Spotted Nightjar vs Spot-tailed Nightjar
Eurostopodus argus 比較対象 Hydropsalis maculicaudus
Side-by-Side Comparison
| 属性 | Spotted Nightjar | Spot-tailed Nightjar |
|---|---|---|
| 学名 | Eurostopodus argus | Hydropsalis maculicaudus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Caprimulgidae | Caprimulgidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 42.7 cm (16.8 in) | 25.8 cm (10.2 in) |
| 体重 | 102.5 g (3.62 oz) | 32.125 g (1.13 oz) |
| 食性 | Aerial insectivore; hawks large moths, beetles, and flying insects at dusk and dawn over Australian … | Catches flying insects in nocturnal aerial pursuit over Central and South American grassland. |
| 一腹卵数 | 1 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
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
Spot-tailed Nightjar
Soft, rhythmic churring; gentle 'trrr-trrr' from humid grassland; calls low from ground; quieter than most nightjars; alarm a subtle 'chek'; small and inconspicuous
Geographic Range & Migration
Spotted Nightjar
Resident and partial migrant of open woodland, grassland, and scrub across mainland Australia and migrating to New Guinea and Indonesia in winter.
Spot-tailed Nightjar
Resident of open cerrado, scrub, and forest edge in interior South America from Venezuela and the Guianas south to Bolivia, Brazil, and Paraguay.
保全状況
Spotted Nightjar
Spot-tailed Nightjar
How to Tell Them Apart
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 …
Spot-tailed Nightjar
Small; brown and buff mottled above; pale buff below with dark barring; white throat in male; distinctive white spots on rounded tail distinguishing it from similar Hydropsalis; buff throat in …
About These Birds
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。
Spot-tailed Nightjar
A very small Caprimulgidae nightjar (~32 g) of open cerrado, llanos, and grass savanna in Central America and tropical South America. Named for white spots on the outer tail. Extremely secretive; roosts on the ground. Feeds on tiny insects at dusk and dawn. Less vocal than related species; Least Concern.