Blue-gray Gnatcatcher
Polioptila caerulea
A tiny, long-tailed, thin-billed songbird. Soft blue-gray above and whitish below, with a thin white eyering. Breeding males have a black band across the forehead. Forages actively for insects, often actively twitching its long tail. Can be found singly or in pairs, sometimes with mixed flocks of other songbirds, especially during migration. Two populations: Eastern birds breed in deciduous woodlands, often near water; western birds typically breed in drier, brushier habitats. Winters from the southern U.S. to northern Central America. Compare with Black-tailed Gnatcatcher, especially the tail pattern from below: Blue-gray is mostly white, with very limited black. Also very similar to Black-capped Gnatcatcher on the wintering grounds in West Mexico; Blue-gray has a higher-pitched call.
识别特征
It is 10–13 cm (3.9–5.1 in) in length, 6.3 in (16 cm) in wingspan, and weighing only 5–7 g (0.18–0.25 oz). Adult males are blue-gray on the upperparts with white underparts, slender dark bill, and a long black tail edged in white. Females are less blue, while juveniles are greenish-gray. Both sexes have a white eye ring.
分类信息
- 学名
- Polioptila caerulea
- 命名信息
- (Linnaeus, 1766)
- 目
- Passeriformes
- 科
- Polioptilidae
- 属
- Polioptila
分布与栖息地
The blue-gray gnatcatcher's breeding habitat includes open deciduous woods and shrublands in southern Ontario, the eastern and southwestern United States, and Mexico. Though gnatcatcher species are common and increasing in number while expanding to the northeast,[full citation needed] it is the only one to breed in Eastern North America. They migrate to the southern United States, Mexico, northern Central America (Belize, Guatemala, and Honduras), Cuba, the Bahamas, the Turks and Caicos Islands, and the Cayman Islands.
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- rising
照片
分布
鸟叫声
其他鸟类
Mindanao Pygmy-Babbler
Dasycrotapha plateni
A small bird of lowland and foothill forest and more open wooded areas on Mindanao. Reddish-brown on the upperparts and chest with a blackish face. Has fine white streaking on the head, back, and chest, a whitish belly, a pale yellow eye, and a thin black bill. Often joins mixed-species flocks and sometimes hangs upside down while feeding. Somewhat similar to Brown Tit-Babbler, but smaller, with a dark throat and chest streaked white. Voice consists of jumbled twittering.
Western Long-tailed Hornbill
Horizocerus albocristatus
A small-bodied hornbill with an extremely long tail, a dark bill, and an almost entirely white head with a unique crest. Usually found in thick rainforest, where it can be difficult to view. At times, these birds will follow troops of monkeys to eat animals they scare out of the foliage. Vocalizations are unique among African hornbills, including crowlike caws and long mournful wails. Calls can be similar to those of Congo Serpent-Eagle, but White-crested Hornbill often gives more of a wail with a somewhat raspy quality.
Orange-tufted Spiderhunter
Arachnothera flammifera
A fairly small bird of lowland and foothill forest understory and edge with a very long curved bill. Has a preference for banana plants. Olive-green above, whitish to pale gray from the throat to the upper belly, and yellow on the lower belly and under the base of the tail. Note the small orange tufts on the sides. Voice includes a repeated “sweet-sweet-sweet!” or dry “tyup!”
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