Seychelles Swiftlet vs Great Dusky Swift
Aerodramus elaphrus so với Cypseloides senex
Side-by-Side Comparison
| Thuộc Tính | Seychelles Swiftlet | Great Dusky Swift |
|---|---|---|
| Tên Khoa Học | Aerodramus elaphrus | Cypseloides senex |
| Bộ | Caprimulgiformes | Caprimulgiformes |
| Họ | Apodidae | Apodidae |
| Tình Trạng Bảo Tồn | Vulnerable | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 22,6 cm (8.9 in) | 33,8 cm (13.3 in) |
| Khối Lượng | 11,266666666666666 g (0.40 oz) | 83,0 g (2.93 oz) |
| Chế Độ Ăn | Feeds aerially on tiny flying insects and drifting spiders; often forages in mixed-species flocks over … | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Số Trứng | 1 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Seychelles Swiftlet only
Great Dusky Swift only
Không
Song & Call Comparison
Seychelles Swiftlet
Rapid twittering; thin 'tsit-tsit' over Seychelles islands; audible echolocation clicks in caves; endangered endemic; calls weakly in small flocks over forest and coast
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
Seychelles Swiftlet
Endemic to the Seychelles Islands in the western Indian Ocean. Resident on the main granitic islands including Mahé. Nests in sea caves.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
Tình Trạng Bảo Tồn
Seychelles Swiftlet
Great Dusky Swift
How to Tell Them Apart
Seychelles Swiftlet
Small; dark brownish-grey upperparts with slight gloss; pale grey-buff rump band; underparts whitish-grey; forked tail; Seychelles endemic and vulnerable due to restricted range; slightly larger and less glossy than sympatric …
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
Seychelles Swiftlet
A small swiftlet (10-11 cm) endemic to the Seychelles archipelago in the Indian Ocean. Dark grey-brown plumage with a pale rump. Aerial insectivore, foraging over forest and coastal areas. Colonial cave nester. Population under 10,000 individuals. Classified as Vulnerable.
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.