Indian Swiftlet vs Great Dusky Swift
Aerodramus unicolor مقارنةً بـ Cypseloides senex
Side-by-Side Comparison
| السمة | Indian Swiftlet | Great Dusky Swift |
|---|---|---|
| الاسم العلمي | Aerodramus unicolor | Cypseloides senex |
| الرتبة | Caprimulgiformes | Caprimulgiformes |
| الفصيلة | Apodidae | Apodidae |
| حالة الحفاظ | Least Concern | Least Concern |
| الطول | — | — |
| طول الجناح | 22,7 cm (8.9 in) | 33,8 cm (13.3 in) |
| الوزن | 11,0 g (0.39 oz) | 83,0 g (2.93 oz) |
| النظام الغذائي | Tiny aerial insectivore taking small flying insects and spiders; congregates where insects emerge over water. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| عدد البيض في الوضع | 2 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Indian Swiftlet
Rapid, thin twittering; 'tsit-tsit' calls over South Indian hills; audible echolocation clicks in cave roosts; colonial; calls softly in flight; noisy at roost entrances
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
Indian Swiftlet
Found in Sri Lanka and southwestern India. Resident in hills and lowlands, nesting in rock crevices on cliff faces up to 2,000 m 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
Indian Swiftlet
Great Dusky Swift
How to Tell Them Apart
Indian Swiftlet
Small; uniformly dark blackish-brown throughout with minimal gloss; rump barely paler than back or concolorous; underparts dark grey-brown; forked tail; South Indian and Sri Lankan endemic with exceptionally uniform dark …
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
Indian Swiftlet
A small swiftlet (11-12 cm) found across the Indian subcontinent and Sri Lanka. Dark grey-brown plumage with slightly paler underparts. Aerial insectivore, foraging over forests, towns, and agricultural land. Colonial nester in caves and buildings. Uses simple echolocation clicks.
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.