Grey-rumped Swift vs Great Dusky Swift
Chaetura cinereiventris 对比 Cypseloides senex
Side-by-Side Comparison
| 属性 | Grey-rumped Swift | Great Dusky Swift |
|---|---|---|
| 学名 | Chaetura cinereiventris | Cypseloides senex |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 20.9 cm (8.2 in) | 33.8 cm (13.3 in) |
| 体重 | 16.15 g (0.57 oz) | 83.0 g (2.93 oz) |
| 食性 | Obligate aerial forager catching small flies, aphids, winged termites, and airborne spiders on the wing. | 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
Grey-rumped Swift
Soft, rippling trill with gentle buzzy overtones; light aerial call carrying a faint liquid quality on calm mornings.
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
Grey-rumped Swift
Found from Nicaragua south through Central America and northwestern South America to Bolivia and Brazil. Resident in lowland forest and edge.
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
Grey-rumped Swift
Great Dusky Swift
How to Tell Them Apart
Grey-rumped Swift
Small; dark blackish-brown upperparts; pale grey rump contrasting with dark back; underparts dark grey-brown; short spiny tail; Neotropical species with the grey rump as key field mark; widespread from Caribbean …
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
Grey-rumped Swift
灰腹雨燕 (Chaetura cinereiventris)，体长约11厘米。上体黑褐色，腰部灰色，喉和腹部淡灰色，与深色上体形成对比。分布于中美洲至南美洲的热带地区。以飞行昆虫为食，常成群在林冠上空穿梭。
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。