Swallow-tailed Gull vs Aleutian Tern
Creagrus furcatus 对比 Onychoprion aleuticus
Side-by-Side Comparison
| 属性 | Swallow-tailed Gull | Aleutian Tern |
|---|---|---|
| 学名 | Creagrus furcatus | Onychoprion aleuticus |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保护状况 | Least Concern | Vulnerable |
| 体长 | — | — |
| 翼展 | 81.8 cm (32.2 in) | 52.4 cm (20.6 in) |
| 体重 | 695.0 g (24.52 oz) | 104.88 g (3.70 oz) |
| 食性 | -- | -- |
| 产卵数 | 1 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
保护状况
Least Concern
Swallow-tailed Gull
Vulnerable
Aleutian Tern
About These Birds
Swallow-tailed Gull
燕尾鸥（Creagrus furcatus）— 在加拉帕戈斯群岛繁殖的世界上唯一完全夜行性的鸥。燕尾状尾羽和红色眼圈为特征。在海上取食。
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.