Yellow-knobbed Curassow
Crax daubentoni
A large, elegant black and white turkey-like bird with a prominent curly crest. Both sexes have a white belly and white tipped tail, but the male has a larger crest and yellow base to the bill with a large yellow knob; female is faintly barred white on the breast and has dark gray bill lacking the knob. No overlap with other curassow species. Found in dry forest, gallery forest, and humid forest; most often encountered walking in understory or crossing trails in small groups, but sometimes also seen perched higher in trees. Vocally active in breeding season; song is a surprisingly high-pitched, long, descending whistle “WHEEEeeeeeeeeeeuuuuuuuuuuu,” reminiscent of a raptor.
识别特征
The yellow-knobbed curassow is 84 to 92.5 cm (2.8 to 3.0 ft) long. Males usually weigh between 2,925 and 3,200 g (6.4 and 7.1 lb) but one weighed only 1,625 g (3.6 lb). A female weighed 2,325 g (5.1 lb). The male is the only curassow with a knobbed yellow cere and wattle. Males and females are mostly black with a white lower belly, vent area, and tips of the tail feathers. Females have a black cere and pale barring on the breast and lower belly.
分类信息
The yellow-knobbed curassow was formerly classified as a subspecies of blue-billed curassow (Crax alberti). It is monotypic. A few subspecies previously proposed for it were determined to be hybrids or aberrant individuals and so were not adopted.
- 学名
- Crax daubentoni
- 命名信息
- Gray, GR, 1867
- 目
- Galliformes
- 科
- Cracidae
- 属
- Crax
分布与栖息地
The yellow-knobbed curassow is found in northern Venezuela as far east as Sucre and Monagas states and in immediately adjacent northeastern Colombia. It primarily inhabits gallery forest and tall scrub in the llanos. It also occurs in valleys and ravines in the nearby foothills. In elevation it ranges between 500 and 1,500 m (1,600 and 4,900 ft) in Colombia and 100 and 800 m (330 and 2,600 ft) in Venezuela.
- 迁徙
- Resident species
行为
The yellow-knobbed curassow forages in small family groups, or in combined ones of up to 15 birds in the dry season. Its primary foods are fruits and seeds with very small amounts of leaves, other plant parts, and insects. It feeds at all levels from the ground to the treetops.<p>The yellow-knobbed curassow lays eggs during May and June, the early part of the rainy season. It appears to be polygynous. It builds an oval nest of branches and lianas lined with leaves and grass and usually sites it in a tree and concealed by vines. The clutch size is two eggs.<p>Male yellow-knobbed curassows sing a "bomb-dropping" descending whistle, sometimes combined with a wing-clapping display or booming. The former is "4–10 rapid cracks of wings above the bird’s back, 'wapp!, wapp!, wapp!-wapp!-wapp!'". The booming is described as "uuumh...uhh".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Mexican Whip-poor-will
Antrostomus arizonae
Cryptic nightbird, more often heard than seen. Listen for namesake song, a whistled "whip-poor-WILL," repeated endlessly. Rolling and more trilled than Eastern Whip-poor-will song. Found in forests in foothills and canyons, often with a mixture of pines and deciduous trees, and open areas nearby for foraging. Forages at night from the ground for flying insects. Intricately patterned with gray, brown, and black. Similar to Common Poorwill but with longer tail, different voice, and different habitat. Eastern and Mexican Whip-poor-wills were recently split into separate species; they differ mainly in voice and do not overlap in range.
Golden Whistler
Pachycephala pectoralis
Compact songbird with short bill. Males in much of range are olive above, yellow below, with white throat set in black head; males and females on Norfolk Island are olive-brown with yellowish underparts (brightest on undertail). Females vary across range, with eastern birds having some amount of yellow on the underparts and western birds (formerly treated as full species, “Western Whistler”) being gray-brown above and pale below, lacking yellow. Olive Whistler much browner below, with well-defined whitish bib. Inhabits a great variety of habitats. Bright, whistled song varies, but often has a whip-like ending.
Red-fronted Antpecker
Parmoptila rubrifrons
A small, slender-billed warbler-like waxbill with pinkish-brown legs and different-looking sexes: the male has a red forehead, dull brown upperparts, light scaling on the face, and rusty-chestnut underparts, while the female has pale underparts with scattered dark chevrons, mostly brown upperparts, and a white-speckled head. Pairs and small groups forage alone or in mixed-species flocks, in the understory and middle levels of primary and swamp forest, often near water. Eats insects, with a fondness for ants. Call is a high-pitched downslurred “peeeee.”
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