Ivory-billed Woodcreeper
Xiphorhynchus flavigaster
Rather large, fairly common woodcreeper of tropical forest in both dry and humid areas. Feeds mainly on larger trunks, often probing into bromeliads and moving methodically. Note the long stout bill, which is mostly pale (but not really ivory colored), and the bold streaking on the head, back, and underparts. Streak-headed Woodcreeper is smaller and more active, with a slender, slightly decurved bill, very different voice.
识别特征
The ivory-billed woodcreeper is 20 to 26.5 cm (7.9 to 10 in) long. Males weigh 40 to 62 g (1.4 to 2.2 oz) and females 35 to 56 g (1.2 to 2.0 oz). It is a medium-sized member of genus Xiphorhynchus, with a long, fairly heavy, slightly decurved bill. The sexes have the same plumage. Adults of the nominate subspecies X. f. flavigaster have a face with fine buffy and blackish streaks, an indistinct buffy supercilium and eyering, and a faint dark stripe behind the eye. Their crown and nape are dark grayish brown with longish buff spots that are almost streaks. Their back and wing coverts are light grayish brown to olive-brown with blackish-edged buff streaks. Their rump, tail, and wings are chestnut. Their flight feathers are paler than the tail, with dusky tips on the outer primaries. Their throat is buffy with thin dusky streaks. Their upper breast is lighter than their throat and has a scaly appearance. The rest of their underparts are light buffy brown with dusky-edged buffy streaks that lessen to the belly. Their underwing coverts are ochraceous buff. Their iris is light reddish brown to dark brown, their bill pale with a brownish or bluish base to the maxilla, and their legs and feet yellowish green, olive-gray, or brownish. Juveniles are overall slightly darker than adults, with bolder streaks on the throat, duller streaks on the back and breast, and a brownish bill.<p>The other subspecies of the ivory-billed woodcreeper differ from the nominate and each other thus:<p>The subspecies have much individual variation that leads to weak differentiation among some of them. Most adjoining subspecies have intergrades.
分类信息
The ivory-billed woodcreeper has these eight subspecies:
- 学名
- Xiphorhynchus flavigaster
- 命名信息
- Swainson, 1827
- 目
- Passeriformes
- 科
- Furnariidae
- 属
- Xiphorhynchus
分布与栖息地
The subspecies of the ivory-billed woodcreeper are found thus:<p>The ivory-billed woodcreeper inhabits a variety of forested landscapes. It favors deciduous woodland and also occurs in semi-deciduous forest, evergreen forest, gallery forest, pine-oak and pine forest, thorn scrub, freshwater swamps, and mangroves. It inhabits the interior and edges of both primary and secondary forest and also plantations. It tends to be in drier landscapes than many other woodcreepers. In elevation it mostly occurs from sea level to about 1,500 m (4,900 ft) but locally ranges up to 2,900 m (9,500 ft).
- 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
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