Dark-rumped Swift vs Great Dusky Swift
Apus acuticauda 对比 Cypseloides senex
Side-by-Side Comparison
| 属性 | Dark-rumped Swift | Great Dusky Swift |
|---|---|---|
| 学名 | Apus acuticauda | Cypseloides senex |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Near Threatened | Least Concern |
| 体长 | — | — |
| 翼展 | 34.8 cm (13.7 in) | 33.8 cm (13.3 in) |
| 体重 | 37.43 g (1.32 oz) | 83.0 g (2.93 oz) |
| 食性 | Aerial insectivore feeding on swarms of small flies, winged ants, and tiny beetles during sustained … | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| 产卵数 | 2-4 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Dark-rumped Swift
Thin, high twittering with silvery sheen; rapid sequence of light notes with gentle tremolo quality at dawn and dusk.
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
Dark-rumped Swift
Found in northeastern India (Assam) and adjacent Myanmar. Rare and poorly known; found in forested hills and river valleys at moderate elevation.
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
Dark-rumped Swift
Great Dusky Swift
How to Tell Them Apart
Dark-rumped Swift
Dark sooty-brown throughout with dark rump concolorous with back; no contrasting white rump patch; pale white throat; underparts dark brown; Himalayan endemic cliff-nester; dark rump contrasting with white-rumped relatives is …
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
Dark-rumped Swift
印度雨燕是印度次大陆的特有种，以尖锐的尾巴为特征的中型雨燕。
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。