Great Dusky Swift vs Fork-tailed Palm Swift
Cypseloides senex 비교 대상 Tachornis squamata
Side-by-Side Comparison
| 속성 | Great Dusky Swift | Fork-tailed Palm Swift |
|---|---|---|
| 학명 | Cypseloides senex | Tachornis squamata |
| 목 | Caprimulgiformes | Caprimulgiformes |
| 과 | Apodidae | Apodidae |
| 보전 상태 | Least Concern | Least Concern |
| 체장 | — | — |
| 날개 폭 | 33.8 cm (13.3 in) | 20.7 cm (8.1 in) |
| 체중 | 83.0 g (2.93 oz) | 10.4 g (0.37 oz) |
| 식성 | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … | Obligate aerial insectivore; takes small flies, beetles, and aerial spiders in swooping fast-flight passes. |
| 산란 수 | 1-2 | 2-4 |
| 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
Fork-tailed Palm Swift
Loud, penetrating scream cutting above all noise; strident series of shrill descending notes, powerful for the bird's size.
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.
Fork-tailed Palm Swift
Found in the Amazon basin from Venezuela and the Guianas south to Peru, Bolivia, and Brazil. Resident near Mauritia palm swamps.
보전 상태
Great Dusky Swift
Fork-tailed Palm Swift
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 …
Fork-tailed Palm Swift
Tiny; dark brown-black upperparts; white rump patch; underparts whitish with dark flanks; deeply forked tail; Amazonian species closely resembling Antillean Palm Swift; nests in Mauritia palm fronds; white rump and …
About These Birds
Great Dusky Swift
18–20 cm의 대형 칼새로 브라질 동남부·파라과이 동부·아르헨티나 북동부에 서식. 어두운 그을린 갈색 깃털. 삼림 협곡과 폭포 위를 날며 먹이를 구하는 공중 곤충식성. 폭포 뒤에 대규모 집단으로 둥지를 튼다. Cypseloides 속의 가장 큰 종.
Fork-tailed Palm Swift
A small swift (12-13 cm) found in open country and palm savannas from Central America to southern Brazil and Trinidad. Dark plumage. Long, deeply forked tail. Aerial insectivore, closely associated with various palm species, nesting inside hanging dead palm fronds.