Bonaparte's Nightjar vs Heinrich's Nightjar
Caprimulgus concretus compared with Eurostopodus diabolicus
Side-by-Side Comparison
| Attribute | Bonaparte's Nightjar | Heinrich's Nightjar |
|---|---|---|
| Scientific Name | Caprimulgus concretus | Eurostopodus diabolicus |
| Order | Caprimulgiformes | Caprimulgiformes |
| Family | Caprimulgidae | Caprimulgidae |
| Conservation Status | Vulnerable | Least Concern |
| Length | — | — |
| Wingspan | 32.8 cm (12.9 in) | 39.9 cm (15.7 in) |
| Weight | 57.5 g (2.03 oz) | 104.0 g (3.67 oz) |
| Diet | Crepuscular and nocturnal insectivore; catches moths, beetles, and large flying insects on the wing in … | Nocturnal aerial insectivore; catches moths and beetles in flight over Sulawesi forest; poorly known. |
| Clutch Size | 1 | 1 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Bonaparte's Nightjar
Churring call from Borneo lowland forest; repetitive hollow trill; rarely recorded; calls at night from dense humid forest; alarm a sharp bark note
Heinrich's Nightjar
Haunting, hollow 'ku-WOO' repeated rhythmically; deep resonant quality; distinctive mournful whistle carrying through Sulawesi forest at night
Geographic Range & Migration
Bonaparte's Nightjar
Found in highland Borneo and Sumatra in montane forest at 1,000–2,500 m. Endemic to the Sundaic region; infrequently recorded.
Heinrich's Nightjar
Endemic to Sulawesi, Indonesia; resident of montane forest; extremely rare and poorly known, with very few records.
Conservation Status
Bonaparte's Nightjar
Heinrich's Nightjar
How to Tell Them Apart
Bonaparte's Nightjar
Rich dark brown upperparts with black-centred feathers and buff-chestnut edging; white throat patch; densely barred underparts; males have white outer tail feathers; Bornean endemic with notably deep brown tones.
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.
About These Birds
Bonaparte's Nightjar
A small, secretive nightjar (20-22 cm) of lowland and peat-swamp forests in Borneo and Sumatra. Dark brown plumage with fine barring. Nocturnal insectivore, poorly known due to dense forest habitat. Classified as Near Threatened due to ongoing deforestation.
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.