Flying Steamer-Duck
Tachyeres patachonicus
A large, heavily built duck that is fairly common along rocky seacoasts and on lakes near the coast; also local and uncommon on larger lakes farther inland. Despite the name, rarely seen in flight; more often seen thrashing through the water like an old paddle steamer boat, hence the name. Male’s bill is mostly orange, while the female’s bill is mostly greenish. Plumage of both sexes is duller gray or brownish gray compared to Flightless Steamer-Duck; the two species sometimes occur together, but Flightless tends to be warier.
识别特征
Though they are the smallest of the four Tachyeres species, flying steamer ducks share similar plumage traits with other steamer ducks including brown head and neck feathers with white stripes stretching from their eyes to the napes of their necks, and brown-gray gradient body feathers. Their underbellies are mostly white, and their feet are orange. Female flying steamer ducks have smaller bills relative to males that are orange with black tips, while males have darker gray bills with slight yellow accents. Flying steamer ducks are also sexually dimorphic to the extent that males are heavier but have smaller cranial elements and wingspans than females. Males and females both possess cornified orange carpal knobs on the proximal part of the carpometacarpus bone, and these knobs are used in display as well as interspecies and intraspecies combat by males.<p>Sexual dimorphism can also be observed in the duration and pitch of their various calls, which sound much like grunts. The females’ grunts have been described as lower pitched than the males’ grunts, and usually occur in rapid succession of similar pitch. Males have three distinct grunts that have been described as whistle-like, including a ‘rasping’ grunt, a ‘ticking’ grunt, and a ‘sibilant’ grunt.<p>Flying steamer ducks undergo three molts per annual cycle, and these molts vary widely with geographic location. The wear and degradation on the primary and secondary feathers of observed flying steamer ducks varies depending on the location and flight behavior of the individuals.
分类信息
- 学名
- Tachyeres patachonicus
- 命名信息
- (King, PP, 1831)
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Tachyeres
分布与栖息地
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Green-breasted Mountain-gem
Lampornis sybillae
Medium-sized hummingbird, not particularly bright. Green above and dingy grayish below with dense green spots on sides and breast. Adult males have iridescent green throat that looks gray at most angles; females and young birds have white or buffy throat. In all plumages, look for white line behind eye. Tail dark with white outer tail feathers. Found in montane forests and edges, often with pines and oaks.
Pohnpei Kingfisher
Todiramphus reichenbachii
The only kingfisher on Pohnpei. Dashing, with a dark greenish-blue back, snow-white underparts and collar, and orange crown. Favors open wooded habitats such as forest edge, gardens, and early-successional forest. Pounces on prey from a low and exposed perch. Gives a loud, insistent series of “kweep”s.
White-chinned Petrel
Procellaria aequinoctialis
Common, rather large dark petrel of the Southern Ocean; regular migrant north into Humboldt Current. Usually looks wholly blackish with a pale, ivory-colored bill—the white chin is often just a few feathers and frequently is difficult to see in the field, although it can be more extensive, especially on Atlantic and Indian Ocean birds. White-chinned is obviously larger than dark-billed Sooty Shearwater and much smaller than giant-petrels, which have huge pale bills. Pale bill tip distinguishes White-chinned from similar Westland and Parkinson’s Petrels, which have dark bill tip.
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