Ashy-tailed Swift vs Great Dusky Swift
Chaetura andrei comparé à Cypseloides senex
Side-by-Side Comparison
| Attribut | Ashy-tailed Swift | Great Dusky Swift |
|---|---|---|
| Nom scientifique | Chaetura andrei | Cypseloides senex |
| Ordre | Caprimulgiformes | Caprimulgiformes |
| Famille | Apodidae | Apodidae |
| Statut de conservation | Vulnerable | Least Concern |
| Longueur | — | — |
| Envergure | 22,3 cm (8.8 in) | 33,8 cm (13.3 in) |
| Poids | 17,1 g (0.60 oz) | 83,0 g (2.93 oz) |
| Régime alimentaire | Aerial insectivore foraging continuously in flight, taking tiny flies, beetles, and ballooning spiders. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Taille de la couvée | -- | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Ashy-tailed Swift
Dry rattling chatter with sharp staccato onset; brief bursts of clicking notes followed by descending hissing sound.
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
Ashy-tailed Swift
Found in eastern Brazil, Bolivia, Paraguay, and northern Argentina. Partially migratory; moves north in austral winter. Lowland forest.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
Statut de conservation
Ashy-tailed Swift
Great Dusky Swift
How to Tell Them Apart
Ashy-tailed Swift
Small; dark sooty-brown overall; distinctly pale ashy-grey rump and tail contrasting with dark body; underparts dark grey-brown; ashy rump and tail the defining feature separating it from other South American …
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
Ashy-tailed Swift
A small swift (11-12 cm) of lowland forests in Venezuela, the Guianas, and Trinidad, with a separate population in southeastern Brazil. Dark plumage with an ashy-grey rump and undertail. Spine-tipped tail. Aerial insectivore. Nests in hollow palms and chimneys.
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.