Aleutian Tern vs Kerguelen Tern
Onychoprion aleuticus 对比 Sterna virgata
Side-by-Side Comparison
| 属性 | Aleutian Tern | Kerguelen Tern |
|---|---|---|
| 学名 | Onychoprion aleuticus | Sterna virgata |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保护状况 | Vulnerable | Near Threatened |
| 体长 | — | — |
| 翼展 | 52.4 cm (20.6 in) | 50.0 cm (19.7 in) |
| 体重 | 104.88 g (3.70 oz) | 127.5 g (4.50 oz) |
| 食性 | -- | -- |
| 产卵数 | 1-4 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
保护状况
Vulnerable
Aleutian Tern
Near Threatened
Kerguelen 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.
Kerguelen Tern
Kerguelen Tern, 31–33 cm, is restricted to a handful of sub-Antarctic islands including Kerguelen and Crozet. Darker grey than Antarctic Tern, with reddish bill. Piscivore and invertivore; forages in kelp beds and coastal waters. Near Threatened; small, isolated population vulnerable to introduced predators.