Atiu Swiftlet vs Pallid Swift
Aerodramus sawtelli 对比 Apus pallidus
Side-by-Side Comparison
| 属性 | Atiu Swiftlet | Pallid Swift |
|---|---|---|
| 学名 | Aerodramus sawtelli | Apus pallidus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Vulnerable | Least Concern |
| 体长 | — | — |
| 翼展 | 23.2 cm (9.1 in) | 33.4 cm (13.1 in) |
| 体重 | 8.6 g (0.30 oz) | 42.25 g (1.49 oz) |
| 食性 | Small aerial insectivore feeding on minute flying insects and spiders; forages over forest canopy and … | Aerial insectivore foraging continuously in flight, taking tiny flies, beetles, and ballooning spiders. |
| 产卵数 | 2 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Atiu Swiftlet
Very high thin twittering; 'tsit' calls over Cook Islands; audible echolocation clicks inside Atiu makatea caves; vulnerable endemic; vocal near cave entrances only
Pallid Swift
Melodic, rolling trill with rich timbre; sustained musical phrase with slight variations on repeated delivery at dusk.
Geographic Range & Migration
Atiu Swiftlet
Endemic to Atiu Island in the southern Cook Islands. Resident on this single island; nests in limestone caves. Small and vulnerable population.
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
Atiu Swiftlet
Pallid Swift
How to Tell Them Apart
Atiu Swiftlet
Tiny; dark grey-brown upperparts; pale grey rump band; underparts whitish-grey; forked tail; Cook Islands endemic restricted to Atiu Island; extremely small range and vulnerable status; plumage similar to Polynesian Swiftlet.
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
Atiu Swiftlet
一种小型金丝燕（体长10厘米），特产于南太平洋库克群岛的阿提乌岛。体羽深色。属雨燕科（Apodidae），是极为局限分布的特有种，种群数量需要保护。
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。