Gray-backed Hawk
Pseudastur occidentalis
An endangered raptor found only in western Ecuador and immediately adjacent parts of Peru. It has white underparts, dark gray back and wings, and gray streaks on the head. Its tail is white with a thick black band near the tip that is especially evident in flight. Restricted to areas where extensive forest cover remains. Prefers dry and semi-humid areas; not normally present in the wetter forests of northwestern Ecuador, but may occasionally wander into them.
识别特征
The grey-backed hawk is 45 to 52 cm (18 to 20 in) long with a 104 to 116 cm (41 to 46 in) wingspan. One female weighed 660 g (23 oz). Females are about 10% larger than males and both sexes have the same plumage. Adults have a gray and white streaked head, nape, and mantle. They have blackish gray upperparts and a mostly white tail with a wide black band near the end. Their eye is dark brown, their cere gray, and their legs and feet pale yellow. Immatures have brownish gray upperparts, a dusky-striped nape, and gray spots on the breast.
分类信息
The grey-backed hawk was traditionally placed in genus Leucopternis but following a 2006 paper, taxonomists moved it and two other species to genus Pseudastur. The grey-backed hawk is monotypic.
- 学名
- Pseudastur occidentalis
- 命名信息
- (Salvin, 1876)
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Pseudastur
分布与栖息地
The grey-backed hawk is found locally in western Ecuador between southern Esmeraldas and Loja provinces and slightly into Peru's Department of Tumbes. It inhabits subtropical and tropical semi-deciduous and evergreen forest, cloudforest, and secondary forest. It prefers moist areas and is often found in steep ravines. In elevation it mostly ranges between 100 and 1,400 m (330 and 4,600 ft) but occurs as high as 2,900 m (9,500 ft).
- 迁徙
- Resident species
行为
The grey-backed hawk is sedentary.<p>The grey-backed hawk's hunting method and diet are not well defined. It has been recorded hunting over streams and croplands and sometimes up to four will hunt together. Its diet includes reptiles, amphibians, crabs, rodents, birds, and large insects.<p>The grey-backed hawk appears to nest at any time of the year but its breeding activity appears to be concentrated between December and April, the local rainy season. Pairs make display flights. Nothing else is known about its breeding biology.<p>During the grey-backed hawk's display flights, one bird will make a "drawn-out screeching keeeaaarr-keeeaaarr... (which rises in central portion) or, alternatively, a high-pitched kéééoooowww".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Himalayan Swiftlet
Aerodramus brevirostris
Gray-brown swiftlet with a pale gray rump and a squared-off tail. The westernmost ranging species in the genus and the only member throughout much of its range. Smaller than most other swifts in range except for House Swift, which is black overall with a sharp white rump and throat. Tends to travel in small to medium-sized flocks, often swooping low over bodies of water. Builds dark bowl-shaped nests in closely-clustered colonies under rocky overhangs, in caves, and in old buildings. Gives clicking calls and twitters, especially when near colonies.
Least Auklet
Aethia pusilla
An abundant tiny auklet, only slightly larger than a sparrow. Occurs in large colonies around rocky shores during summer, and in smaller flocks further from the coast during winter. Summer plumage appears messy with numerous gray spots around the belly. Winter plumage is more contrastingly marked with flashing white belly and shoulders. Gives frequent, consistent squawks and squeaks at colonies. Readily separable from other auklets due to its whiter plumage and smaller size.
White-winged Widowbird
Euplectes albonotatus
The breeding male is black with a pale blue bill, brightly-colored shoulder epaulets (chestnut in northeast Africa, yellow elsewhere), and diagnostic white wing panels that are most obvious in flight. The distinctive display is a slow butterfly-like flapping. The non-breeding male is buffy and streaky, but retains the shoulder epaulets and wing panel. The female lacks the wing pattern and has a pale unstreaked belly. Pairs and flocks are resident with local movements in open savanna, brushy grassland, swamps, and cultivated areas.
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