Kermadec Petrel
Pterodroma neglecta
Fairly large and thickset petrel of offshore tropical and subtropical waters across the Pacific; not seen from mainland. Plumage is highly variable (white-bodied and white-headed, dark-headed, or wholly dark), but all types have a white flash on the wingtip, including diagnostic white feather shafts on upperwing, which enhance this petrel’s resemblance to jaegers and skuas. Indeed, sometimes Kermadec Petrels chase and pirate other petrels, as do jaegers and skuas. Herald Petrel is very similar, but is smaller and slimmer with a longer and more tapered tail, and lacks white shafts on upperwings.
识别特征
The Kermadec petrel (Pterodroma neglecta) is a species of gadfly petrel in the family Procellariidae. It is 38 cm long with a wingspan of 100 cm. It is polymorphic, with light, dark and intermediate morphs known. It eats squid, fish and other marine creatures.
分类信息
Genus: Pterodroma; Family: Procellariidae; Order: Procellariiformes.
- 学名
- Pterodroma neglecta
- 命名信息
- (Schlegel, 1863)
- 目
- Procellariiformes
- 科
- Procellariidae
- 属
- Pterodroma
分布与栖息地
It breeds in the Pacific Ocean from Lord Howe Island to the Juan Fernández Islands. Rarely is the Kermadec petrel recorded west of Lord Howe Island, where it maintains a small colony of less than 100 individuals on Balls Pyramid. In the past it also bred in some numbers on the main islands, however, this is seen as unlikely today. The Kermadec Islands are the only place in New Zealand where this species breeds, including on the following islands of the archipelago: Nugent, Napier, Meyer, Dayrell, North Chanter, Macauley, Haszard and Cheeseman Islands. Due to predation by cats and rats, it no longer breeds on Raoul Island, where in 1908 it had an estimated population of c. 500,000 individuals.<p>Not much is known of the bird's breeding pattern at Balls Pyramid, however, it usually nests there in late summer. This coincides with the breeding patterns of other birds in the Kermadec Islands. The larger of its two subspecies, P. n. juana, also breeds on Round Island, off Mauritius, where it may sometimes hybridise with the Trindade petrel. The species is a vagrant in Hawaii, Australia and New Zealand. Reported vagrants in Pennsylvania and North Carolina in the United States and also in the United Kingdom are thought to be dubious.<p>This species is monogamous and raises a single chick each year, which becomes independent after 100–130 days. The Kermadec petrel is unusual for its wide range of breeding times, with different colonies nesting from October to February or from February to March.<p>The size of the Australian population of Pterodroma neglecta neglecta (Schlegel, 1863) remains low, partly due to ongoing predation of eggs and chicks by Purple Swamphens Porphyrio porphyrio on Phillip Island.
- 繁殖区
- PO : subtropical Pacific Ocean: Round I. (ne of Mauritius, c Mascarenes, sw Indian Ocean); Lord Howe and Norfolk is. (far e of Australia), Kermadec Is. (ne of North I., New Zealand), Pitcairn to Easter (=Eastern groups; e Polynesia) and Juan Fernandez, San Ambrosio and San Felix (Desventuradas Is.; far w of nc Chile)
- 非繁殖区
- to e Australia, nw and ec Pacific to Hawaii and Peru
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Bolivian Antpitta
Grallaria cochabambae
Rotund, brown bird with long legs and a short tail restricted to the Bolivian Andes. Looks rather plain in the field, though may show a buffy tinge to the underparts. Similar to Leymebamba Antpitta, but larger, longer legged, and lacks gray in the plumage. Vocalizations include a whistled “wit-do” and a trill that drops slightly in pitch and then rises. It was formerly considered a subspecies of what used to be called Rufous Antpitta.
Taiwan Whistling-Thrush
Myophonus insularis
Large songbird, blackish-blue with metallic sheen, appearing black from a distance and in poor lighting. Up close, a brighter blue patch on the shoulder and dark red irides are diagnostic. Frequently bobs and fans tail. Inhabits streamside areas in shaded forests. Gives piercing whistles frequently; less frequently heard song is melodic and consists of assorted whistles and trills.
Rufous-capped Motmot
Baryphthengus ruficapillus
Large odd-looking bird with a long tail often swung from side to side or even held cocked when agitated. Usually sits quietly in the midstory and is easy to miss. The body is blue and green, with a black mask, and an orange cap and belly. Normally vocalizes at dawn and dusk an owl-like “hoo-oo-oo-oo-oo.” Nests in burrows.
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