White-rumped Swiftlet vs Pallid Swift
Aerodramus spodiopygius 对比 Apus pallidus
Side-by-Side Comparison
| 属性 | White-rumped Swiftlet | Pallid Swift |
|---|---|---|
| 学名 | Aerodramus spodiopygius | Apus pallidus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 23.4 cm (9.2 in) | 33.4 cm (13.1 in) |
| 体重 | 7.4 g (0.26 oz) | 42.25 g (1.49 oz) |
| 食性 | Feeds on aerial plankton including tiny flies and spiders; forages in large noisy flocks above … | Aerial insectivore foraging continuously in flight, taking tiny flies, beetles, and ballooning spiders. |
| 产卵数 | 1-2 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
White-rumped Swiftlet
Rapid thin twittering; high 'tsit-tsit' notes over Pacific islands; echolocation clicks in caves; colonial; produces soft chattering in roost cavities; unremarkable call
Pallid Swift
Melodic, rolling trill with rich timbre; sustained musical phrase with slight variations on repeated delivery at dusk.
Geographic Range & Migration
White-rumped Swiftlet
Found across the southwestern Pacific including Fiji, Samoa, Tonga, and Vanuatu east to the Cook Islands. Resident from coast to mountains.
Pallid Swift
Breeds in the Mediterranean and North Africa east to Pakistan. Migratory; winters in sub-Saharan Africa from Senegal to Ethiopia.
保护状况
White-rumped Swiftlet
Pallid Swift
How to Tell Them Apart
White-rumped Swiftlet
Small; dark brownish-black upperparts with faint gloss; white rump patch contrasting sharply with dark back and tail; underparts pale greyish-white; forked tail; widespread Pacific species with diagnostically bright white rump.
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 …
About These Birds
White-rumped Swiftlet
一种小型金丝燕（体长10-11厘米），广泛分布于从俾斯麦群岛至斐济的西太平洋地区。属雨燕科（Apodidae），是太平洋金丝燕中分布最广者之一。
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。