White-throated Swift vs Great Dusky Swift
Aeronautes saxatalis в сравнении с Cypseloides senex
Side-by-Side Comparison
| Характеристика | White-throated Swift | Great Dusky Swift |
|---|---|---|
| Научное название | Aeronautes saxatalis | Cypseloides senex |
| Отряд | Caprimulgiformes | Caprimulgiformes |
| Семейство | Apodidae | Apodidae |
| Охранный статус | Least Concern | Least Concern |
| Длина | — | — |
| Размах крыльев | 28,1 cm (11.1 in) | 33,8 cm (13.3 in) |
| Масса | 34,03 g (1.20 oz) | 83,0 g (2.93 oz) |
| Питание | Aerial insectivore relying entirely on flying insects (midges, gnats, small beetles) and airborne spiders. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| Размер кладки | 3-6 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Общие среды обитания
Нет
White-throated Swift only
Great Dusky Swift only
Song & Call Comparison
White-throated Swift
Sharp, whistled notes alternating with buzzy trills; crisp di-di-dit pattern repeated rhythmically during swift soaring flights.
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
White-throated Swift
Found in western North America from British Columbia south through the Rocky Mountains to Central America. Partially migratory northward.
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
White-throated Swift
Great Dusky Swift
How to Tell Them Apart
White-throated Swift
Black upperparts; bold white throat and white flanks extending to white central underparts; black sides of breast and belly create striking tricoloured pattern; white lateral tail spots; Western North 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
White-throated Swift
A medium-sized swift (15-17 cm) with striking black and white plumage, unique among North American swifts. White throat, breast, and flank patches contrast with black body. Found in canyons and cliffs of western North America. Aerial insectivore; resident in southern range.
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.