Least Tern
Sternula antillarum
Tiny tern with quick flicking wingbeats. A real beach bum, rarely straying far from sand, both on the coast and along inland rivers and lakes. Breeding adults have yellow bill, stumpy yellow feet, white forehead, and black cap. Nonbreeding and immatures have a black bill, blackish nape, and dark shoulder bar, but still always identifiable by size and quick wingbeats. Often seen with other terns. Listen for shrill high-pitched calls.
识别特征
The least tern (Sternula antillarum) is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America. It is a small tern, 22–24 cm (8.7–9.4 in) long, with a wingspan of 50 cm (20 in), and weighing 39–52 g (1.4–1.8 oz). The upper parts are a fairly uniform pale gray, and the underparts white. The head is white, with a black cap and line through the eye to the base of the bill, and a small white forehead patch above the bill; in winter, the white forehead is more extensive, with a smaller and less sharply defined black cap. The bill is yellow with a small black tip in summer, all blackish in winter. The legs are yellowish. The wings are mostly pale gray, but with conspicuous black markings on their outermost primaries. It flies over water with fast, jerky wingbeats and a distinctive hunchback appearance, with the bill pointing slightly downward. It is migratory, wintering in Central America, the Caribbean and northern South America. Many spend their whole first year in their wintering area. It has occurred as a vagrant to Europe, with one record in Great Britain and one in Ireland. It differs from the little tern mainly in that its rump and tail are gray, not white, and it has a different, more squeaking call; from the yellow-billed tern in being paler gray above and having a black tip to the bill; and from the Peruvian tern in being paler gray above and white (not pale gray) below and having a shorter black tip to the bill.
分类信息
Genus: Sternula; Family: Laridae; Order: Charadriiformes.
- 学名
- Sternula antillarum
- 命名信息
- Lesson, RP, 1847
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Sternula
分布与栖息地
Breeding range: NA, MA : Great Plains to Texas and n Louisiana; c California and Gulf of California coasts to Oaxaca (w Mexico), El Salvador and Nicaragua; w North Atlantic coast from Maine to Florida, Gulf of Mexico and Caribbean Sea from Bahamas to Lesser Antilles, islands off Yucatan Pen., Belize and n Honduras, and islands n of Venezuela. Non-breeding range: n SA coast.
- 繁殖区
- NA, MA : Great Plains to Texas and n Louisiana; c California and Gulf of California coasts to Oaxaca (w Mexico), El Salvador and Nicaragua; w North Atlantic coast from Maine to Florida, Gulf of Mexico and Caribbean Sea from Bahamas to Lesser Antilles, islands off Yucatan Pen., Belize and n Honduras, and islands n of Venezuela
- 非繁殖区
- n SA coast
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Black Cicadabird
Edolisoma melas
A medium-sized bird of foothill and lowland forest canopy. Male is all black, and female has brown upperparts, orange-brown underparts and a paler brow. Several starlings are black but have a different shape and behaviour. Black Pitohui is usually at higher elevations and has a thicker, hooked bill. Female similar to female Gray-headed Cicadabird but lacks black in the wing and tail. Also similar to Rusty, some races of Northern Variable Pitohui and Piping Bellbird, but has a pale brow. Voice, a long downward whistle and a rapid, repeated “wek-wek-wek…”.
Eurasian Tree Sparrow
Passer montanus
This common Eurasian species is a close relative of the House Sparrow. Slightly smaller than House Sparrow with entirely rufous cap, black and white cheek, and limited black in the throat. Males and females are similar. Typically found in noisy small flocks, often in more natural areas than concrete-loving House Sparrow; calls are often higher-pitched than those of House Sparrow, and has a slightly slower chatter. Feeds on seeds. Introduced to a small region in the central U.S. and southeast Australia.
Crow-billed Drongo
Dicrurus annectens
Large dark drongo of open forested environments. Glossy black with a characteristically forked tail. Immature speckled with grayish-white on lower breast and belly. Thick dark bill gives a generally heavier-headed appearance than other similar dark drongos such as Black Drongo, with which it shares parts of its range; also prefers more forested environments than the latter. Aggressive and territorial, particularly during the breeding season, frequently mobbing raptors and corvids with great vigor. Like other drongos, boasts a varied repertoire; songs include a ringing “tsee-goo-gohgee!” Calls include bell-like gurgling notes, harsh chattering, and piercing whistles.
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