Red-billed Duck
Anas erythrorhyncha
This small duck has a solidly chocolate-brown ‘skull cap’, white cheeks, and a distinctive pink-red bill with a dark saddle. In flight, the buff flight feathers with a black stripe are distinctive on otherwise all-brown wings. It prefers foraging on open fresh water, with seeds and plant matter forming the majority of its diet. The similar Blue-billed Teal differs from Red-billed Duck by being smaller and having a silvery-blue bill and dark smudges on the cheeks. Cape Teal and Bernier’s Teal (the latter endemic to Madagascar) both lack the strongly contrasting face pattern of Red-billed Duck.
识别特征
The red-billed teal is 43–48 centimetres (17–19 in) long and has a blackish cap and nape, contrasting pale face, and bright red bill. The body plumage is a dull dark brown scalloped with white. Flight reveals that the secondary flight feathers are buff with a black stripe across them. The sexes are similar, but juveniles are duller than adults.<p>This is a quiet species, but the displaying male has a whzzt call, whereas the female has a soft mallard-like quack.<p>The red-billed teal is a bird of freshwater habitats in fairly open country and is an omnivore. It feeds by dabbling for plant food, or foraging on land mainly in the evening or at night. It nests on the ground in dense vegetation near water.<p>This is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
分类信息
The red-billed teal 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 all the other ducks, geese and swans in the genus Anas and coined the binomial name Anas erythrorhyncha. Gmelin based his description on the "Crimson-billed duck" that had been described in 1785 by the English ornithologist John Latham in his A General Synopsis of Birds. Latham specied the type locality as the Cape of Good Hope. The genus name Anas is the Latin word for a duck. The specific epithet erythrorhyncha combines the Ancient Greek eruthros meaning "red" with rhunkhos meaning "bill". The species is monotypic: no subspecies are recognised.
- 学名
- Anas erythrorhyncha
- 命名信息
- Gmelin, JF, 1789
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Anas
分布与栖息地
- 迁徙
- Resident species
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Surucua Trogon
Trogon surrucura
Often draws attention to its presence by its song: an ascending sequence of “kwa” notes, similar to Green-backed Trogon, but faster. Two subspecies occur in Brazil, Paraguay, and northeastern Argentina with limited geographical overlap that vary in the color of the breast and eyering; the southern one has a red belly and eyering, while the northern one has a yellow belly and eyering. The males of both subspecies have a violet-blue head and breast, a green back, and a white undertail. Females have a dull gray breast and the undertail is gray with white tips. Found in the middle to upper levels of forests and woodlands.
Sooty Shearwater
Ardenna grisea
Medium-sized, dark brown shearwater with silvery flashes on underwings. Narrow wings with quick, deep wingbeats. Widespread and common, especially in the Pacific; can sometimes be seen close to shore. Can be in massive flocks. Extremely similar to Short-tailed Shearwater, but Sooty is heavier and has straighter wings; also look for slightly longer bill and less rounded head. Brown plumage is reminiscent of Flesh-footed Shearwater, but Sooty is narrower-winged and has a smaller, all-dark bill.
Blakiston's Fish-Owl
Ketupa blakistoni
Massive pale brown owl with plump, rounded ear tufts. An endangered species, found in mature boreal forests near streams where there are tree cavities suitable for nesting. Preys mostly on fish. Distinguished from Eurasian Eagle-Owl by absence of broad black streaks on breast and rounder, thicker ear tufts that are not held erect. Deep, resonant song, given in duet by pair. Duet consists of three notes, with the first two notes from a male and a third from a female. The lower-pitched female note partially overlaps with the second male note.
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