Fan-tailed Raven
Corvus rhipidurus
This medium-sized all-dark crow has a unique batlike silhouette. When perched the tail seems normally-proportioned, but in flight it tail appears extremely short. Bill is short and heavy. Lives on high desert cliffs. Extremely aerobatic and often in medium-sized groups. Gives a high-pitched croak.
识别特征
The fan-tailed raven is completely black including bill, legs and feet and the plumage has a purplish-blue gloss in good light. Worn plumage is slightly coppery-brown. The base of the feathers on the upper neck are white and only seen if the bird is inspected or a strong gust blows them the wrong way. The throat hackles are shorter than in most other ravens. One of the smaller raven species, it is about the same size or slightly larger than the carrion crow, at 47–51 cm, but with a much thicker bill, shorter tail and much larger wings.<p>The voice is described as guttural croaks mixed with the sound of frog-call. Like all corvids, the fan-tailed raven is capable of vocal mimicry; however, this behavior is mostly recorded in captivity and, very rarely, in the wild.
分类信息
- 学名
- Corvus rhipidurus
- 命名信息
- Hartert, EJO, 1918
- 目
- Passeriformes
- 科
- Corvidae
- 属
- Corvus
分布与栖息地
It occurs in the Middle East, North Africa, Arabia, and south to Sudan and Kenya. It also ranges across the Aïr Massif in the southern Sahara. It lives in desert or open dry country that includes crags for nesting. It is one of the most aerial of birds traveling huge distances in search of food, its large wings being adapted to gliding on thermals in a rather vulture-like way.
- 迁徙
- Resident species
行为
Food is invariably taken on the ground and includes all manner of insects and other invertebrates, grain taken from animal dung, carrion and scraps of human food. It has also been seen taking skin parasites from camels and, where not persecuted, scavenges around rubbish dumps and camp sites. Fruits of all types are eaten readily. It soars and plays in thermals even more so than other raven species and often associates with the brown-necked raven roosting in the same tree as it.<p>This species nests on rock ledges and in cavities in cliffs though very rarely in Somalia it has been known to nest in trees. There are usually 2–4 eggs laid. The great-spotted cuckoo (Clamator glandarius) sometimes uses this species as a brood host.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Rufous Songlark
Cincloramphus mathewsi
Plain brownish songbird with faint pale eyebrow and rust-colored rump. Similar female White-winged Triller has white-edged wing panel. Brown Songlark larger, with longer legs and bill and more strongly patterned upperparts. Found across much of Australia, less so in the southeast, in treeless open habitats. Spectacular song includes long sequences of trills and loud electrical phrases, very unlike Brown Songlark.
Yellow-footed Honeyguide
Melignomon eisentrauti
Medium-sized honeyguide with a plain face, a slim pale bill, yellow legs, and large white patches in the outer tail. Found in the middle levels and canopy of humid forest at low and middle elevations. The distinctive vocalization is a series of around a dozen rising “sveeya” notes. The series slows down and becomes slightly lower-pitched at the end. Very similar to Zenker’s Honeyguide, but there is only minor overlap in range, and Yellow-footed is paler overall with more white in the tail. Similar to other honeyguides, but separated by the slim bill and the yellow legs. Separated from most greenbuls by the white in the tail, and from Honeyguide and Sjöstedt's Greenbuls by the smaller size and shorter tail.
Scaly-breasted Partridge
Tropicoperdix chloropus
A cryptically-colored ground-dweller without the bright colors and bold head patterns boasted by many of its relatives. Mottled brown overall with a grayish-white face and a speckled orange throat. Forages in dense undergrowth like other partridges, usually in mature foothill and lowland forest. Listen for its song, a series of ascending breathy whistles which culminate in an echoing series of ringing notes. As with many other forest gamebirds, very difficult to see in general; most likely encountered at staked-out blinds, or, if one is lucky, walking quietly along roadsides and clearings at dusk and dawn.
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