Thick-billed Raven

Corvus crassirostris

A huge raven with a massive, bulging bill. There is a white patch on the back of the head and another at the tip of the dark bill. Found from middle to high elevations in a variety of habitats, including grassland, woodland, moorland, rocky areas, towns, and cities. Somewhat like Fan-tailed Raven, but much larger, with a white patch on the head. Large enough to be confused with raptors, but more uniformly black than any raptor. The call is a rattling “g-r-r-r-r-r,” lower and rougher than typical crow and raven vocalizations. 

分类信息

学名
Corvus crassirostris
命名信息
Rüppell, 1836
Passeriformes
Corvidae
Corvus

分布与栖息地

Its range covers Eritrea, Somalia and Ethiopia; its habitat includes mountains and high plateau between elevations of 1,500 to 3,400 metres. It is one of several avian species endemic to northeastern tropical Africa.

迁徙
Resident species

行为

The thick-billed raven is omnivorous, feeding on grubs, beetle larvae from animal dung, carrion, scraps of meat and human food. It has been seen taking standing wheat. When seeking food from dung, it has been seen using a distinct scything movement to scatter the dung and extract the grubs.[citation needed]<p>It nests in trees and on cliffs, apparently building a stick nest like the similar and much more widely distributed and studied white-necked raven. It lays three to five eggs. In one case, thick-billed ravens were observed to vigorously displace predatory Verreaux's eagle owls from their nest area.<p>Its calls include a harsh nasal croak, a low wheezy croak, a "raven-raven", and sometimes a "dink, dink, dink" sound. Like many corvids, the thick-billed raven is capable of vocal mimicry; however, this behavior is rare in the wild, and is normally recorded only in captivity.

保护状况

种群趋势
stable

照片

分布

其他鸟类

Rufous-cheeked Laughingthrush

Rufous-cheeked Laughingthrush

Garrulax castanotis

A dark gray laughingthrush with an orange ear patch and a black face, throat, and chest. Forages on the ground and in low shrubbery, usually in medium-sized flocks; associates with other species in mixed groups as well. Inhabits forested foothills, hills, and mountains. Hainan subspecies of Black-throated Laughingthrush has a less extensive black throat and brighter brown body.

Forest Wagtail

Forest Wagtail

Dendronanthus indicus

A distinctive wagtail with diagnostic wing and breast patterns. It has a prominent, whitish eyebrow with two black crescent-shaped bands on the upper breast; lower one wider when present. Upperparts are brown-gray with a greenish tinge. Two broad white wingbars on an otherwise black wing.  Immature is browner, less green above than adult, the breast-bands brownish-black and narrower, the lower one completely or partially missing. Inhabits all kinds of woodlands, foraging on forest paths, swinging its tail side to side (not up and down), and when disturbed, flushing into trees. Call is a metallic “pink” produced in flight. Song is a two-noted “tis-fee” repeated 4-5 times.

Ruddy Cuckoo-Dove

Ruddy Cuckoo-Dove

Macropygia emiliana

Shy and unobtrusive dove of lowland and foothill forests, woodlands, and wooded plantations. Rusty brown overall, with a paler, more gingery head. Compare with similar, but distinctly smaller, Little Cuckoo-Dove, which has a paler, buffier chest, and is generally also more tolerant of cultivated habitats. Like many other cuckoo-doves, typically forages quietly in the middle to lower levels of forest, occasionally emerging out into the open to rest or forage. Gives a series of cooing hoots, often with a few quiet connecting notes in between (“WHOOhuhuWHOOhuhuWHOO”), though the latter may be difficult to hear at a distance. Also a more pronounced two-part “huWOO, huWOO.”

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