White-necked Raven
Corvus albicollis
Typical, heavy-billed raven, but with the unusual addition of a white wedge on the back of the neck. Flight is powerful and heavy; sometimes soars. Found in a variety of habitats in rocky or mountainous country. Usually in pairs or small flocks; feeds by walking along the ground. Call is a rough “krrraw.” Larger than Pied Crow, with a heavier bill and much less white. Similar to Thick-billed Raven, but shorter-tailed, smaller-billed, and with a more extensive white patch on the neck.
识别特征
The white-necked raven has a much shorter tail than the common raven, as well as a deeper bill with a white tip that is almost as strongly arched as that of the thick-billed raven. Though predominantly black, the throat, breast and neck show a faint purple gloss. There is a large patch of white feathers on the nape of the neck.<p>Soars well with shallower wingbeats than other Corvidae.<p>Often described as a raven with a sore throat, it has very similar calls to the common raven, but with a more husky note. It has a croak like the other raven species but with a more whispering note. Like all corvids, the White-necked raven is capable of vocal mimicry. However, this behavior is only ever recorded in captivity.
分类信息
- 学名
- Corvus albicollis
- 命名信息
- Latham, 1790
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Corvus
分布与栖息地
It occurs in eastern and southern Africa in open, mountainous country. It is quite commonly found in small towns and villages as long as there are mountains or hills for roosting and nesting relatively nearby.
- 迁徙
- Resident species
行为
Most of this bird's food is obtained from the ground, but it will take food from trees as well. It has been seen to drop a tortoise from a height on to hard ground, preferably on rocks, and then swoop down to eat it, or even pick it up again if not sufficiently broken. White-necked ravens will also readily take carrion from road kills. Fruit, grain, insects, small reptiles, peanuts and human food are also readily taken, and the bird forages in back yards and gardens quite openly. Like all or most raven species, White-necked ravens form flocks after leaving their parents and, once fully matured, will pair off and form territories. They are often found in the company of other scavengers such as kites or vultures.<p>Nests are bowls of sticks lined with grass, hair, and wool, built mainly on cliff ledges but occasionally found in trees. There are usually 3-5 eggs laid.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
New Zealand Bellbird
Anthornis melanura
A medium-sized nectar feeder endemic to New Zealand. Note yellowish-green plumage, blackish wings and tail, and red eyes. Male has purple tints on his head. Female browner, with a bluish gloss on the head. Juveniles show a clear yellowish cheek stripe. Widespread in the North and South Islands of New Zealand. Favors native and exotic forest, scrub, and urban parks and gardens. Listen for its melodious song consisting of a series of tuneful notes. Alarm call is a harsh, rapidly repeated “yeng.” Distinguished from European Greenfinch by lack of a pale, conical bill and larger size. Listen for lack of grunts, wheezes, and clicks to distinguish song from that of Tui.
Black-headed Bulbul
Microtarsus melanocephalos
Olive-yellow bulbul with a black head and unsettling sapphire eyes. Broad black band across the tail is especially noticeable when seen from below. No other bulbul in its range sports a crestless dark head, but look out for the slenderer and longer-billed leafbirds, whose dark throats may cause confusion when seen from below. Extremely rare gray morph replaces all yellow with gray, and intermediate birds have both yellow and gray patches. Inhabits broadleaf and mixed forests as well as edges, often in areas close to water. Usually seen in pairs or small flocks in the upper layers of lowland and foothill forest. Unlike many other bulbuls, not particularly vocal; gives occasional “chew” or “chep” notes, often while flying.
Yellow-headed Amazon
Amazona oratrix
Scarce and local large green parrot of tropical lowland savannas and semiopen areas with forest patches and big trees (but often seen in cages). Like many parrots, usually seen in pairs, not mixing with other species. The head of Mexican birds has extensive yellow (less so on immatures) and the bill is pale. Birds in Belize and Honduras have less yellow on the head. This species is often trapped for the pet trade, which means it has been eliminated from much of its historic range.
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