Pacific Swift vs Great Dusky Swift
Apus pacificus 对比 Cypseloides senex
Side-by-Side Comparison
| 属性 | Pacific Swift | Great Dusky Swift |
|---|---|---|
| 学名 | Apus pacificus | Cypseloides senex |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 34.6 cm (13.6 in) | 33.8 cm (13.3 in) |
| 体重 | 41.516666666666666 g (1.46 oz) | 83.0 g (2.93 oz) |
| 食性 | Feeds aerially on tiny insects and spiders, often following weather fronts where aerial plankton concentrates. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| 产卵数 | 1-3 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Pacific Swift
Thin, reedy trill with nasal overtone; soft chattering notes delivered continuously during rapid low-level flight over fields.
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
Pacific Swift
Breeds from Siberia and Japan south to China and the Himalayas. Long-distance migrant wintering in Southeast Asia and Australia.
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
Pacific Swift
Great Dusky Swift
How to Tell Them Apart
Pacific Swift
Dark blackish-brown upperparts; distinctive white rump patch contrasting with dark back; white throat patch; underparts dark with pale brown barring; deeply forked tail; white rump distinguishes it from Common Swift …
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
Pacific Swift
白腰雨燕在西伯利亚至东南亚繁殖，迁徙至澳大利亚越冬，是大型雨燕。
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。