Blyth's Swift vs Great Dusky Swift
Apus leuconyx 对比 Cypseloides senex
Side-by-Side Comparison
| 属性 | Blyth's Swift | Great Dusky Swift |
|---|---|---|
| 学名 | Apus leuconyx | Cypseloides senex |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Not Evaluated | Least Concern |
| 体长 | — | — |
| 翼展 | — | 33.8 cm (13.3 in) |
| 体重 | 42.949999999999996 g (1.52 oz) | 83.0 g (2.93 oz) |
| 食性 | Obligate aerial insectivore; takes small flies, beetles, and aerial spiders in swooping fast-flight passes. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| 产卵数 | 2-3 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Blyth's Swift
Loud, piercing screech with shrill metallic quality; powerful prolonged calls audible from considerable distances in open sky.
Great Dusky Swift
Loud, churring trill; harsher and louder than other Cypseloides; calls over Iguacu Falls and major Neotropical waterfalls; buzzy 'bzzzt-bzzzt' in aerial groups
Geographic Range & Migration
Blyth's Swift
Found from Central Asia and the Himalayas east to China and southeastern Russia. Migratory; winters in South and Southeast Asia.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
保护状况
Blyth's Swift
Great Dusky Swift
How to Tell Them Apart
Blyth's Swift
Dark blackish-brown upperparts; white rump patch; white throat; underparts dark brown; deeply forked tail; recently described species closely related to Pacific Swift; separation based on molecular and biometric characters.
Great Dusky Swift
Very large; entirely dark sooty-brown with pale grey forehead and chin scaling; slightly paler underparts; broad wings; largest Cypseloides swift; South American waterfall specialist with dusky uniform plumage and imposing …
About These Birds
Blyth's Swift
白爪雨燕分布于中亚至南亚，以白色爪子为特征的雨燕。
Great Dusky Swift
大暗色雨燕分布于巴西和阿根廷，在大型瀑布附近繁殖的雨燕。