Pallid Swift vs Vaux's Swift
Apus pallidus 对比 Chaetura vauxi
Side-by-Side Comparison
| 属性 | Pallid Swift | Vaux's Swift |
|---|---|---|
| 学名 | Apus pallidus | Chaetura vauxi |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 33.4 cm (13.1 in) | 22.3 cm (8.8 in) |
| 体重 | 42.25 g (1.49 oz) | 18.033333333333335 g (0.64 oz) |
| 食性 | Aerial insectivore foraging continuously in flight, taking tiny flies, beetles, and ballooning spiders. | Exclusively aerial insectivore catching small flying insects and spiders drifting in aerial plankton at altitude. |
| 产卵数 | 1-4 | 1-7 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Pallid Swift
Melodic, rolling trill with rich timbre; sustained musical phrase with slight variations on repeated delivery at dusk.
Vaux's Swift
Soft, high sibilant whisper followed by ticking notes; delicate trill barely audible beyond immediate roosting vicinity.
Geographic Range & Migration
Pallid Swift
Breeds in the Mediterranean and North Africa east to Pakistan. Migratory; winters in sub-Saharan Africa from Senegal to Ethiopia.
Vaux's Swift
Breeds in western North America from Alaska south to Central America. Migrates to winter in Venezuela and northwestern South America.
保护状况
Pallid Swift
Vaux's Swift
How to Tell Them Apart
Pallid Swift
Medium-large; pale brownish-grey overall, distinctly paler than Common Swift; larger pale throat patch; wing coverts show pale scaly edges; Mediterranean and Middle Eastern species; pale sandy-brown tone separates it from …
Vaux's Swift
Small; dark sooty-brown upperparts; pale grey rump slightly paler than back; underparts pale greyish-brown; short spiny tail; smaller and paler-bellied than Chimney Swift; Pacific coast North American species with subtly …
About These Birds
Pallid Swift
淡色雨燕在地中海沿岸和北非繁殖，颜色比普通雨燕更淡。
Vaux's Swift
沃氏雨燕 (Chaetura vauxi)，体长约11厘米，为北美最小的雨燕之一。体羽褐灰色，喉和腹部较淡，腰部略浅，尾短。繁殖于北美洲西部，冬季迁至中美洲和南美洲。以飞行昆虫为食，常在烟囱中营巢。