Yellow-billed Duck
Anas undulata
A brown duck with a vividly yellow bill and white scalloping on the feathers, giving it a scaly appearance, especially on the underparts. A common resident and nomad through Africa’s freshwater and brackish wetlands, where it forages for plants and invertebrates. The similar African Black Duck differs from Yellow-billed Duck by being darker overall and having white spots on the upperparts, a bull-neck, and a pale-pink-and-black bill.
识别特征
These are mallard-sized mainly grey ducks with a darker head and bright yellow bill. The wings are whitish below, and from above show a white-bordered green speculum. Sexes are similar, and juveniles are slightly duller than adults. The north-eastern race is darker and has a brighter bill and blue speculum.<p>It is a bird of freshwater habitats in fairly open country and feeds by dabbling for plant food mainly in the evening or at night. It nests on the ground in dense vegetation near water. Rarely, it is found in suburban areas, in close proximity to golf courses, parks and lakes or dams. The clutch numbers between six and twelve eggs.<p>The male has a teal-like whistle, whereas the female has a mallard-like quack.<p>There are two subspecies of the yellow-billed duck: A. undulata rueppelli (northern yellow-billed duck) and A. undulata undulata (southern yellow-billed duck). The yellow-billed duck is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies. The southern nominate subspecies is declining due to competition and hybridization with feral mallards (Rhymer 2006).
分类信息
Genus: Anas; Family: Anatidae; Order: Anseriformes.
- 学名
- Anas undulata
- 命名信息
- Dubois, CF, 1838
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Anas
分布与栖息地
- 迁徙
- Nomadic
行为
Migration pattern: Nomadic.
保护状况
Population trend: stable.
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类

Jackson's Spurfowl
Pternistis jacksoni
Large, chunky brown francolin with a red bill, red legs, and bare red skin around the eye. Found in montane forest, forest edge, moorland, and grassland. Often in pairs or small groups that are often quite approachable. The common vocalization is a series of loud, rough “skraa” notes. Similar to Scaly Francolin, but larger and richer brown, with red bare skin around the eye.

Delicate Prinia
Prinia lepida
Tiny, disproportionately long-tailed, active, and vocal. The upperparts are gray-brown with heavy dark streaking, the underparts are pale, and each tail feather shows both pale and dark tips. Generally found in rather moist habitats within arid zones, including field margins, riparian woodland, scrub, gardens, and wetlands; can be quite numerous. Very vocal, especially in spring. The song is a rattling series of dry chirps, subtly different from the slower-paced song of Graceful Prinia. Males often sing from obvious perches. Visually extremely similar to Graceful Prinia, but there is little overlap in range. In any areas of overlap, best separated by song, but Delicate is also slightly longer- and narrower-tailed and browner.

Eastern Yellow-billed Barbet
Trachylaemus purpuratus
A large brightly colored barbet of forests and forest edges. Distinctive with its bright yellow bill and eye ring, dark head, back, and tail, and bright yellow belly with dark patches along the sides. Found in rainforest and lower montane forest, usually in the understory, and especially in treefall gaps, and along forest edges. Voice consists of a low “oop” or “op-oop” given in slow succession, sometimes for several minutes.
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