African Harrier-Hawk
Polyboroides typus
A large, grayish, naked-faced hawk with broad wings. The small, bare, yellow (sometimes flushed red) face, white-banded black tail, and underwing pattern distinguish it. The immature is blotchy brown with yellow-green facial skin and barred flight feathers. Harrier-hawks are specialists, foraging on eggs and nestlings, and they have double-jointed knees which allow them to access nest holes and other confined spaces. They are often seen clumsily clambering around on cliffs and trees when foraging. Although similar to chanting-goshawks, African Harrier-Hawk’s long but small angular head, broad wings, and tail pattern are diagnostic.
识别特征
The African harrier-hawk is a medium-sized raptor. The upperparts, head and breast are pale grey. The belly is white with fine dark barring. The broad wings are pale grey with a black trailing edge fringed with a narrow white line. The tail is black with a single broad white band. There is a bare facial patch of variable colour, usually red or yellow. Sexes are similar, but young birds have pale brown instead of grey, and dark brown replacing black. An unusual trait of this species is the double-jointed ankles it possesses, which enable it to reach into otherwise inaccessible holes and cracks for prey. A comparable leg-structure and behaviour can be found in the Neotropical crane hawk as well as the extinct Australian Pengana; a case of convergent evolution.<p>The call is a whistled sueee-sueee-sueee.
分类信息
- 学名
- Polyboroides typus
- 命名信息
- Smith, A, 1829
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Polyboroides
分布与栖息地
African harrier-hawks are a common raptorial species south of the Sahara being most commonly found in the tropical regions of western Africa becoming less common in East and South Africa. African harrier-hawks are adaptable in their habitat preferences, occupying the following habitats in the Dzanga-Sangha Special Reserve in the Central African Republic: thick rainforest, forest edge, riparian areas, agricultural land and human occupied areas. African harrier-hawks are adaptable and able to live in both urban and rural human occupied areas and they are one of the most common raptorial species in traditional rural villages of eastern Guinea-Bissau. African harrier-hawks have also been known to breed in Palm trees present in cities and urban gardens.
- 迁徙
- Resident species
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Salinas Monjita
Neoxolmis salinarum
Striking flycatcher restricted to the salt flats of the central Argentine lowlands. Very similar to Rusty-backed Monjita, but note unstreaked underparts on adult male, thinner breast streaks on female, and broader wing bars on adults of both sexes in Salinas Monjita. Malar markings also tend to be less distinct in Salinas Monjita than Rusty-backed.
Yellow-striped Brushfinch
Atlapetes citrinellus
Chunky greenish brushfinch of the understory of semi-humid montane forest in NW Argentina. Distinctive in range. Travels in pairs or small groups, often with mixed species flocks. Told from other Brushfinches by its all green body. Song a very high series of quick metallic warbles.
Thicket Antpitta
Myrmothera dives
Secretive and very difficult to see. Distinctive antpitta shape: very plump with hardly any tail, very long sturdy legs. Distinguished from other antpittas by rich rufous flanks with darker streaking on breast. Hops on the ground in dense forest, edges, and tangles; sometimes perches off the ground to sing (but still always concealed). Much more easily heard than seen; listen for its fast rising series of whistles.
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