Caroline Swiftlet vs Pallid Swift
Aerodramus inquietus 对比 Apus pallidus
Side-by-Side Comparison
| 属性 | Caroline Swiftlet | Pallid Swift |
|---|---|---|
| 学名 | Aerodramus inquietus | Apus pallidus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 22.8 cm (9.0 in) | 33.4 cm (13.1 in) |
| 体重 | 11.0 g (0.39 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
Caroline Swiftlet
Thin twittering calls; 'tsit-tsit' over Caroline Islands; echolocation clicks in cave roosts; moderate-pitched for swiftlet; produces soft chattering at colonial nesting sites
Pallid Swift
Melodic, rolling trill with rich timbre; sustained musical phrase with slight variations on repeated delivery at dusk.
Geographic Range & Migration
Caroline Swiftlet
Found across the Caroline Islands of Micronesia including Pohnpei and Chuuk. Resident in lowland forest and cave systems.
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
Caroline Swiftlet
Pallid Swift
How to Tell Them Apart
Caroline Swiftlet
Small; dark grey-brown upperparts; pale buff rump band; underparts pale greyish-white; forked tail; Micronesian endemic from Caroline Islands; very similar to Palau Swiftlet but distributed on a distinct island group.
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
Caroline Swiftlet
一种小型金丝燕（体长10-11厘米），特产于密克罗尼西亚卡罗林群岛（波纳佩岛、科斯雷岛）。体羽深色。属雨燕科（Apodidae），是太平洋岛屿的特有种。
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。