Great Dusky Swift vs Silver-rumped Spinetail
Cypseloides senex comparé à Rhaphidura leucopygialis
Side-by-Side Comparison
| Attribut | Great Dusky Swift | Silver-rumped Spinetail |
|---|---|---|
| Nom scientifique | Cypseloides senex | Rhaphidura leucopygialis |
| Ordre | Caprimulgiformes | Caprimulgiformes |
| Famille | Apodidae | Apodidae |
| Statut de conservation | Least Concern | Least Concern |
| Longueur | — | — |
| Envergure | 33,8 cm (13.3 in) | 23,2 cm (9.1 in) |
| Poids | 83,0 g (2.93 oz) | 13,65 g (0.48 oz) |
| Régime alimentaire | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … | Obligate aerial forager on small insects and airborne spiders; among the fastest-flying of all swift … |
| Taille de la couvée | 1-2 | -- |
| 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
Silver-rumped Spinetail
High, thin squeaking notes delivered at rapid pace; silvery twittering with brief pauses forming loose conversational chatter.
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.
Silver-rumped Spinetail
Found from Myanmar and the Thai-Malay Peninsula south through Sumatra and Borneo. Resident in lowland and hill forest. Uncommon.
Statut de conservation
Great Dusky Swift
Silver-rumped Spinetail
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 …
Silver-rumped Spinetail
Small; dark blackish-brown upperparts; silvery-white rump band gleaming in flight; underparts pale whitish-grey; short spiny tail tips; Sundaic forest specialist; silvery rather than clean white rump distinguishes from White-rumped Spinetail.
About These Birds
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.
Silver-rumped Spinetail
A small spinetail swift (10-11 cm) found in lowland forests from the Malay Peninsula through Sumatra and Borneo. Dark plumage with a conspicuous silvery-white rump. Spine-tipped tail. Aerial insectivore, often foraging in small flocks over forest canopy and rivers.