Slaty-backed Forest-Falcon
Micrastur mirandollei
Forest-falcons are well-named raptors; they are found almost exclusively inside the forest. They are generally slender and long-tailed, with long legs. Slaty-backed is clean-looking, smooth gray above and white below. Juveniles have a scaly pattern on breast. Similar to several other raptors, including Bicolored Hawk; note more extensive yellow skin around eye. As with all forest-falcons, more often heard than seen, and more easily identified by voice. Sings from the canopy, mostly at dawn and dusk. Listen for series of mournful “aww” notes, similar in tone to Collared Forest-Falcon (but Collared typically gives single notes).
识别特征
The slaty-backed forest falcon is 40 to 45 cm (16 to 18 in) long. Males weigh about 420 g (15 oz) and females about 500 to 556 g (18 to 20 oz). Its wingspan is 65 to 71 cm (26 to 28 in). Adults have slate gray upperparts, and are darker on the crown and lighter on the cheeks. Their throat and underparts are white to cream, and plain but for a few dark feather shafts making streaks. Their tail is dark slate gray with a white tip and three narrow white bars that often are indistinct. Their iris is yellowish brown to dark brown, its cere greenish yellow, and its legs and feet bright yellow. Juveniles have dark brownish gray upperparts and off-white to yellowish buff underparts with a scaly appearance.
分类信息
The slaty-backed, collared, and Buckley's forest falcons are sister species. The slaty-backed forest falcon is monotypic. The populationin Central America and western Colombia and Ecuador has at times been treated as subspecies M. m. extimus but this separation has not been widely recognized.
- 学名
- Micrastur mirandollei
- 命名信息
- (Schlegel, 1862)
- 目
- Falconiformes
- 科
- Falconidae
- 属
- Micrastur
分布与栖息地
The slaty-backed forest falcon is found from Costa Rica through Panama and western Colombia into western Ecuador's Esmeraldas Province. A separate, much larger, range is found in the Amazon Basin from eastern Colombia, eastern Ecuador, eastern Peru, and northern Bolivia east through Venezuela, the Guianas, and northern Brazil to the Atlantic coast. It mostly inhabits lowland rainforest, favoring undisturbed areas, but also occurs in mature secondary forest and sometimes in rather open landscapes. It is often found near watercourses. In elevation it occurs as high as 500 m (1,600 ft) but is mostly below 200 m (700 ft).
- 迁徙
- Resident species
行为
As far as is known the slaty-backed forest falcon is a year-round resident throughout its range.<p>The slaty-backed forest falcon's diet has not been detailed but is known to include birds, lizards, and snakes. It mostly hunts from the understorey to the forest's mid level but will go to the ground. It might follow army ant swarms to capture smaller birds feeding on what flees the ants.<p>Nothing is known about the slaty-backed forest falcon's breeding biology. It is assumed to nest in tree cavities like other Micrastur forest falcons.<p>The slaty-backed forest falcon's primary vocalization is a "chanting series of 8-13 nasal, shouting kiiih or kaaah notes". It also makes a "high-pitched eek-eek-eek...", apparently to provoke small passerines to mob it so it can catch one.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Socotra Buzzard
Buteo socotraensis
A typical medium-sized brown-and-white buzzard that was only recognized as distinct in 2010. The underparts are whitish buff with heavily streaked underparts (lighter on the throat). Underwings display significant contrast, with pale primaries and secondaries standing out against black 'wrists' and rusty 'wingpits'. Juveniles are buffier and less heavily streaked. Uncommon resident endemic to Socotra, mostly between 150–800m, preferring ravines and cliffs; other buzzards are vagrants. Calls like other buzzards.
Brazilian Merganser
Mergus octosetaceus
Unmistakable in range. Odd-looking duck with a long thin bill, dark green head, and spiky crest. In flight, exhibits white wing panels. It is a very rare inhabitant of precious few fast-flowing clearwater rivers with abundant fish, which it catches by diving.
Canada Jay
Perisoreus canadensis
Adults are gray overall with a white head and dark nape. Juveniles are dark sooty-gray with a white mustache stripe. Some variation across range; Rocky Mountain birds are palest. A bird of northern latitudes and high elevations; found in coniferous forests and clearings. Almost always in pairs or small family groups. Known for friendly, inquisitive behavior. Often seen around campgrounds and roadsides, looking for food handouts. Voice consists of variable soft, husky notes.
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