Atiu Swiftlet vs Chestnut-collared Swift
Aerodramus sawtelli 对比 Streptoprocne rutila
Side-by-Side Comparison
| 属性 | Atiu Swiftlet | Chestnut-collared Swift |
|---|---|---|
| 学名 | Aerodramus sawtelli | Streptoprocne rutila |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Vulnerable | Least Concern |
| 体长 | — | — |
| 翼展 | 23.2 cm (9.1 in) | 26.0 cm (10.2 in) |
| 体重 | 8.6 g (0.30 oz) | 21.8 g (0.77 oz) |
| 食性 | Small aerial insectivore feeding on minute flying insects and spiders; forages over forest canopy and … | Entirely airborne feeder on tiny flies, gnats, and airborne arachnids; one of the most aerial … |
| 产卵数 | 2 | 2 |
| 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
Chestnut-collared Swift
High, screaming trill; rapid 'scree-scree' in flight; shrill and penetrating; calls over Neotropical mountains and canyon edges; alarm a rapid screeching chatter
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.
Chestnut-collared Swift
Found from Mexico and the Caribbean south through Central America and South America to Argentina. Resident in highlands near mountain cliffs.
保护状况
Atiu Swiftlet
Chestnut-collared 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.
Chestnut-collared Swift
Dark blackish-brown body with diagnostic rich chestnut collar encircling entire neck; collar bold and complete; underparts slightly paler brown; small swift with striking warm-toned neck band contrasting vividly with dark …
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。
Chestnut-collared Swift
栗领雨燕栖息于中美洲和南美洲北部的山地。