Heinrich's Nightjar vs Rufous-bellied Nighthawk
Eurostopodus diabolicus مقارنةً بـ Lurocalis rufiventris
Side-by-Side Comparison
| السمة | Heinrich's Nightjar | Rufous-bellied Nighthawk |
|---|---|---|
| الاسم العلمي | Eurostopodus diabolicus | Lurocalis rufiventris |
| الرتبة | Caprimulgiformes | Caprimulgiformes |
| الفصيلة | Caprimulgidae | Caprimulgidae |
| حالة الحفاظ | Least Concern | Least Concern |
| الطول | — | — |
| طول الجناح | 39,9 cm (15.7 in) | 40,6 cm (16.0 in) |
| الوزن | 104,0 g (3.67 oz) | 104,5 g (3.69 oz) |
| النظام الغذائي | 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. |
| عدد البيض في الوضع | 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.
حالة الحفاظ
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.