Sickle-winged Nightjar vs Archbold's Nightjar
Eleothreptus anomalus dibandingkan dengan Eurostopodus archboldi
Side-by-Side Comparison
| Atribut | Sickle-winged Nightjar | Archbold's Nightjar |
|---|---|---|
| Nama Ilmiah | Eleothreptus anomalus | Eurostopodus archboldi |
| Ordo | Caprimulgiformes | Caprimulgiformes |
| Famili | Caprimulgidae | Caprimulgidae |
| Status Konservasi | Vulnerable | Least Concern |
| Panjang | — | — |
| Rentang Sayap | 25,8 cm (10.2 in) | 41,0 cm (16.1 in) |
| Berat | 43,7 g (1.54 oz) | 77,0 g (2.72 oz) |
| Diet | Aerial insectivore; hawks moths and beetles at night over South American wet grassland and marshes. | Aerial insectivore; catches moths and beetles in nocturnal flight over New Guinea montane forest. |
| Ukuran Sarang | 2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Habitat Bersama
None
Sickle-winged Nightjar only
Archbold's Nightjar only
Song & Call Comparison
Sickle-winged Nightjar
Soft churring call; low-pitched, repetitive trill from grassland; males produce distinctive wing noise in display flight; vocalizations quiet compared to wing sounds
Archbold's Nightjar
Rarely recorded; presumed churring nocturnal song; low, resonant trilling typical of genus; vocalizations scarcely documented from highland New Guinea
Geographic Range & Migration
Sickle-winged Nightjar
Resident of open marshland, wet grassland, and savanna from Paraguay and adjacent Bolivia south to Uruguay and northeastern Argentina.
Archbold's Nightjar
Resident of montane forest in central New Guinea (Snow Mountains and Star Mountains) above 1,500 m; very poorly known.
Status Konservasi
Sickle-winged Nightjar
Archbold's Nightjar
How to Tell Them Apart
Sickle-winged Nightjar
Male with extraordinarily elongated sickle-shaped outer primaries; dark brown with buff mottling; white throat and wing spots. Female brown with buff spots; normal wing shape; male wing shape unique among …
Archbold's Nightjar
Brown and dark grey with rufous-buff vermiculations; whitish throat patch; pale buff supercilium contrasts with darker crown; no white wing or tail patches; tail barred; New Guinea highlands; few records.
About These Birds
Sickle-winged Nightjar
A small Caprimulgidae nightjar (~44 g) of wet pampa grassland and marshes in southeastern South America. Males possess uniquely curved primary feathers creating a sickle-wing silhouette in flight. Inhabits dense grass over moist soils. Feeds on insects at dusk. Vulnerable from grassland drainage and conversion to cropland.
Archbold's Nightjar
A small Caprimulgidae nightjar (~77 g) known from subalpine grasslands and forest margins in the interior mountains of New Guinea. Named after naturalist Richard Archbold. Cryptic brown-patterned plumage. Nocturnal insectivore. Infrequently observed; biology largely undescribed. Least Concern in its montane range.