Indian Yellow-nosed Albatross
Thalassarche carteri
Massive seabird, but relatively small and slender for an albatross. Breeds on islands in the Southern Indian ocean from Marion and Prince Edward to Amsterdam and St. Paul. Ranges mainly at subtropical latitudes in the Indian Ocean, from South Africa to Australia, rarely to New Zealand. On adult, note soft gray cheek, typically much less extensive than hood of Atlantic Yellow-nosed. Young birds mostly white-headed with limited gray around eye; some difficult or impossible to separate from Atlantic Yellow-nosed. Bill is long, thin, and black, with yellow-orange stripe along the top ridge (culmen) on adults. Also look for thicker black leading edge on underwing to help separate from White-capped Albatross at a distance. Also compare with Gray-headed and Black-browed Albatross; note underwing pattern, bill pattern, head color.
识别特征
The Indian yellow-nosed albatross weighs 2.55 kg (5.6 lb), is 76 cm (30 in) long and is 2 m (6.6 ft) across the wings. The adult has a pale grey or white head and nape, with a dark grey mantle, upperwing, and tail. Its rump and underparts are white, and its underwing is white with a black tip with a narrow black margin at the leading edge. Its bill is black with a yellow upper ridge and a red tip. The juvenile has a white head and all black bill. It is difficult to distinguish from the closely related grey-headed albatross and Atlantic yellow-nosed albatross, the latter with which it was long considered conspecific and is still considered by some a subspecies of. It can be distinguished from the Atlantic yellow-nosed by its head, the grey plumage of which is lighter on the Indian yellow-nosed.
分类信息
Mollymawks are a type of albatross that belong to the family Diomedeidae of the order Procellariiformes, along with shearwaters, fulmars, storm petrels, and diving petrels. They share certain identifying features. They have nasal passages called naricorns attached to the upper bill. The bills of Procellariiformes are unique in that they are split into between seven and nine horny plates. They make a stomach oil made of wax esters and triglycerides that is stored in the proventriculus. This is used against predators and as an energy rich food source for chicks and for the adults during their long flights. They have a salt gland above the nasal passage. It helps desalinate their bodies, due to the high amount of ocean water that they imbibe. The type-specimen is a black-beaked juvenile, which has caused confusion over its status until recently.
- 学名
- Thalassarche carteri
- 命名信息
- (Rothschild, 1903)
- 目
- Procellariiformes
- 科
- Diomedeidae
- 属
- Thalassarche
分布与栖息地
It breeds on Prince Edward Islands, the Crozet Islands, Kerguelen Island, Amsterdam Island (on the Falaises d'Entrecasteaux) and St Paul Islands in the Indian Ocean. When feeding during incubation, birds will forage up to 1,500 km (930 mi) from the colony. At sea it ranges from South Africa to the Pacific Ocean just beyond New Zealand, ranging from 30° S to 50° S.
- 繁殖区
- IO : Prince Edward Is. (s of South Africa), Crozet Is. (s of Madagascar), Amsterdam, St. Paul and Kerguelen is. (sw to se Indian Ocean)
- 非繁殖区
- mainly s Indian Ocean between Tropic of Capricorn and Subtropical Convergence
- 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
其他鸟类
African Hawk-Eagle
Aquila spilogaster
A medium-sized, boldly-patterned, dark-and-white eagle. In flight the underwing is brown and white with a thick black hind edge, and the tail is mostly pale gray with a thick dark bar at the end; these combine to give it a unique plumage pattern in flight. Immature birds have entirely rufous underparts, including the underwings. Resident in semi-arid rangelands, savanna, and riverine forest, where it primarily hunts birds; francolins and guineafowls are favored. Fairly quiet, but occasionally utters a distinctive melodious “klooeee”.
Horned Curassow
Pauxi unicornis
Very distinctive and very rare curassow of the central Bolivian Andes. Note distinctive blue vertical “horn” above the orange bill. Due to small range and high hunting pressure, only known from a few remote sites in the middle elevation forest of Santa Cruz and Cochabamba departments, Bolivia. Very wary and skittish, most easily detected by low, deep calls. You are part of an exclusive club if you see one of these in the wild.
Tepui Spinetail
Cranioleuca demissa
Small, creeping bird of highland forest canopy. Chestnut cap, wings, and tail contrast with olive-brown back and gray underparts. At close range, note somewhat decurved bill. Found only in humid highland forests of the tepui region (above 800 m), particularly in areas with heavy growth of mosses and epiphytes. Forages by hitching up large branches and tree trunks, and also creeps along limbs, inspecting bromeliads and bark crevices from which it gleans insect prey. Often encountered with mixed-species flocks. Voice is a long series of high tinkling notes, dropping in pitch and accelerating. No similar species occurs in tepui highlands.
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