Crane Hawk
Geranospiza caerulescens
Variably colored hawk with a small head and long legs. Frequents tropical lowlands, especially marshes, but also forest, woodland patches. Usually seen perched, at times clambering and flapping while using its double-jointed legs to grope around for prey in tree crevices. Adult has long reddish legs; Central American and northern South American birds have red eyes, while southern South American birds have yellow eyes. Immature has white-grizzled face. Long tail has 2 broad white bands, obvious in flight. Wingbeats rather loose and floppy, and soars rather infrequently.
识别特征
The crane hawk (Geranospiza caerulescens) is a species of bird of prey in the family Accipitridae. It is the only species placed in the genus Geranospiza.
分类信息
The crane hawk used to be many species that were recently[when?] lumped into one. Those species are now designated as subspecies. Color varies clinally, though, and it is now commonly accepted that they comprise one species. There are also two species of harrier-hawks in Africa of the genus Polyboroides that, while they are morphologically and behaviorally similar, are not very closely related. They serve as a good example of convergent evolution.<p>Six subspecies are recognised:
- 学名
- Geranospiza caerulescens
- 命名信息
- (Vieillot, 1817)
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Geranospiza
分布与栖息地
Crane hawks occur in tropical lowlands at the edge of forests and are almost always closely associated with water. It is found in Argentina, Belize, Bolivia, Brazil, Colombia, Costa Rica, Ecuador, El Salvador, French Guiana, Guatemala, Guyana, Honduras, Mexico, Nicaragua, Panama, Paraguay, Peru, Suriname, Trinidad, Uruguay, and Venezuela. They are an irruptive and local migrant, probably moving in response to changing water conditions.
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
White-winged Cuckooshrike
Edolisoma ostentum
A medium-sized, fairly long-tailed bird of forest and edge from the lowlands to middle elevations in the mountains on Panay and Negros. Gray on the crown, back, and rump. Has black wings with a large white patch, a black tail with white tips, and white under the base of the tail. Male has a black forehead, face, and chest, whereas the female has pale gray underparts. Similar to Bar-bellied Cuckooshrike, but smaller, lacking the barring on the belly, with white on the wing. Voice includes a harsh rising and falling shriek repeated at intervals.
Least Seedsnipe
Thinocorus rumicivorus
Very small but stocky, quail-like bird of Patagonian steppe, sandy and stony plains in the Andes, coastal dunes, and deserts. Found in pairs or small groups; locally large flocks in nonbreeding season. Male has hooting song given from low mounds or fence posts, and sometimes during display flight. Flight is strong and fast; flushes with loud bleating chatters. Similar Gray-breasted Seedsnipe is larger, favors rockier Andean habitats, and has plain gray breast without diagnostic black Y pattern present on male Least Seedsnipes.
Marbled Duck
Marmaronetta angustirostris
Small, subtly beautiful, gray-brown duck with a black eye-mask, long neck and wings, and dark bill. Vaguely resembles a female pintail. Both sexes are similar but males sport a more prominent shaggy crest. In flight looks pallid, with whitish underwings, pale secondaries, and dark wingtips. Mostly silent. Typically found in shallow, freshwater or brackish wetlands with abundant emergent vegetation.
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