Christmas Island Swiftlet vs White-collared Swift
Collocalia natalis 比較対象 Streptoprocne zonaris
Side-by-Side Comparison
| 属性 | Christmas Island Swiftlet | White-collared Swift |
|---|---|---|
| 学名 | Collocalia natalis | Streptoprocne zonaris |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Apodidae | Apodidae |
| 保全状況 | Not Evaluated | Least Concern |
| 体長 | — | — |
| 翼開長 | — | 42.5 cm (16.7 in) |
| 体重 | 4.75 g (0.17 oz) | 106.45 g (3.75 oz) |
| 食性 | Aerial plankton feeder taking tiny midges, fungus gnats, and ballooning spiders in rapid coursing flights. | Obligate aerial insectivore; gathers small flying insects, winged ants, and airborne spiders during flight. |
| 一腹卵数 | 2 | 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
White-collared Swift
Loud, screaming 'shreee-shreee'; powerful screeching trill; calls from large flocks over mountains; very audible; one of the loudest Neotropical swifts; alarm a harsh rattle
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.
White-collared Swift
Found from Mexico south through Central America to South America east of the Andes, reaching Bolivia and southern Brazil. Often in large flocks.
保全状況
Christmas Island Swiftlet
White-collared 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.
White-collared Swift
Large; glossy blue-black plumage with bold broad white collar encircling entire neck; collar clean and complete; underparts black; large slightly forked tail; among the most recognisable Neotropical swifts due to …
About These Birds
Christmas Island Swiftlet
A small swiftlet (12 cm) endemic to Christmas Island in the Indian Ocean. Dark plumage with a slightly forked tail. Aerial insectivore, foraging over the island's rainforest canopy. Colonial cave nester. Population estimated at 6,000-8,000 individuals. Classified as Vulnerable.
White-collared Swift
ホワイトカラードスウィフトはラテンアメリカ全域の山岳地帯に広く分布し、白い首輪が特徴的な大型のアマツバメである。