Aleutian Tern vs River Tern
Onychoprion aleuticus 对比 Sterna aurantia
Side-by-Side Comparison
| 属性 | Aleutian Tern | River Tern |
|---|---|---|
| 学名 | Onychoprion aleuticus | Sterna aurantia |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保护状况 | Vulnerable | Vulnerable |
| 体长 | — | — |
| 翼展 | 52.4 cm (20.6 in) | 52.4 cm (20.6 in) |
| 体重 | 104.88 g (3.70 oz) | 187.5 g (6.61 oz) |
| 食性 | -- | -- |
| 产卵数 | 1-4 | 3-4 |
| Population Trend | — | — |
Habitat Comparison
保护状况
Vulnerable
Aleutian Tern
Vulnerable
River Tern
About These Birds
Aleutian Tern
Aleutian Tern, 32–34 cm, breeds colonially in Alaska and Russian Far East, wintering in Southeast Asian waters — one of the most poorly tracked migrations among seabirds. Dark grey above, white below, black cap with white forehead. Piscivore; dives for small fish. Near Threatened.
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.