Double-toothed Kite
Harpagus bidentatus
Small hawk of tropical forests, mainly in the lowlands, that overall looks a lot like a loosely built Sharp-shinned Hawk. Most frequently seen soaring in mid-late morning, singly or in pairs, with wings bowed down, tail closed, and puffy white feathering visible under the base of the tail—a distinctive combination of features. Rarely seen perched, but can be very tame. When perched, note 3 narrow white tail bands and a black stripe down the center of the throat. The cutting edge of the bill has a double notch (hence the name double-toothed) that is rarely visible.
识别特征
The double-toothed kite is 29 to 35 cm (11 to 14 in) long with a wingspan of 60 to 72 cm (24 to 28 in). Males weigh about 160 to 200 g (5.6 to 7.1 oz) and females about 190 to 230 g (6.7 to 8.1 oz). The species gets its English name from the tooth-like notches on the edge of its maxilla. Males and females have similar plumage though the females' colors are richer. Adults of both subspecies have a dark gray head with a white throat that has a dark stripe down its center. Their upperparts are a somewhat lighter gray and their tail blackish with three grayish bands and a gray tip. Their eyes are red, their cere greenish yellow, and their legs and feet yellow. The nominate subspecies has a rufous breast, a rufous belly with gray and whitish barring that sometimes extends into the lower breast, and white undertail coverts. Adults of subspecies H. b. fasciatus have similar underparts to the nominate but the rufous is paler and less extensive and the barring heavier and more extensive. Immatures of both subspecies have deep brown upperparts and whitish to buff underparts with bold vertical brown streaks.
分类信息
Despite its English name, the double-toothed kite is not closely related to most other kites but to the "true" hawks. It shares its genus with the rufous-thighed kite (H. didion). It has two subspecies, the nominate H. b. bidentatus and H. b. fasciatus.
- 学名
- Harpagus bidentatus
- 命名信息
- (Latham, 1790)
- 目
- Accipitriformes
- 科
- Accipitridae
- 属
- Harpagus
分布与栖息地
The nominate subspecies of double-toothed kite has the more southerly range of the two. It is found on Trinidad and from eastern Colombia east through Venezuela and the Guianas and south and east into Amazonian Ecuador, Peru, Bolivia, and Brazil. A separate population is found in southeastern Brazil. Subspecies H. b. fasciatus is found from Jalisco and southern Veracruz in Mexico through the Caribbean slopes of Guatemala, Belize, and Honduras and both slopes of Nicaragua, Costa Rica, and Panama into western Colombia and western Ecuador. One individual has been documented as a vagrant in Texas.<p>The double-toothed kite primarily inhabits the interior of mature subtropical and tropical forest. It occurs less frequently at forest edges and clearings, young secondary forest, scrubby woodland, and disturbed forest. In elevation it ranges from sea level to at least 1,200 m (3,900 ft) in Costa Rica, about 1,200 m (3,900 ft) in Colombia, and 2,100 m (6,900 ft) in Ecuador.
- 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
Planalto Slaty-Antshrike
Thamnophilus pelzelni
Small antshrike found in the lower and middle levels of dry forests and at the edge of humid forests. Males are gray overall with a black crown, and white-spotted black wings and tail. Females have a rusty crown, back, and tail, are buff below with white spots on the wings. The song is a loud and long series of around 20 descending notes that accelerate in pace. Doesn’t overlap in range with similar Sooretama Slaty-Antshrike and is told from Variable Antshrike by paler gray plumage in males and richer rufous color in females.
Parasitic Jaeger
Stercorarius parasiticus
Slender gull-like seabird; the middle-sized of the three jaegers. Breeds on Arctic tundra; spends the rest of the year at sea. Difficult to separate from other jaegers. Breeding adults have a long pointed tail (not as long as Long-tailed Jaeger). Plumage varies from entirely dark blackish-brown to paler with white belly and yellowish on the side of the neck. Immature birds are variable but usually warm brown with cinnamon barring on wings. Barring on underwing and undertail is weaker than on Pomarine Jaeger. Shape and flight style are intermediate between Pomarine and Long-tailed. Typically shows white shafts on four to six outermost wing feathers, more than Long-tailed, but less than Pomarine. Bill is relatively long and slender. All jaegers chase other birds and steal their food.
Blue-crowned Hanging-Parrot
Loriculus galgulus
Adorably tiny and luminous parrot. Both sexes have a blue crown and red rump, though these features are much more extensive and noticeable on the male than on the female. Males also have a flashy red throat patch and a yellow-orange patch on the back. Forages in small flocks in forests, parks, and gardens. Usually seen shooting by overhead. Gives high-pitched squeaks, screams, and chatters.
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