Silky-tailed Nightjar vs Spotted Nightjar
Antrostomus sericocaudatus 比較対象 Eurostopodus argus
Side-by-Side Comparison
| 属性 | Silky-tailed Nightjar | Spotted Nightjar |
|---|---|---|
| 学名 | Antrostomus sericocaudatus | Eurostopodus argus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Caprimulgidae | Caprimulgidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 32.1 cm (12.6 in) | 42.7 cm (16.8 in) |
| 体重 | 77.5 g (2.73 oz) | 102.5 g (3.62 oz) |
| 食性 | Hawks moths and beetles in nocturnal aerial sallies over South American lowland and foothill forest. | 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
Silky-tailed Nightjar
Whistled, rolling 'pwee-pwee-pwee'; melodic phrase from Amazonian forest; calls persistently at dusk; slightly slurred delivery; alarm a sudden sharp note
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
Silky-tailed Nightjar
Resident of lowland and foothill forest in southern Brazil (São Paulo, Minas Gerais, Santa Catarina) and adjacent Paraguay and Argentina.
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
Silky-tailed Nightjar
Spotted Nightjar
How to Tell Them Apart
Silky-tailed Nightjar
Brown and buff mottled above with dark vermiculations; white gorget in male; outer tail feathers with silky-white inner webs giving smooth appearance; pale buff below; female with buff gorget and …
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
Silky-tailed Nightjar
A medium Caprimulgidae nightjar (~78 g) of humid lowland Atlantic Forest and adjacent cerrado edges in central and southeastern Brazil and adjacent Paraguay. Named for its silky-textured outer tail feathers. Cryptic brown plumage. Nocturnal insectivore. Rarely recorded; biology little known. Least Concern.
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。