Sickle-winged Nightjar vs Heinrich's Nightjar
Eleothreptus anomalus comparé à Eurostopodus diabolicus
Side-by-Side Comparison
| Attribut | Sickle-winged Nightjar | Heinrich's Nightjar |
|---|---|---|
| Nom scientifique | Eleothreptus anomalus | Eurostopodus diabolicus |
| Ordre | Caprimulgiformes | Caprimulgiformes |
| Famille | Caprimulgidae | Caprimulgidae |
| Statut de conservation | Vulnerable | Least Concern |
| Longueur | — | — |
| Envergure | 25,8 cm (10.2 in) | 39,9 cm (15.7 in) |
| Poids | 43,7 g (1.54 oz) | 104,0 g (3.67 oz) |
| Régime alimentaire | 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. |
| Taille de la couvée | 2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Habitats partagés
Aucun(e)
Sickle-winged Nightjar only
Heinrich's Nightjar only
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.
Statut de conservation
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
A small Caprimulgidae nightjar (~44 g) of wet pampa grassland and marshes in southeastern South America. Males possess uniquely curved primary feathers creating a sickle-wing silhouette in flight. Inhabits dense grass over moist soils. Feeds on insects at dusk. Vulnerable from grassland drainage and conversion to cropland.
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.