Sickle-winged Nightjar vs Heinrich's Nightjar
Eleothreptus anomalus 对比 Eurostopodus diabolicus
Side-by-Side Comparison
| 属性 | Sickle-winged Nightjar | Heinrich's Nightjar |
|---|---|---|
| 学名 | Eleothreptus anomalus | Eurostopodus diabolicus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Caprimulgidae | Caprimulgidae |
| 保护状况 | Vulnerable | Least Concern |
| 体长 | — | — |
| 翼展 | 25.8 cm (10.2 in) | 39.9 cm (15.7 in) |
| 体重 | 43.7 g (1.54 oz) | 104.0 g (3.67 oz) |
| 食性 | Aerial insectivore; hawks moths and beetles at night over South American wet grassland and marshes. | Nocturnal aerial insectivore; catches moths and beetles in flight over Sulawesi forest; poorly known. |
| 产卵数 | 2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Sickle-winged Nightjar
Soft churring call; low-pitched, repetitive trill from grassland; males produce distinctive wing noise in display flight; vocalizations quiet compared to wing sounds
Heinrich's Nightjar
Haunting, hollow 'ku-WOO' repeated rhythmically; deep resonant quality; distinctive mournful whistle carrying through Sulawesi forest at night
Geographic Range & Migration
Sickle-winged Nightjar
Resident of open marshland, wet grassland, and savanna from Paraguay and adjacent Bolivia south to Uruguay and northeastern Argentina.
Heinrich's Nightjar
Endemic to Sulawesi, Indonesia; resident of montane forest; extremely rare and poorly known, with very few records.
保护状况
Sickle-winged Nightjar
Heinrich's Nightjar
How to Tell Them Apart
Sickle-winged Nightjar
Male with extraordinarily elongated sickle-shaped outer primaries; dark brown with buff mottling; white throat and wing spots. Female brown with buff spots; normal wing shape; male wing shape unique among …
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
Sickle-winged Nightjar
体重约44克的小型夜鹰，栖息于南美洲东南部湿润潘帕斯草地。雄鸟具镰刀形翅膀轮廓。易危。
Heinrich's Nightjar
中型夜鹰（约104克），印度尼西亚苏拉威西特有种。夜行性食虫鸟。无危。