Grey Nightjar vs Spotted Nightjar
Caprimulgus jotaka 比較対象 Eurostopodus argus
Side-by-Side Comparison
| 属性 | Grey Nightjar | Spotted Nightjar |
|---|---|---|
| 学名 | Caprimulgus jotaka | Eurostopodus argus |
| 目 | Caprimulgiformes | Caprimulgiformes |
| 科 | Caprimulgidae | Caprimulgidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 40.7 cm (16.0 in) | 42.7 cm (16.8 in) |
| 体重 | 84.4 g (2.98 oz) | 102.5 g (3.62 oz) |
| 食性 | Hawks moths and large insects at dusk and night over East and SE Asian forest … | Aerial insectivore; hawks large moths, beetles, and flying insects at dusk and dawn over Australian … |
| 一腹卵数 | 1-2 | 1 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
Grey Nightjar
Persistent 'cawk-cawk-cawk'; hollow, frog-like notes repeated rapidly; calls from East Asian forests at night; higher-pitched variant churr also given; very persistent caller
Spotted Nightjar
Loud churring 'good-lord-deliver-us' repeated at dusk; melodic bubbling quality; also emits hollow 'cow-cow-cow' series and soft frog-like croaking
Geographic Range & Migration
Grey Nightjar
Breeds in deciduous and mixed forest from far eastern Russia and northern China south to Korea and Japan; winters in southern and Southeast Asia.
Spotted Nightjar
Resident and partial migrant of open woodland, grassland, and scrub across mainland Australia and migrating to New Guinea and Indonesia in winter.
保全状況
Grey Nightjar
Spotted Nightjar
How to Tell Them Apart
Grey Nightjar
Grey-brown above with pale buff vermiculations; grey tones stronger than Jungle Nightjar; white throat patch; white outer wing spots; white outer tail in male; buff throat and tail spots in …
Spotted Nightjar
Cryptically mottled grey-brown, rufous, and black with intricate vermiculations; distinctive large white spots on wing coverts; white throat patch; no white in wings or tail. Sexes similar with slight pattern …
About These Birds
Grey Nightjar
体重約84gの日本・朝鮮・中国東北部の山地林で繁殖し、東南アジアで越冬するヨタカ。鼻音のピョーピョーという鳴き声が特徴。
Spotted Nightjar
オーストラリア本土のスピニフェックス草原に生息するヨタカで、体重103g。