Aleutian Tern vs Greater Crested Tern
Onychoprion aleuticus 对比 Thalasseus bergii
Side-by-Side Comparison
| 属性 | Aleutian Tern | Greater Crested Tern |
|---|---|---|
| 学名 | Onychoprion aleuticus | Thalasseus bergii |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保护状况 | Vulnerable | Least Concern |
| 体长 | — | — |
| 翼展 | 52.4 cm (20.6 in) | 71.6 cm (28.2 in) |
| 体重 | 104.88 g (3.70 oz) | 367.75 g (12.97 oz) |
| 食性 | -- | -- |
| 产卵数 | 1-4 | 1-3 |
| Population Trend | — | — |
Habitat Comparison
保护状况
Vulnerable
Aleutian Tern
Least Concern
Greater Crested 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.
Greater Crested Tern
Greater Crested Tern, 43–48 cm, is the largest crested tern of the Indo-Pacific, breeding from South Africa to Japan and Australia. Yellow-green bill, prominent black crest, grey back. Colonial breeder on sand islands; plunge-dives for fish. Partially migratory; disperses across Indian and Pacific Oceans.