Great Dusky Swift vs Biscutate Swift
Cypseloides senex 对比 Streptoprocne biscutata
Side-by-Side Comparison
| 属性 | Great Dusky Swift | Biscutate Swift |
|---|---|---|
| 学名 | Cypseloides senex | Streptoprocne biscutata |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 33.8 cm (13.3 in) | 38.4 cm (15.1 in) |
| 体重 | 83.0 g (2.93 oz) | 106.67999999999999 g (3.76 oz) |
| 食性 | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … | Aerial forager on tiny insects and wind-dispersed spiders; forages near water surfaces where insects concentrate. |
| 产卵数 | 1-2 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
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
Biscutate Swift
Loud, screeching trill; powerful 'schreeee' calls; similar to White-collared Swift but slightly lower; calls in large flocks over Brazilian mountains and waterfalls
Geographic Range & Migration
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
Biscutate Swift
Found in Brazil, Bolivia, and Paraguay in eastern South America. Resident in forest and open terrain; nests on rock faces.
保护状况
Great Dusky Swift
Biscutate Swift
How to Tell Them Apart
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 …
Biscutate Swift
Large; blackish-brown with white collar interrupted at centre of nape creating two white patches rather than a complete ring; South American species readily distinguished from White-collared Swift by broken collar …
About These Birds
Great Dusky Swift
大暗色雨燕分布于巴西和阿根廷，在大型瀑布附近繁殖的雨燕。
Biscutate Swift
双盾雨燕栖息于巴西东部山地，以独特的两片白色盾状纹为特征的雨燕。