Palau Swiftlet vs Great Dusky Swift
Aerodramus pelewensis в сравнении с Cypseloides senex
Side-by-Side Comparison
| Характеристика | Palau Swiftlet | Great Dusky Swift |
|---|---|---|
| Научное название | Aerodramus pelewensis | Cypseloides senex |
| Отряд | Caprimulgiformes | Caprimulgiformes |
| Семейство | Apodidae | Apodidae |
| Охранный статус | Least Concern | Least Concern |
| Длина | — | — |
| Размах крыльев | 21,5 cm (8.5 in) | 33,8 cm (13.3 in) |
| Масса | 13,3 g (0.47 oz) | 83,0 g (2.93 oz) |
| Питание | Aerial plankton specialist catching tiny flies, gnats, and airborne spiders in tight acrobatic flight. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Размер кладки | 1 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Palau Swiftlet
Rapid thin twittering; high 'tsit' notes over Palau islands; audible echolocation clicks in cave and building roosts; endemic island species; calls weakly in small flocks
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
Palau Swiftlet
Endemic to the Palau Islands in Micronesia. Resident on all major islands; nests in limestone caves. Small but stable population.
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
Palau Swiftlet
Great Dusky Swift
How to Tell Them Apart
Palau Swiftlet
Small; dark grey-brown upperparts; pale buff-grey rump band; underparts pale greyish-white; forked tail; Palau Island endemic; closely resembles Caroline Swiftlet but restricted to Palau and differing in subtle measurements.
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
Palau Swiftlet
A small swiftlet (10-11 cm) endemic to the Palau archipelago in the western Pacific. Dark plumage. Aerial insectivore, foraging over forested limestone islands. Colonial cave nester. Population restricted to the Palau island chain. Classified as Near Threatened.
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.