Slender-tailed Nightjar vs Spotted Nightjar
Caprimulgus clarus 比較対象 Eurostopodus argus
Side-by-Side Comparison
| 属性 | Slender-tailed Nightjar | Spotted Nightjar |
|---|---|---|
| 学名 | Caprimulgus clarus | Eurostopodus argus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Caprimulgidae | Caprimulgidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 29.6 cm (11.7 in) | 42.7 cm (16.8 in) |
| 体重 | 43.0 g (1.52 oz) | 102.5 g (3.62 oz) |
| 食性 | Nocturnal aerial insectivore specialising in large moths and flying beetles, caught in slow erratic hunting … | Aerial insectivore; hawks large moths, beetles, and flying insects at dusk and dawn over Australian … |
| 一腹卵数 | 2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Slender-tailed Nightjar
Rapid churring trill; 'trrr-trrr' at steady pace; calls from East African dry scrub at night; lighter than Long-tailed Nightjar; alarm a quiet 'chek'
Spotted Nightjar
Loud churring 'good-lord-deliver-us' repeated at dusk; melodic bubbling quality; also emits hollow 'cow-cow-cow' series and soft frog-like croaking
Geographic Range & Migration
Slender-tailed Nightjar
Found from Angola and the DRC south through Zambia and Zimbabwe to South Africa. Resident in woodland and savanna near rocky outcrops.
Spotted Nightjar
Resident and partial migrant of open woodland, grassland, and scrub across mainland Australia and migrating to New Guinea and Indonesia in winter.
保全状況
Slender-tailed Nightjar
Spotted Nightjar
How to Tell Them Apart
Slender-tailed Nightjar
Pale brown upperparts with black streaks and buff-white spotting; whitish supercilium; white throat patch; underparts buff barred brown; males have elongated but narrower tail feathers than Long-tailed Nightjar.
Spotted Nightjar
Cryptically mottled grey-brown, rufous, and black with intricate vermiculations; distinctive large white spots on wing coverts; white throat patch; no white in wings or tail. Sexes similar with slight pattern …
About These Birds
Slender-tailed Nightjar
体長24〜27cmの東・南アフリカの開けた草地・林地に生息するヨタカ。ナガオヨタカより淡色。
Spotted Nightjar
オーストラリア本土のスピニフェックス草原に生息するヨタカで、体重103g。