Christmas Island Swiftlet vs Great Dusky Swift
Collocalia natalis 对比 Cypseloides senex
Side-by-Side Comparison
| 属性 | Christmas Island Swiftlet | Great Dusky Swift |
|---|---|---|
| 学名 | Collocalia natalis | Cypseloides senex |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保护状况 | Not Evaluated | Least Concern |
| 体长 | — | — |
| 翼展 | — | 33.8 cm (13.3 in) |
| 体重 | 4.75 g (0.17 oz) | 83.0 g (2.93 oz) |
| 食性 | Aerial plankton feeder taking tiny midges, fungus gnats, and ballooning spiders in rapid coursing flights. | Feeds on aerial plankton of tiny insects and spiders; entire diet captured during non-stop aerial … |
| 产卵数 | 2 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Christmas Island Swiftlet
Very high, thin twittering; 'chip' notes over Christmas Island forest; audible echolocation clicks in sea cave roosts; one of smallest swiftlets; barely audible to humans
Great Dusky Swift
Loud, churring trill; harsher and louder than other Cypseloides; calls over Iguacu Falls and major Neotropical waterfalls; buzzy 'bzzzt-bzzzt' in aerial groups
Geographic Range & Migration
Christmas Island Swiftlet
Endemic to Christmas Island in the eastern Indian Ocean. Resident in forested areas. Small population vulnerable to introduced predators.
Great Dusky Swift
Found in eastern South America from Venezuela and the Guianas south to Bolivia and Paraguay. Resident near rocky cliffs and waterfalls.
保护状况
Christmas Island Swiftlet
Great Dusky Swift
How to Tell Them Apart
Christmas Island Swiftlet
Tiny; dark brownish-black upperparts with minimal gloss; pale grey-buff rump band; greyish-white underparts; forked tail; Christmas Island endemic; differs from Cave Swiftlet in duller upperparts and restricted oceanic island range.
Great Dusky Swift
Very large; entirely dark sooty-brown with pale grey forehead and chin scaling; slightly paler underparts; broad wings; largest Cypseloides swift; South American waterfall specialist with dusky uniform plumage and imposing …
About These Birds
Christmas Island Swiftlet
圣诞岛金丝燕(Collocalia natalis)是一种体长12厘米的小型金丝燕，为印度洋圣诞岛特有种。深色羽毛，叉形尾。空中捕食昆虫，在岛上的洞穴中筑巢，是圣诞岛少数特有鸟类之一。
Great Dusky Swift
大暗色雨燕分布于巴西和阿根廷，在大型瀑布附近繁殖的雨燕。