Great Dusky Swift vs White-rumped Spinetail
Cypseloides senex so với Zoonavena sylvatica
Side-by-Side Comparison
| Thuộc Tính | Great Dusky Swift | White-rumped Spinetail |
|---|---|---|
| Tên Khoa Học | Cypseloides senex | Zoonavena sylvatica |
| Bộ | Caprimulgiformes | Caprimulgiformes |
| Họ | Apodidae | Apodidae |
| Tình Trạng Bảo Tồn | Least Concern | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 33,8 cm (13.3 in) | 22,1 cm (8.7 in) |
| Khối Lượng | 83,0 g (2.93 oz) | 13,0 g (0.46 oz) |
| Chế Độ Ăn | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … | Catches aerial plankton of small insects and spiders in fast sweeping flight; roosts in rock … |
| Số Trứng | 1-2 | 3-5 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
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
White-rumped Spinetail
Shrill, reedy twittering calls; thin whistled notes cascading rapidly in flight, carrying a faint metallic quality overhead.
Geographic Range & Migration
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
White-rumped Spinetail
Found in southwestern India (Western Ghats) and Sri Lanka. Resident in humid forest and forest edge in hills up to 1,800 m.
Tình Trạng Bảo Tồn
Great Dusky Swift
White-rumped Spinetail
How to Tell Them Apart
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 …
White-rumped Spinetail
Small; dark brown-black upperparts; bright white rump band strongly contrasting with dark back; underparts pale whitish; short spiny tail; South Asian forest species; white rump conspicuous in flight distinguishing it …
About These Birds
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.
White-rumped Spinetail
A small spinetail swift (10-11 cm) found in foothill and montane forests of the Indian subcontinent, from the Himalayas to the Western Ghats and Sri Lanka. Dark plumage with a white rump band and spine-tipped tail. Aerial insectivore. Nests behind waterfalls and in caves.