Heinrich's Nightjar vs Ladder-tailed Nightjar
Eurostopodus diabolicus so với Hydropsalis climacocerca
Side-by-Side Comparison
| Thuộc Tính | Heinrich's Nightjar | Ladder-tailed Nightjar |
|---|---|---|
| Tên Khoa Học | Eurostopodus diabolicus | Hydropsalis climacocerca |
| 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) | 29,9 cm (11.8 in) |
| Khối Lượng | 104,0 g (3.67 oz) | 48,0 g (1.69 oz) |
| Chế Độ Ăn | Nocturnal aerial insectivore; catches moths and beetles in flight over Sulawesi forest; poorly known. | Nocturnal aerial insectivore; hawks insects over Amazonian river margins and forest clearings. |
| Số Trứng | 1 | 2 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Không
Heinrich's Nightjar only
Ladder-tailed Nightjar only
Song & Call Comparison
Heinrich's Nightjar
Haunting, hollow 'ku-WOO' repeated rhythmically; deep resonant quality; distinctive mournful whistle carrying through Sulawesi forest at night
Ladder-tailed Nightjar
Resonant churring trill over Amazonian rivers; 'churr-churr' with hollow quality; calls from riverside sandbars and beaches at dusk; distinctive riverside habitat singer
Geographic Range & Migration
Heinrich's Nightjar
Endemic to Sulawesi, Indonesia; resident of montane forest; extremely rare and poorly known, with very few records.
Ladder-tailed Nightjar
Resident of sandy riverbanks, open woodland, and savanna in the Amazon basin from Colombia and Peru south to Bolivia and central Brazil.
Tình Trạng Bảo Tồn
Heinrich's Nightjar
Ladder-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.
Ladder-tailed Nightjar
Male brown and buff mottled above; white throat; graduated tail with white ladder pattern on inner webs of outer rectrices diagnostic; white wing patches. Female has buff throat; tail barred …
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.
Ladder-tailed Nightjar
A small Caprimulgidae nightjar (~48 g) of rivers, oxbow lakes, and riverine forest edges throughout the Amazon Basin. Males possess white-banded, step-like outer tail feathers giving a ladder appearance. Roosts on branches and sandy banks near water. Feeds on insects at night. Least Concern.