Dark-rumped Swift vs Great Dusky Swift
Apus acuticauda مقارنةً بـ Cypseloides senex
Side-by-Side Comparison
| السمة | Dark-rumped Swift | Great Dusky Swift |
|---|---|---|
| الاسم العلمي | Apus acuticauda | Cypseloides senex |
| الرتبة | Caprimulgiformes | Caprimulgiformes |
| الفصيلة | Apodidae | Apodidae |
| حالة الحفاظ | Near Threatened | Least Concern |
| الطول | — | — |
| طول الجناح | 34,8 cm (13.7 in) | 33,8 cm (13.3 in) |
| الوزن | 37,43 g (1.32 oz) | 83,0 g (2.93 oz) |
| النظام الغذائي | 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 … |
| عدد البيض في الوضع | 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.
حالة الحفاظ
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
A medium-sized swift (17-18 cm) found in hill and montane regions of South and Southeast Asia, from the Himalayas to Indochina. Dark plumage with a contrasting dark rump. Aerial insectivore. Breeds on cliffs. Classified as Vulnerable due to limited breeding sites and habitat disturbance.
Great Dusky Swift
A large swift (18-20 cm) of southeastern Brazil, eastern Paraguay, and northeastern Argentina. Dark sooty-brown plumage. Aerial insectivore, foraging over forested gorges and waterfalls. Nests in large colonies behind waterfalls. The largest member of the genus Cypseloides.