Spotted Nightjar vs Ladder-tailed Nightjar
Eurostopodus argus 比較対象 Hydropsalis climacocerca
Side-by-Side Comparison
| 属性 | Spotted Nightjar | Ladder-tailed Nightjar |
|---|---|---|
| 学名 | Eurostopodus argus | Hydropsalis climacocerca |
| 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) | 29.9 cm (11.8 in) |
| 体重 | 102.5 g (3.62 oz) | 48.0 g (1.69 oz) |
| 食性 | Aerial insectivore; hawks large moths, beetles, and flying insects at dusk and dawn over Australian … | Nocturnal aerial insectivore; hawks insects over Amazonian river margins and forest clearings. |
| 一腹卵数 | 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
Ladder-tailed Nightjar
Resonant churring trill over Amazonian rivers; 'churr-churr' with hollow quality; calls from riverside sandbars and beaches at dusk; distinctive riverside habitat singer
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.
Ladder-tailed Nightjar
Resident of sandy riverbanks, open woodland, and savanna in the Amazon basin from Colombia and Peru south to Bolivia and central Brazil.
保全状況
Spotted Nightjar
Ladder-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 …
Ladder-tailed Nightjar
Male brown and buff mottled above; white throat; graduated tail with white ladder pattern on inner webs of outer rectrices diagnostic; white wing patches. Female has buff throat; tail barred …
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。
Ladder-tailed Nightjar
A small Caprimulgidae nightjar (~48 g) of rivers, oxbow lakes, and riverine forest edges throughout the Amazon Basin. Males possess white-banded, step-like outer tail feathers giving a ladder appearance. Roosts on branches and sandy banks near water. Feeds on insects at night. Least Concern.