Buller's Shearwater
Ardenna bulleri
Striking large shearwater with distinctive dark "M" pattern on upperwings. Also note crisp dark cap and clean white underwings and belly. Looks silvery-gray above when fresh, but worn birds can be more brownish. Graceful flight style. Usually easily separated from other shearwaters by wing pattern. Breeds on islands off New Zealand; ranges across the Pacific during nonbreeding season; uncommon off the west coast of the U.S. in fall. Rarely seen from land, prefers to stay offshore. Found singly or in flocks with other shearwaters.
识别特征
Adults birds are 46–47 cm (18–19 in) in length, with a 97–99 cm (38–39 in) wingspan, and have been recorded to weigh 342–425 g (12.1–15.0 oz). The upperside of Buller's shearwater is bluish grey. A blackish stripe runs from the tertiary remiges to the primary wing coverts. The primary remiges are blackish, also; the two black areas do not meet at the hand, however; the area between them is a rather light grey, and under bright light may appear almost white. With the bird facing upwards, the pattern gives the impression of a broken black "M", with light grey interspersing areas.<p>The underside is bright white; on the head the upperside's grey extends town to eye height and the white cheeks may shine up conspicuously, as in the smaller shearwaters of Puffinus sensu stricto. The rectrices are blackish and the tail is wedge-shaped; the bill and irises are dark. Fledged juveniles already have the adult's colouration; the nestlings are covered in grey down feathers.<p>Compared to other shearwaters, the species is unusually easy to identify at sea by its combination of considerable size and the distinctive, M-shaped banding pattern on its upperside while flying, uniquely among its genus and more akin to some gadfly petrels (Pterodroma), the prions (Pachyptila) and their relative, the blue petrel (Halobaena caerulea). These are all much smaller birds, perhaps two-thirds in length and wingspan and less than half in bulk of Buller's shearwater.
分类信息
- 学名
- Ardenna bulleri
- 命名信息
- (Salvin, 1888)
- 目
- Procellariiformes
- 科
- Procellariidae
- 属
- Ardenna
分布与栖息地
- 繁殖区
- PO : Poor Knights Is. (off ne North I., New Zealand)
- 非繁殖区
- to subarctic north Pacific, also e Australia and w South American waters to c Chile
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- stable
照片
分布
其他鸟类
Red-faced Barbet
Lybius rubrifacies
Chunky, medium-sized black barbet. There is red on the face, and the bottom part of the wing has white edging. Found locally in woodland, cultivated areas, and gallery forest. Usually in pairs or small groups. The call is an unmusical duet of low, rasping calls. Similar to Black-billed Barbet, but not known to overlap in range, and easily separated by lack of red on the throat or white edges to the top part of the wing.
Ringed Woodpecker
Celeus torquatus
This striking Celeus is widespread across the Amazonian lowlands of northern South America, with a disjunct population in southeast Brazil. Overall rufous with a shaggy crest like most other members of the genus. Distinctive and unlikely to be confused. Some variation across the range: most have extensive black markings on upperparts and belly, but largely unmarked in the northeastern part of range. All birds have solid black breast. Sexes are similar, but males have a red mustache. Occurs in mature forest and edges, often detected by its series of loud, strident whistles.
Purple-crested Turaco
Gallirex porphyreolophus
A bulky, iridescent bird clad in deep purple, blue, green, and olive washed with pink. It clambers acrobatically through riverine woodland and savanna thickets. In flight it explodes from the canopy with distinctive deep red panels in the wings. It produces a distinctive croaking “khoh-khoh-khoh-khoh….” that gets progressively louder before suddenly stopping. The similar Ross’s Turaco differs from Purple-crested Turaco by being darker overall and having a red crest and yellow face.
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