Eastern Whip-poor-will
Antrostomus vociferus
Cryptic night bird, more often heard than seen. Listen for namesake song, a whistled "whip-poor-WILL," repeated endlessly. Found in forests, often with a mixture of pines and deciduous trees with open areas nearby for foraging. Forages for flying insects from the ground at night. Intricately patterned with gray, brown, and black. Similar to Chuck-will's-widow but with smaller head and shorter wings and tail. Eastern and Mexican Whip-poor-wills were recently split into separate species; they differ mainly in voice and do not overlap in range.
识别特征
This medium-sized nightjar measures .mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .den{vertical-align:sub}.mw-parser-output .sr-only{border:0;clip:rect(0,0,0,0);clip-path:polygon(0px 0px,0px 0px,0px 0px);height:1px;margin:-1px;overflow:hidden;padding:0;position:absolute;width:1px}22–27 cm (8+1⁄2–10+1⁄2 in) in length, spans 45–50 cm (17+1⁄2–19+1⁄2 in) across the wings and weighs 42–69 g (1+1⁄2–2+7⁄16 oz). Further standard measurements are a wing chord of 14.7 to 16.9 cm (5+13⁄16 to 6+5⁄8 in), a tail of 10.5 to 12.8 cm (4+1⁄8 to 5+1⁄16 in), a bill of 1 to 1.4 cm (3⁄8 to 9⁄16 in) and a tarsus of 1.5 to 1.8 cm (9⁄16 to 11⁄16 in). Adults have mottled plumage: the upperparts are grey, black and brown; the lower parts are grey and black. They have a very short bill and a black throat. Males have a white patch below the throat and white tips on the outer tail feathers; in the female, these parts are light brown.<p>This bird is sometimes confused with the related chuck-will's-widow (Antrostomus carolinensis) which has a similar but lower-pitched and slower call.
分类信息
- 学名
- Antrostomus vociferus
- 命名信息
- (Wilson, A, 1812)
- 目
- Caprimulgiformes
- 科
- Caprimulgidae
- 属
- Antrostomus
分布与栖息地
- 繁殖区
- NA : sc, se Canada and ec, e USA
- 非繁殖区
- se USA and MA
- 迁徙
- Complete migrants
行为
Eastern whip-poor-wills breed in deciduous or mixed woods across central and southeastern Canada and the eastern United States, and migrate to the southeastern United States and to eastern Mexico and Central America for the winter. These birds forage at night, catching insects in flight, and normally sleep during the day. Eastern whip-poor-wills nest on the ground, in shaded locations among dead leaves, and usually lay two eggs at a time. The bird will commonly remain on the nest unless almost stepped upon.[citation needed]<p>The whip-poor-will has been split into two species. Eastern populations are now referred to as the eastern whip-poor-will. The disjunct population in southwestern United States and Mexico is now referred to as the Mexican whip-poor-will, Antrostomus arizonae. The two populations were split based on range, different vocalizations, different egg coloration, and DNA sequencing showing differentiation.
保护状况
The eastern whip-poor-will is currently in decline, though they remain fairly common. In 2017, the eastern whip-poor-will was uplisted from least concern to near threatened on the IUCN Red List on the basis of citizen science observations demonstrating a decline in populations of the eastern whip-poor-will by over 60% between 1970 and 2014. Several reasons for the decline are proposed, such as loss of early successional forest habitat related to fire suppression and habitat destruction, predation by feral cats and dogs, and poisoning by insecticides, but the actual causes remain elusive. Pesticides and intensified agriculture have led to declines in the flying insect populations that the eastern whip-poor-will depends on. BirdLife International has stated that initiatives like the Conservation Reserve Program will be crucial in conserving the species and reversing its decline.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Opal-rumped Tanager
Tangara velia
Common tanager, found in a variety of forest habitats. Usually seen from below, in which case it is best identified by uniform dark underparts with rufous lower belly and undertail coverts, and active behavior. The shining white rump can be seen from most angles on perched birds, even when high overhead. Found in tall rainforest, shorter-stature forests on sandy soils, and in disturbed areas. Groups move rapidly through treetops, usually with other species of small tanagers, feeding on fruit. Calls are indistinct chips, often given in rapid series in flight.
White-throated Kingfisher
Halcyon smyrnensis
Large-headed, predominantly brown kingfisher with electric-blue back and wings, heavy red bill, and snow-white patch from the throat through the breast. Common both near and away from water; frequently seen perched on fence posts and telephone lines near wetlands, lakes, agricultural fields, and clearings. Gives jarring, raptor-like descending trills and cackles, often in flight.
Brown Trembler
Cinclocerthia ruficauda
A bright-eyed, hefty billed bird of forests and scrublands. Tends to hold its tail cocked up and wings drooped, especially when feeding. Typically appears almost entirely warm brown; dark above and paler below with some gray on head. Gray Trembler lacks the brown hues of Brown Trembler and has some degree of white below. White-breasted Thrasher has largely bright white underparts and a dark red eye (not yellow as in Brown Trembler). Song is a slow jumble of rich whistles and high-pitched sibilant notes. Calls include scattered whistles and harsh scolding notes.
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