Atiu Swiftlet vs Black Spinetail
Aerodramus sawtelli 비교 대상 Telacanthura melanopygia
Side-by-Side Comparison
| 속성 | Atiu Swiftlet | Black Spinetail |
|---|---|---|
| 학명 | Aerodramus sawtelli | Telacanthura melanopygia |
| 목 | Caprimulgiformes | Caprimulgiformes |
| 과 | Apodidae | Apodidae |
| 보전 상태 | Vulnerable | Least Concern |
| 체장 | — | — |
| 날개 폭 | 23.2 cm (9.1 in) | 32.4 cm (12.8 in) |
| 체중 | 8.6 g (0.30 oz) | 52.0 g (1.83 oz) |
| 식성 | Small aerial insectivore feeding on minute flying insects and spiders; forages over forest canopy and … | High-speed aerial insectivore catching small flying insects and aerial spiders during fast sustained flight. |
| 산란 수 | 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
Black Spinetail
Deep, resonant chattering with gravelly undertones; series of rough churring notes interspersed with sharp screaming calls.
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.
Black Spinetail
Found in West and Central Africa from Nigeria and Cameroon east to Uganda. Resident in lowland rainforest and forest edge.
보전 상태
Atiu Swiftlet
Black Spinetail
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.
Black Spinetail
Large; entirely black plumage with slight gloss; black rump unlike white-rumped congeners; underparts dark; spiny tail; West African forest species; all-black coloration with no contrasting markings distinguishes it from all …
About These Birds
Atiu Swiftlet
남태평양 쿡 제도의 아티우 섬에 고유하게 서식하는 작은 칼새류(10cm). 어두운 깃털. 공중 식충성이다.
Black Spinetail
A medium-sized spinetail swift (14-15 cm) of lowland rainforests in West and Central Africa. All-dark plumage. Spine-tipped tail for bracing against tree trunks. Aerial insectivore, foraging above the forest canopy. Nests inside hollow trees. Uncommon and seldom observed.