Heinrich's Nightjar vs Spot-tailed Nightjar
Eurostopodus diabolicus so với Hydropsalis maculicaudus
Side-by-Side Comparison
| Thuộc Tính | Heinrich's Nightjar | Spot-tailed Nightjar |
|---|---|---|
| Tên Khoa Học | Eurostopodus diabolicus | Hydropsalis maculicaudus |
| 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) | 25,8 cm (10.2 in) |
| Khối Lượng | 104,0 g (3.67 oz) | 32,125 g (1.13 oz) |
| Chế Độ Ăn | Nocturnal aerial insectivore; catches moths and beetles in flight over Sulawesi forest; poorly known. | Catches flying insects in nocturnal aerial pursuit over Central and South American grassland. |
| Số Trứng | 1 | 1-2 |
| 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
Spot-tailed Nightjar
Soft, rhythmic churring; gentle 'trrr-trrr' from humid grassland; calls low from ground; quieter than most nightjars; alarm a subtle 'chek'; small and inconspicuous
Geographic Range & Migration
Heinrich's Nightjar
Endemic to Sulawesi, Indonesia; resident of montane forest; extremely rare and poorly known, with very few records.
Spot-tailed Nightjar
Resident of open cerrado, scrub, and forest edge in interior South America from Venezuela and the Guianas south to Bolivia, Brazil, and Paraguay.
Tình Trạng Bảo Tồn
Heinrich's Nightjar
Spot-tailed Nightjar
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.
Spot-tailed Nightjar
Small; brown and buff mottled above; pale buff below with dark barring; white throat in male; distinctive white spots on rounded tail distinguishing it from similar Hydropsalis; buff throat in …
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.
Spot-tailed Nightjar
A very small Caprimulgidae nightjar (~32 g) of open cerrado, llanos, and grass savanna in Central America and tropical South America. Named for white spots on the outer tail. Extremely secretive; roosts on the ground. Feeds on tiny insects at dusk and dawn. Less vocal than related species; Least Concern.