Cook's Swift vs Great Dusky Swift
Apus cooki comparado con Cypseloides senex
Side-by-Side Comparison
| Atributo | Cook's Swift | Great Dusky Swift |
|---|---|---|
| Nombre científico | Apus cooki | Cypseloides senex |
| Orden | Caprimulgiformes | Caprimulgiformes |
| Familia | Apodidae | Apodidae |
| Estado de conservación | Not Evaluated | Least Concern |
| Longitud | — | — |
| Envergadura | — | 33,8 cm (13.3 in) |
| Peso | 42,949999999999996 g (1.52 oz) | 83,0 g (2.93 oz) |
| Dieta | Catches aerial plankton — tiny midges, gnats, and ballooning spiders — continuously during soaring flight. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Tamaño de la puesta | -- | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Cook's Swift
Bright, flute-like series of liquid notes; clear melodic phrase ascending slightly then resolving on a sustained pure tone.
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
Cook's Swift
Found from southern Thailand through the Thai-Malay Peninsula to Sumatra, Borneo, and adjacent islands. Resident in 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.
Estado de conservación
Cook's Swift
Great Dusky Swift
How to Tell Them Apart
Cook's Swift
Dark sooty-brown upperparts; white rump patch; pale white throat; dark underparts; deeply forked tail; recently split taxon from Pacific Swift complex; plumage essentially identical to close relatives, distinguished primarily by …
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
Cook's Swift
A medium-sized swift (16-17 cm) found in montane forests from the Malay Peninsula through Southeast Asia to southern China. Dark plumage with a pale throat. Aerial insectivore. Named after Frederick Cook. Until recently considered conspecific with Pacific Swift.
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.