Blyth's Swift vs Great Dusky Swift
Apus leuconyx в сравнении с Cypseloides senex
Side-by-Side Comparison
| Характеристика | Blyth's Swift | Great Dusky Swift |
|---|---|---|
| Научное название | Apus leuconyx | Cypseloides senex |
| Отряд | Caprimulgiformes | Caprimulgiformes |
| Семейство | Apodidae | Apodidae |
| Охранный статус | Not Evaluated | Least Concern |
| Длина | — | — |
| Размах крыльев | — | 33,8 cm (13.3 in) |
| Масса | 42,949999999999996 g (1.52 oz) | 83,0 g (2.93 oz) |
| Питание | Obligate aerial insectivore; takes small flies, beetles, and aerial spiders in swooping fast-flight passes. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Размер кладки | 2-3 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Blyth's Swift
Loud, piercing screech with shrill metallic quality; powerful prolonged calls audible from considerable distances in open sky.
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
Blyth's Swift
Found from Central Asia and the Himalayas east to China and southeastern Russia. Migratory; winters in South and Southeast Asia.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
Охранный статус
Blyth's Swift
Great Dusky Swift
How to Tell Them Apart
Blyth's Swift
Dark blackish-brown upperparts; white rump patch; white throat; underparts dark brown; deeply forked tail; recently described species closely related to Pacific Swift; separation based on molecular and biometric characters.
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
Blyth's Swift
A medium-sized swift found in montane regions of Central and East Asia. Dark plumage with a white chin patch. Aerial insectivore, foraging over mountain valleys and cliffs. Named after Edward Blyth. Breeds in rock crevices on high cliffs. Poorly known migratory patterns.
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.