Atlantic White Tern vs River Tern
Gygis alba 比較対象 Sterna aurantia
Side-by-Side Comparison
| 属性 | Atlantic White Tern | River Tern |
|---|---|---|
| 学名 | Gygis alba | Sterna aurantia |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保全状況 | Least Concern | Vulnerable |
| 体長 | — | — |
| 翼開長 | 50.4 cm (19.8 in) | 52.4 cm (20.6 in) |
| 体重 | 138.0 g (4.87 oz) | 187.5 g (6.61 oz) |
| 食性 | -- | -- |
| 一腹卵数 | 1 | 3-4 |
| Population Trend | — | — |
Habitat Comparison
保全状況
Least Concern
Atlantic White Tern
Vulnerable
River Tern
About These Birds
Atlantic White Tern
シロアジサシは体長28〜33 cm、翼幅76〜87 cm、霊妙な白色の海鳥で青灰色のくちばし・青みがかった眼輪・大きな暗色の瞳を持つ。大西洋の熱帯の島（アセンション島・セントヘレナ島など）に繁殖し、近縁種はインド・太平洋に広く分布。巣材なしで裸の枝に産卵。水面近くで小魚を捕食。
River Tern
River Tern, 38–43 cm, is a large freshwater tern of South and Southeast Asia, found along major rivers from Pakistan to Thailand. Yellow-orange bill, grey back, black cap in breeding plumage. Piscivore; plunge-dives into clear river water. Near Threatened due to river sand-mining and disturbance.