Aleutian Tern vs Black-bellied Tern
Onychoprion aleuticus 比較対象 Sterna acuticauda
Side-by-Side Comparison
| 属性 | Aleutian Tern | Black-bellied Tern |
|---|---|---|
| 学名 | Onychoprion aleuticus | Sterna acuticauda |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保全状況 | Vulnerable | Endangered |
| 体長 | — | — |
| 翼開長 | 52.4 cm (20.6 in) | 44.8 cm (17.6 in) |
| 体重 | 104.88 g (3.70 oz) | 159.5 g (5.63 oz) |
| 食性 | -- | -- |
| 一腹卵数 | 1-4 | 2-3 |
| Population Trend | — | — |
Habitat Comparison
保全状況
Vulnerable
Aleutian Tern
Endangered
Black-bellied 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.
Black-bellied Tern
Black-bellied Tern, 32–34 cm, is an Endangered freshwater tern of the Indian subcontinent, breeding on large river sandbars from Pakistan to Myanmar. Black belly contrasts with grey upperparts in breeding plumage; orange bill. Plunge-dives for small fish. Severely threatened by river modification.