "Otaheite swallow" that had been described and illustrated in 1783 by the English ornithologist John Latham in his book A General Synopsis of Birds.<p>Seven subspecies are recognised:
- 学名
- Hirundo javanica
- 命名信息
- Gmelin, JF, 1789
- 目
- Passeriformes
- 科
- Hirundinidae
- 属
- Hirundo
分布与栖息地
- 迁徙
- Resident species
行为
The Pacific swallow builds a neat cup-shaped nest, constructed with mud pellets collected in the beak, under a cliff ledge or on man-made structures such as a building, bridge or tunnel. The nest is lined with softer material, and the clutch is two to three eggs. It is similar in behaviour to other aerial insectivores, such as other swallows and the unrelated swifts. It is a fast flyer and feeds on insects, especially flies, while airborne.
保护状况
- 种群趋势
- unknown
照片
分布
鸟叫声
其他鸟类
Bay-breasted Warbler
Setophaga castanea
Breeding males are distinctive with dark reddish-brown cap and sides, along with buffy nape. Two bold white wingbars. Females and fall birds are duller; most show at least some chestnut coloring on sides. Dullest birds are similar to Blackpoll and Pine Warblers; look for streaks on back, well-defined wingbars, and cleaner greenish-yellow head and neck. Prefers conifers during migration, but can be found in any woodland. Breeds in the boreal forest. In most of U.S. , only seen during migration. Winters in Central and South America. Listen carefully for extremely high-pitched, squeaky-wheel song, similar to a fast Black-and-white Warbler.
Tourmaline Sunangel
Heliangelus exortis
Dark hummingbird with fairly short straight bill. Male has bright purple throat patch and blue-green forecrown. Female has white throat. Also note white undertail coverts and fairly long notched tail. Fairly common in high elevation forests and edges in the Andes of Colombia and Ecuador. Visits feeders.
Pale-billed Sicklebill
Drepanornis bruijnii
A large, long-billed bird of lowland forest. Brown upperparts with black head and grayish facial skin behind the eye. Note the curved, pale bill. Male has a black throat, sides and two small, hornlike tufts on the head. Female has pale underparts with dark barring. Similar to female Twelve-wired Bird-of-Paradise and Magnificent Riflebird, but female Pale-billed Sicklebill has a longer, thinner, more curved bill. One of several vocalizations, a descending series of low whistles, reminiscent of Common Potoo.
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