Macquarie Shag
Leucocarbo purpurascens
A black-and-white shag with a bright white throat and underside and a mostly black upperside. Note the bright blue eye-ring and large yellow warty patch of skin in front of the eyes. Breeding adult has a wispy crest. Marine, nesting coastally. No other similar birds occur within its limited range. Calls include growls, barks, and hisses.
识别特征
The Macquarie shag has largely black upperparts and white underparts. The upper cheeks and ear-coverts are black; there are white bars on the wings, a black, recurved crest over the forehead, and pink feet. A breeding adult has a pair of orange caruncles above the base of the bill in front of the eyes, orange-brown facial skin at the base of the lower mandible, as well as blue eye-rings. It is about 75 cm in length, with a wingspan of 110 cm and a weight of 2.5–3.5 kg.
分类信息
The Macquarie shag is one of the blue-eyed shags, sometimes placed in the genera Leucocarbo or Notocarbo. Others place it in the genus Phalacrocorax. It is now usually considered to be a full species.
- 学名
- Leucocarbo purpurascens
- 命名信息
- (Brandt, JF, 1837)
- 目
- Suliformes
- 科
- Phalacrocoracidae
- 属
- Leucocarbo
分布与栖息地
The Macquarie shag is restricted to subantarctic Macquarie Island and the nearby Bishop and Clerk Islets, part of the Macquarie group, 33 km to the south. Apart from breeding and roosting, its habitat is marine.[citation needed]
行为
Macquarie shags are gregarious, roosting in groups of from a few birds up to several hundred.<p>The birds are present all year round at Macquarie Island, where they breed annually in small to large colonies on bare rocky shores and stacks. Nest-building takes place from June. Nests are truncated cones, 20–30 cm in height, built of vegetation, guano and mud. The clutch of two or three eggs is laid between mid-September and January, mainly in late September and early November, with most eggs hatching by late December. Most chicks are independent of their parents by mid-February.<p>The birds forage locally in shallow coastal waters, with the diet consisting primarily of benthic fish. Flocks may feed together.
保护状况
The Macquarie shag population was estimated in 2000 to comprise about 760 breeding pairs, including 100 pairs at the Bishop and Clerk Islets. A later (October 2003) survey found 472 nesting pairs in eleven colonies on Macquarie Island itself, indicating a 30% decline.<p>The taxon is listed as Vulnerable under Australia's Environment Protection and Biodiversity Conservation Act 1999, because the population is small, localised and subject to fluctuations in breeding success due to weather conditions and food availability. Other threats include predation of nestlings by Subantarctic skuas and black rats.
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其他鸟类
Butterfly Coquette
Lophornis verreauxii
Tiny hummingbird with a white rump band and rusty tail. Adult male is stunning, with a flowing, glittering green beard ending in white spots, an iridescent green face, and a small crest. Female and young male are much plainer than male, but they typically have a white throat with dark patch in the middle, and lack the buffy or rusty tones on the underparts shown by females of several similar species. Distinguished from female Peacock Coquette by lack of streaking on the throat. Inhabits humid lowland and foothill forest and is quite scarce in most of its range. It was previously considered to be a subspecies of Festive Coquette.
Black-and-white Warbler
Mniotilta varia
Distinctive warbler with bold black-and-white stripes over entire body. Adult males have black throat and cheek; females and immatures have white throat and paler cheek. Creeps along branches like a nuthatch, searching for insects. Breeds in mature deciduous or mixed forests; winters in a wider variety of wooded habitats as far south as northern South America. Listen for high pitched “squeaky-wheel” song. Breeding male Blackpoll Warbler is potentially confusing, but note different behavior and face pattern.
Blue-winged Macaw
Primolius maracana
Fairly small macaw with a bare white face that contrasts with its dark bill. It has a small red forehead, which can be quite difficult to see, a blue crown, and a red belly. The flight feathers are striking blue. Usually seen in pairs or small groups at forest edges, palm groves, and open woodlands. The flight call is a mellow “graaaa.”
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