Heinrich's Nightjar vs Rufous-bellied Nighthawk
Eurostopodus diabolicus so với Lurocalis rufiventris
Side-by-Side Comparison
| Thuộc Tính | Heinrich's Nightjar | Rufous-bellied Nighthawk |
|---|---|---|
| Tên Khoa Học | Eurostopodus diabolicus | Lurocalis rufiventris |
| Bộ | Caprimulgiformes | Caprimulgiformes |
| Họ | Caprimulgidae | Caprimulgidae |
| Tình Trạng Bảo Tồn | Least Concern | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 39,9 cm (15.7 in) | 40,6 cm (16.0 in) |
| Khối Lượng | 104,0 g (3.67 oz) | 104,5 g (3.69 oz) |
| Chế Độ Ăn | Nocturnal aerial insectivore; catches moths and beetles in flight over Sulawesi forest; poorly known. | Catches large flying insects in nocturnal aerial pursuit over Andean forest and forest edge. |
| Số Trứng | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Heinrich's Nightjar
Haunting, hollow 'ku-WOO' repeated rhythmically; deep resonant quality; distinctive mournful whistle carrying through Sulawesi forest at night
Rufous-bellied Nighthawk
Deep, hollow 'wok-wok' series; resonant frog-like calls from Andean forest canopy; lower in pitch than Short-tailed Nighthawk; carries across mountain valleys
Geographic Range & Migration
Heinrich's Nightjar
Endemic to Sulawesi, Indonesia; resident of montane forest; extremely rare and poorly known, with very few records.
Rufous-bellied Nighthawk
Resident of Andean foothills and montane forest edge from Colombia and Venezuela south through Ecuador and Peru to Bolivia, at 500–2,000 m.
Tình Trạng Bảo Tồn
Heinrich's Nightjar
Rufous-bellied Nighthawk
How to Tell Them Apart
Heinrich's Nightjar
Rufous-brown and dark brown mottled with buff vermiculations; large pale buff throat patch; pale buff supercilium; no white wing markings; tail darkly barred brown and buff. Poorly known; Sulawesi endemic.
Rufous-bellied Nighthawk
Dark sooty-brown above with buff and chestnut spotting; distinctive rufous-orange belly contrasting with dark breast; no white wing bar; short rounded tail; rufous tone on underparts unique among nighthawks.
About These Birds
Heinrich's Nightjar
A medium Caprimulgidae nightjar (~104 g) endemic to the forest and forest-edge habitats of Sulawesi, Indonesia. Cryptically patterned brown-and-buff. Nocturnal insectivore; catches moths and beetles in aerial sallies. Little studied and rarely encountered in the field. Least Concern within its Sulawesi range.
Rufous-bellied Nighthawk
A medium Caprimulgidae nighthawk (~105 g) of montane forest edges and humid foothill zones from Colombia to Bolivia. Rufous underparts contrast with dark upperparts; a white throat patch is visible. Hawk-like flight above the forest at dusk and dawn. Seldom recorded; biology little known. Least Concern.