Scissor-tailed Flycatcher
Tyrannus forficatus
Large flycatcher with an extremely long, forked tail. Pale gray overall with darker wings and a salmon-colored wash on the belly. In flight, look for brighter salmon underwings. Juveniles are duller and shorter-tailed than adults, but still distinctive. Breeds in open country of Texas and neighboring states, where it is often seen on fenceposts and utility wires. Winters mainly on the Pacific coast of Mexico and Central America, where it sometimes gathers in large flocks. Might be confused with Fork-tailed Flycatcher in winter range, but note paler plumage with salmon underwings.
识别特征
Adult birds have pale gray heads and upper parts, light underparts, salmon-pink flanks and undertail coverts, and dark gray wings. Axillars and patch on underwing coverts are red. Their extremely long, forked tails, which are black on top and white on the underside, are characteristic and unmistakable. At maturity, the male may be up to 15 in (38 cm) in length, while the female's tail is up to 30% shorter. The wingspan is 15 cm (5.9 in) and the weight is up to 43 g (1.5 oz). Immature birds are duller in color and have shorter tails. A lot of these birds have been reported to be more than 40 cm (16 in).[citation needed]
分类信息
The scissor-tailed flycatcher 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 flycatchers in the genus Muscicapa and coined the binomial name Muscicapa forficata. The specific epithet is from Latin forfex, forficis meaning "a pair of scissors". Gmelin based his description on "Le moucherolle à queue fourchue du Mexique" (French: "the Mexican swallow-tailed flycatcher") that had been described in 1778 by the French polymath Comte de Buffon from a specimen from Mexico and illustrated with a hand-coloured engraving by François-Nicolas Martinet. The scissor-tailed flycatcher is now one of 13 species placed in the kingbird genus Tyrannus that was introduced in 1799 by Bernard Germain de Lacépède. The species is monotypic: no subspecies are recognised. <p>Within the genus Tyrannus, the scissor-tailed flycatcher is most closely related to the western kingbird (Tyrannus verticalis). In eastern Arkansas and western Tennessee, there is a hybrid breeding zone where the scissor-tailed flycatcher and the western kingbird are sympatric and possibly compete for the same niche. Both these species have simultaneously expanded their breeding ranges eastward over the past 50 years.
- 学名
- Tyrannus forficatus
- 命名信息
- (Gmelin, JF, 1789)
- 目
- Passeriformes
- 科
- Tyrannidae
- 属
- Tyrannus
分布与栖息地
Their breeding habitat is open shrubby country with scattered trees in the south-central states of Texas, Oklahoma, Kansas, western portions of Louisiana, Arkansas, and Missouri west to far eastern New Mexico and northeastern Mexico. Reported sightings record occasional stray visitors as far north as southern Canada and Upstate New York, as far east as Florida and Georgia, and in the West Indies. They migrate through Texas and eastern Mexico to their winter non-breeding range, from southern Mexico to Panama. Pre-migratory roosts and flocks flying south may contain as many as 1000 birds.
- 繁殖区
- NA : c USA to ne Mexico
- 非繁殖区
- w Mexico to Panama
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Least Auklet
Aethia pusilla
An abundant tiny auklet, only slightly larger than a sparrow. Occurs in large colonies around rocky shores during summer, and in smaller flocks further from the coast during winter. Summer plumage appears messy with numerous gray spots around the belly. Winter plumage is more contrastingly marked with flashing white belly and shoulders. Gives frequent, consistent squawks and squeaks at colonies. Readily separable from other auklets due to its whiter plumage and smaller size.
Gray-sided Flowerpecker
Dicaeum celebicum
A tiny, stubby, plump dark songbird with a bold red throat in males. Female is nondescript, all gray with a clean white throat. Juveniles resemble female but have a pale-based bill and a green-washed breast. Singles and pairs can be found in lowlands and foothills in a variety of habitats, including forest, forest edge, scrub, and gardens. Male can be separated from male Crimson-crowned Flowerpecker by red throat and lack of red crown. Female Gray-sided differs from female Crimson-crowned in absence of red rump. Song is a thin, high-pitched “see-se-sooo.” Also gives a buzzy “tzjit” note.
Cook's Petrel
Pterodroma cookii
A small, fast-flying petrel with long narrow wings and bright white underparts. Found singly or in loose aggregations, well offshore in warmer Pacific waters, mainly from March to August. Flight varies from low and weaving, into the wind, to high and arcing across the wind. Note gray cap and upperparts with dark M pattern across upperwings and dark tail tip. Underparts are white with very narrow black margins to wings. Many birds off Mexican coast are in wing molt.
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