Silky-tailed Nightjar vs Papuan Nightjar
Antrostomus sericocaudatus 比較対象 Eurostopodus papuensis
Side-by-Side Comparison
| 属性 | Silky-tailed Nightjar | Papuan Nightjar |
|---|---|---|
| 学名 | Antrostomus sericocaudatus | Eurostopodus papuensis |
| 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) | 37.9 cm (14.9 in) |
| 体重 | 77.5 g (2.73 oz) | 80.5 g (2.84 oz) |
| 食性 | Hawks moths and beetles in nocturnal aerial sallies over South American lowland and foothill forest. | Hawks large flying insects, especially moths, at night over Papuan forest and savanna. |
| 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
Papuan Nightjar
Churring, repetitive nocturnal call; soft bubbling trill; melodic series of hollow notes; calls from low perch or ground in New Guinea lowland forest
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.
Papuan Nightjar
Resident of savanna woodland, grass, and scrub in lowland New Guinea (Papua, Indonesia and Papua New Guinea).
保全状況
Silky-tailed Nightjar
Papuan 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 …
Papuan Nightjar
Dark grey-brown finely vermiculated with buff and black; pale buff and rufous throat patch; pale supercilium; no white wing patches; tail barred brown and buff; cryptically patterned bark-mimicking plumage.
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.
Papuan Nightjar
ニューギニア南部の低地に生息するヨタカで、体重81g。