Atiu Swiftlet vs Black Spinetail
Aerodramus sawtelli so với Telacanthura melanopygia
Side-by-Side Comparison
| Thuộc Tính | Atiu Swiftlet | Black Spinetail |
|---|---|---|
| Tên Khoa Học | Aerodramus sawtelli | Telacanthura melanopygia |
| Bộ | Caprimulgiformes | Caprimulgiformes |
| Họ | Apodidae | Apodidae |
| Tình Trạng Bảo Tồn | Vulnerable | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 23,2 cm (9.1 in) | 32,4 cm (12.8 in) |
| Khối Lượng | 8,6 g (0.30 oz) | 52,0 g (1.83 oz) |
| Chế Độ Ăn | 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. |
| Số Trứng | 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.
Tình Trạng Bảo Tồn
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
A small swiftlet (10 cm) endemic to the island of Atiu in the Cook Islands of the South Pacific. Dark plumage. Aerial insectivore. Nests in small caves and sinkholes (makatea) on the raised coral island. One of the most range-restricted swiftlets, with a tiny population.
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.