Eurasian Curlew
Numenius arquata
Scimitar-billed large shorebird of varied open habitats. Note large size, overall brown plumage, and long, decurved bill (appreciably shorter on juvenile). In flight shows white back patch, mostly white underwings. Common call an onomatopoeic "coor-lee." Compare to smaller Whimbrel, which has head stripes, a piping whistled call, and Far Eastern Curlew, which has a buffy rump and extensively marked underwings. Breeds mainly in grasslands, from coastal marshes to upland moors; winters mainly in coastal lowlands, especially mudflats and adjacent marshes.
识别特征
The Eurasian curlew is the largest wader in its range, at 50–60 cm (20–24 in) in length, with an 89–106 cm (35–42 in) wingspan and a body weight of 410–1,360 g (0.90–3.00 lb). It is mainly greyish brown, with a white back, greyish-blue legs and a very long curved bill. Males and females look identical, but the bill is longest in the adult female. It is generally not possible to recognize the sex of a single Eurasian curlew, or even several ones, as there is much variation; telling male and female of a mated pair apart is usually possible however. The familiar call is a loud curloo-oo.<p>The only similar species over most of the curlew's range is the Eurasian whimbrel (Numenius phaeopus). The whimbrel is smaller and has a shorter bill with a kink rather than a smooth curve. Flying curlews may also resemble bar-tailed godwits (Limosa lapponica) in their winter plumages; however, the latter have a smaller body, a slightly upturned beak, and legs that do not reach far beyond their tail tips. The Eurasian curlew's feet are longer, forming a conspicuous "point".
分类信息
The Eurasian curlew was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Scolopax arquata. It is now placed with eight other curlews in the genus Numenius that was introduced by the French ornithologist Mathurin Jacques Brisson in 1760. The genus name Numenius is from Ancient Greek νουμήνιος, noumēnios, a bird mentioned by Hesychius. It is associated with the curlew because it appears to be derived from neos, "new" and mene "moon", referring to the crescent-shaped bill. The species name arquata is the Medieval Latin name for this bird, derived from Latin arcuatus, "bow-shaped", and again referring to the shape of the bill.<p>The English name "curlew" is imitative of the Eurasian curlew's call, but may have been influenced by the Old French corliu, "messenger", from courir , "to run". It was first recorded in 1377 in Langland's Piers Plowman "Fissch to lyue in þe flode..Þe corlue by kynde of þe eyre".<p>Three subspecies are recognised:
- 学名
- Numenius arquata
- 命名信息
- (Linnaeus, 1758)
- 目
- Charadriiformes
- 科
- Scolopacidae
- 属
- Numenius
分布与栖息地
The curlew exists as a migratory species over most of its range, wintering in Africa, southern Europe and south Asia. Occasionally a vagrant individual reaches places far from its normal range, such as Nova Scotia and the Marianas. It is present all year in the milder climates of Ireland and the United Kingdom and its adjacent European coasts.<p>Reclamation and drainage of marshy fields and moorland, and afforestation of the latter, have led to local decreases, while conversion of forest to grassland in some parts of Scandinavia has led to increases there.
- 繁殖区
- PAL : subarctic and temperate Palearctic wetlands, meadows: Faroe Is., British Is., Scandinavia s to s France, e through n Kazakhstan and (locally) n Mongolia to Transbaikalia (ne Russia), Inner Mongolia and Heilongjiang (ne China)
- 非繁殖区
- AF, OR : mainly subtropical to tropical coasts and larger rivers, Iceland, s British Isles, s Europe, Mediterranean, Africa, Malagasy region through Middle East, Indian subcontinent, se Asia, Indonesian Arch.; s, sc Japan, Korean Pen., se China, Taiwan and Philippines
- 迁徙
- Complete migrants
行为
The Eurasian curlew is generally wary. It is highly gregarious outside the breeding season.<p>The nest is a bare scrape on taiga, meadow, and similar habitats. The clutch size of the curlew consists of 4 eggs which are laid in April or May and incubates them for about a month until they begin to hatch. It has been observed that curlews tend to nest close to common kestrel's nests, as they can offer protection from other predators, such as corvids, even though kestrels also predate curlew nests.<p>The Eurasian curlew feeds by probing soft mud for small invertebrates, but will also pick small crabs and earthworms from the surface if the opportunity arises.<p>Eurasian curlews eggs are predated by foxes and predatory birds. In addition sheep have been recorded by the BBC nature series Springwatch predating the eggs.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Cerulean Warbler
Setophaga cerulea
Brilliant sky-blue warbler of the high canopy. Prefers mature deciduous forest, either in riparian areas or dry mountain ridge-tops. Tends to stay high in the canopy; thus, can be difficult to see blue color. From below, look for white throat and belly, thin necklace, and dark streaks on sides. Female is a unique muted turquoise with pale eyebrow and blurry streaks on sides. Immature birds show yellow wash on underparts. All plumages have bold white wingbars. Easiest to detect in spring and summer by its loud buzzy song, similar to Black-throated Blue but usually richer and more distinctly three-parted; much lower-pitched than Blackburnian Warbler. Winters primarily on the east slope of the Andes from Venezuela to Bolivia.
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Brown, aquatic bird with brilliant blue eyes. Tiny, stunted wings look almost comical and seem out-of-place on such a large bird. Endemic to Galápagos (where it is the only cormorant), and restricted to rocky coastlines of Isabela and Fernandina islands. Breeds throughout the year in small colonies. Often seen carrying large clumps of seaweed, which it uses to build its nest.
Brown Snake-Eagle
Circaetus cinereus
A medium-sized, brown eagle with yellow eyes, a large angular head, pale legs, and a brown-and-white-banded tail. In flight, the brown-and-silver underwing pattern is distinctive. It is sedentary and nomadic in savanna, plains, and semi-desert, where it mostly hunts snakes from perches, but it also eats other vertebrates. Immatures could be confused with immature Black-breasted Snake-Eagles, but the latter are rufous--not brown--and have a different underwing pattern.
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