Forbes-Watson's Swift vs Great Dusky Swift
Apus berliozi مقارنةً بـ Cypseloides senex
Side-by-Side Comparison
| السمة | Forbes-Watson's Swift | Great Dusky Swift |
|---|---|---|
| الاسم العلمي | Apus berliozi | Cypseloides senex |
| الرتبة | Caprimulgiformes | Caprimulgiformes |
| الفصيلة | Apodidae | Apodidae |
| حالة الحفاظ | Least Concern | Least Concern |
| الطول | — | — |
| طول الجناح | 34,0 cm (13.4 in) | 33,8 cm (13.3 in) |
| الوزن | 43,166666666666664 g (1.52 oz) | 83,0 g (2.93 oz) |
| النظام الغذائي | Obligate aerial feeder on small insects and arachnids; catches prey in a wide gape during … | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| عدد البيض في الوضع | 2 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Forbes-Watson's Swift
Rapid, buzzy chatter descending at end; rough staccato notes spilling quickly with emphatic final chip before silence.
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
Forbes-Watson's Swift
Breeds in the Arabian Peninsula and East Africa from Somalia south to Tanzania. Partially migratory; range and taxonomy incompletely understood.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
حالة الحفاظ
Forbes-Watson's Swift
Great Dusky Swift
How to Tell Them Apart
Forbes-Watson's Swift
Dark sooty-brown overall with pale buff throat patch; underparts slightly paler brown; Socotra Island and East African coast species; plumage similar to African Swift but slightly paler throat and restricted …
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
Forbes-Watson's Swift
A medium-sized swift (16-17 cm) found in arid coastal regions from the Horn of Africa to the Arabian Peninsula and northwestern Indian Ocean islands. Pale brown plumage with a large white throat patch. Aerial insectivore. Named after the German zoologist Rudolf Berlioz.
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.