Barau's Petrel
Pterodroma baraui
A pale, mid-sized petrel with white underparts, dark cap, white forehead, and black margins to the white underwing. In flight, also note the distinctive, dark “M” on the gray upperparts. Easy, buoyant flight in calm weather, often gaining height and gliding down towards the ocean surface. Wheels high and steeply in strong weather.
识别特征
Barau's petrel is around 40 cm long, and has white undersides and forehead. Its bill is black and its upper parts are dark, with a moderately distinct "M" pattern across the wings and back.
分类信息
- 学名
- Pterodroma baraui
- 命名信息
- (Jouanin, 1964)
- 目
- Procellariiformes
- 科
- Procellariidae
- 属
- Pterodroma
分布与栖息地
Barau's petrel ranges across the Indian Ocean from Réunion to Western Australia and Indonesia. With the exception of a single nest found on the island of Rodrigues the bulk of the population is thought to nest on Réunion.
- 繁殖区
- IO : montane Réunion (w Mascarenes, sw Indian Ocean)
- 非繁殖区
- tropical Indian Ocean mostly s of the Equator, off e, s Madagascar; to Arabian Sea and nw Australian waters
- 迁徙
- Complete migrants
行为
The petrels are highly pelagic at sea, preying on small fish (10 cm) by surface-seizing and plunge diving. They will associate with other species while feeding.<p>Their colonies are unusual in being far inland and at high elevations; they dig burrows under the forest at around 2,400-2,700m above sea level. The breeding biology of the species has not been studied but it is inferred that they have a 55-day incubation period and take around 100–120 days to fledge a chick. Unlike most burrow nesting procellariids, Barau's petrels begin to return to their colonies diurnally, returning in the late afternoon and riding the thermal updrafts to conserve energy. The chicks fledge between November and February. Sites which have been identified by BirdLife International as being important for the conservation of the species include the Grand Bénard – Tapcal and Piton des Neiges – Gros Morne Important Bird Areas (IBAs) on Réunion where breeding colonies exist.
保护状况
Barau's petrel is considered to be an endangered species. It has a highly restricted breeding range and has suffered hunting pressure in the past. While the shooting of the species has now been stopped, and the population seems to have recovered, it is currently threatened by introduced species (especially feral cats, who threaten both chicks and adults) and light pollution. Young birds, particularly fledglings, are disorientated by artificial lights such as streetlights or the floodlights of sporting venues, which they mistake for bioluminescent squid, and lead them to fail reach the sea. It is estimated that as much as 40% of each breeding season's fledglings get confused in this fashion. Conservation organisations work with local people to catch disorientated chicks and release them back at sea, a program that is thought to rescue most of the lost chicks. Measures are also underway to reduce light pollution by shielding light sources so that they don't attract young birds, a method that has been used to help Newell's shearwaters in Hawaii.
- 种群趋势
- declining
照片
分布
其他鸟类
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Phylloscopus borealis
Dull, relatively unmarked olive-brown warbler with a prominent yellowish-white eyestripe, faint wingbars, and pale whitish underparts. Visually inseparable from Japanese and Kamchatka Leaf Warblers; listen for song, an electric chattery trill. Also gives a metallic two-noted call and a short harsh buzz. Breeds in shrubby areas, often near water, throughout the Eurasian taiga. Breeding range extends to Alaska, where it is the only leaf warbler. Winters in lowland and foothill forest, forest edge, and gardens, primarily in Southeast Asia.
Orange-eyed Thornbird
Phacellodomus erythrophthalmus
Medium-sized thornbird with a long tail. Note orange eyes and rufous forehead, throat, and tail while the body is largely brown. Similar to Orange-breasted Thornbird, but has orange rather than dark eyes. Found in pairs on the edge of humid forests, usually near marshes and water bodies where it builds huge stick nests. The song is loud and nasal, usually delivered as a duet.
Pale-breasted Thrush
Turdus leucomelas
A common and widespread thrush found in open woodland and forest edge across much of lowland South America. Nondescript: brownish overall with grayer crown, streaked throat, and dingy yellowish bill. Compare with Creamy-bellied Thrush, which is darker overall with dark lores and more contrasting throat streaking. Usually rather conspicuous; singles or pairs can often be seen hopping in the open or feeding in a fruiting tree.
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