Silky-tailed Nightjar vs Papuan Nightjar
Antrostomus sericocaudatus comparado com Eurostopodus papuensis
Side-by-Side Comparison
| Atributo | Silky-tailed Nightjar | Papuan Nightjar |
|---|---|---|
| Nome científico | Antrostomus sericocaudatus | Eurostopodus papuensis |
| Ordem | Caprimulgiformes | Caprimulgiformes |
| Família | Caprimulgidae | Caprimulgidae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | — | — |
| Envergadura | 32,1 cm (12.6 in) | 37,9 cm (14.9 in) |
| Peso | 77,5 g (2.73 oz) | 80,5 g (2.84 oz) |
| Dieta | 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. |
| Tamanho da postura | 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).
Estado de conservação
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
A small Caprimulgidae nightjar (~81 g) of lowland savanna, grassland, and forest edges across the southern lowlands of New Guinea. Cryptic buff-and-brown plumage; white-spotted wings visible in flight. Nocturnal aerial insectivore. Commonly heard at night but rarely seen by day. Least Concern.