Pygmy Swiftlet vs Great Dusky Swift
Collocalia troglodytes comparé à Cypseloides senex
Side-by-Side Comparison
| Attribut | Pygmy Swiftlet | Great Dusky Swift |
|---|---|---|
| Nom scientifique | Collocalia troglodytes | Cypseloides senex |
| Ordre | Caprimulgiformes | Caprimulgiformes |
| Famille | Apodidae | Apodidae |
| Statut de conservation | Least Concern | Least Concern |
| Longueur | — | — |
| Envergure | 18,6 cm (7.3 in) | 33,8 cm (13.3 in) |
| Poids | 5,55 g (0.20 oz) | 83,0 g (2.93 oz) |
| Régime alimentaire | Obligate aerial insectivore; catches minute flies, beetles, and aerial spiders while foraging near cave roosts. | 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
Pygmy Swiftlet
Extremely high, thin twittering; among highest-pitched calls of any bird; 'tseee-tseee' barely audible to adults; uses echolocation clicks in Philippine limestone caves
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
Pygmy Swiftlet
Endemic to the Philippines, found on Mindanao and adjacent islands. Resident in lowland forest and coastal caves. One of the smallest swiftlets.
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
Pygmy Swiftlet
Great Dusky Swift
How to Tell Them Apart
Pygmy Swiftlet
Tiny; dark blue-black upperparts with faint iridescence; white or pale buff rump band; underparts pale greyish-white; slightly forked tail; one of the smallest swiftlets in the Philippines; cave-nesting with pale …
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
Pygmy Swiftlet
The smallest swiftlet (9 cm), endemic to the Philippines. Dark grey-brown plumage. Aerial insectivore, foraging in small flocks over forest. Colonial cave nester. Despite being common, poorly studied due to the difficulty of distinguishing small, dark swiftlets in flight.
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.