Dollarbird
Eurystomus orientalis
Heavily built, flat-headed dark blue bird with a short bright red bill. In flight has a characteristic white circle, or ‘dollar’, on each underwing. Juvenile lacks red bill. May resemble mynas in flight, but note longer wings, larger head, and more powerful, less frantic flight. Nests in cavities; typically tree hollows. Frequently perches on power-lines or in the tops of tall dead trees.
识别特征
The oriental dollarbird has a length of up to 30 cm. It is dark brown but this is heavily washed with a bluish-green sheen on the back and wing coverts. Its belly and undertail coverts are light coloured, and it has glossy bright blue colouring on its throat and undertail. Its flight feathers are a darker blue. Its bill is short and wide and in mature animals is coloured orange-red with a black tip. It has very light blue patches on the outer parts of its wings which are highly visible in flight and for which it is named. The females are slightly duller than the males but overall the two are very similar. Immature birds are much duller than the adults and do not have the blue colouring on their throats. They also have brown bills and feet instead of the red of the adults.
分类信息
The Oriental dollarbird was formally described by the Swedish naturalist Carl Linnaeus in 1766 in the twelfth edition of his Systema Naturae under the binomial name Coracias orientalis. Linnaeus based his description on "Le Rollier des Indes" that had been described and illustrated by the French zoologist Mathurin Jacques Brisson in 1760. The type locality is the island of Java in Indonesia. The Oriental dollarbird is now placed in the genus Eurystomus that was introduced in 1816 by the French ornithologist Louis Pierre Vieillot.<p>A molecular phylogenetic study published in 2018 found that the azure dollarbird (Eurystomus azureus) was nested in a clade containing subspecies of the Oriental dollarbird. Formerly, some authorities have also considered the broad-billed roller and the azure dollarbird to have been subspecies of the oriental dollarbird. The generic name derives from Ancient Greek eurustomos 'wide-mouthed' and the specific epithet is Latin orientalis 'eastern'. Alternate names for the oriental dollarbird include the Asian dollarbird, dark roller, dollar roller, dollarbird, eastern broad-billed roller and oriental broad-billed roller.<p>Ten subspecies are recognized:
- 学名
- Eurystomus orientalis
- 命名信息
- (Linnaeus, 1766)
- 目
- Coraciiformes
- 科
- Coraciidae
- 属
- Eurystomus
分布与栖息地
The oriental dollarbird is found from Australia to Japan and India. It breeds in northern and eastern Australia between the months of September and April and winters in New Guinea and nearby islands. The birds prefer open wooded areas with hollow-bearing trees to build nests in.
- 迁徙
- Complete migrants
行为
The oriental dollarbird is most commonly seen singly with a distinctive upright silhouette on a bare branch high in a tree, from which it hawks for insects, returning to the same perch after a few seconds.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Dull-capped Attila
Attila bolivianus
Big-headed flycatcher of humid rainforest midstory. Rich red-brown with a slightly grayer head and pale eye. Perches with upright posture and appears rather stocky, with a short tail, large head, and heavy bill. Pale eye and fairly dark plumage help distinguish it from other attilas, as does voice. Listen for a rising series of whistles, usually finished with a lower note: “weer, weer, weer, weer, woo”; sounds melancholy, without the upbeat, double-syllable note phrasing of Bright-rumped Attila.
Blue-gray Robin
Melanodryas cyanus
A fairly small bird of montane forest. Blue-gray plumage, with contrasting blackish wings and tail. Perches low down, often on diagonal branches or vertical mossy trunks, flicking its tail and scanning the ground for insects. Very similar to Smoky Robin, but Blue-gray has a distinct bluish tinge to the gray, lacks the paler belly and has more contrasting black wing feathers. Several different vocalizations, including mournful, monotonous whistles, an up-and-down, whistled jumble and a rasp.
Ruddy Spinetail
Synallaxis rutilans
Small, patchily distributed bird humid forests. Entirely rufous in most of its expansive range, but at the eastern end of its distribution in Brazil it is mostly sooty-colored with rufous wings. Long-tailed profile, terrestrial habits, and small black mask should clinch identification. Found near the ground inside lowland forest and in premontane forest in the tepui region, often around treefall gaps or other areas with dense understory. Often in pairs. Vocal; two-noted song often given in duet is distinctive in habitat.
开始您的观鸟之旅
在户外识别鸟类，并在下一次观察时随手查阅鸟类图鉴。