Southern Pochard
Netta erythrophthalma
Very dark-looking duck with a broad white wing band that is visible in flight. Males are mostly glossy black with chestnut wings and a pale gray bill. Females have a different head pattern with white at the bill base and a crescent behind the eye. Inhabits lakes and pools with abundant vegetation.
识别特征
The southern pochard (Netta erythrophthalma) is a species of duck, and a member of the genus Netta. There are two subspecies, the South American (southern) pochard N. e. erythrophthalma (Wied-Neuwied, 1833) and the African (southern) pochard N. e. brunnea (Eyton, 1838). The South American pochard has a fragmented range and is found from Colombia, Venezuela, Brazil, Ecuador, Peru, Bolivia and Argentina to Chile. Here it occurs in a wide variety of shallow fresh waters with submerged vegetation, from the lowlands up to 3,700 metres. The African pochard occurs from the Cape to the Ethiopian highlands on water bodies with or without emergent vegetation. They are suspected to have been strong migrants in the past but the construction of numerous farm dams seems to allow them a more sedentary lifestyle. They reach highest concentrations in Africa's central plateaus and in the south-western winter rainfall region.
分类信息
Two syntype specimens of Nyroca brunnea Eyton (Monogr. Anat., 1838, p.161., pl.23.), the African Southern Pochard, are held in the vertebrate zoology collections of National Museums Liverpool at World Museum, with accession numbers NML-VZ D832 (male adult) and NML-VZ D832a (female adult). The specimens were collected in South Africa and came to the Liverpool national collection via Thomas Campbell Eyton’s collection and the 13th Earl of Derby’s collection which was bequeathed to the city of Liverpool. There are two other syntype specimens, including NHMUK 1845.7.6.271, in the Natural History Museum at Tring.
- 学名
- Netta erythrophthalma
- 命名信息
- (Wied-Neuwied, M, 1833)
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Netta
分布与栖息地
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Gray-eyed Bulbul
Iole propinqua
Drab, undistinguished-looking bulbul. Predominantly gray-brown with a white throat and slight rufous tones on the wings and tail. Pale eye and unmarked head distinguish it from other plain brownish bulbuls within its range. Tends to be seen solitarily or in pairs but will occasionally join mixed flocks or forage in larger groups at fruiting trees. Unmusical; gives a loud, ringing nasal note, often repetitively.
Rough-legged Hawk
Buteo lagopus
Long-winged, northern raptor found in open areas like fields and marshes. Plumage variable; light morphs generally pale with dark belly and dark patches on "wrists." Dark morphs have brown or blackish body with finely banded tail and striking white flight feathers. Some birds intermediate. Hovers often, kestrel-like, flapping wings while looking down. Also perches at edges of tree branches and tops of trees, places larger hawks are too heavy to perch. Breeds in far northern tundra and moves south irregularly to winter in open fields and grasslands. Compare with other Buteo hawks, such as Red-tailed Hawk and Common Buzzard, where ranges overlap. Note size, small bill, shaggy feathers on legs, and long and narrow wings.
Rufous-winged Sparrow
Peucaea carpalis
Subtly marked sparrow with a poor name; "rufous wing" is restricted to a tiny, barely visible patch on the shoulder. Gray head and neck with peaked rufous crown and rufous eyeline. Stout pink bill. Sides are buff and unstreaked on adults. Back and wings are also buffy with fine markings. Paler throat is edged with thin dark lines. Primarily a Mexican species with very limited range in the U.S.; found in pairs or small flocks in brushy grasslands. Variable song usually composed of a few clear tinkling notes and trills.
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