Great Dusky Swift vs White-rumped Spinetail
Cypseloides senex verglichen mit Zoonavena sylvatica
Side-by-Side Comparison
| Merkmal | Great Dusky Swift | White-rumped Spinetail |
|---|---|---|
| Wissenschaftlicher Name | Cypseloides senex | Zoonavena sylvatica |
| Ordnung | Caprimulgiformes | Caprimulgiformes |
| Familie | Apodidae | Apodidae |
| Erhaltungsstatus | Least Concern | Least Concern |
| Länge | — | — |
| Flügelspannweite | 33,8 cm (13.3 in) | 22,1 cm (8.7 in) |
| Gewicht | 83,0 g (2.93 oz) | 13,0 g (0.46 oz) |
| Ernährung | 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 … |
| Gelegegröße | 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.
Erhaltungsstatus
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.