Aleutian Tern vs Black-bellied Tern
Onychoprion aleuticus в сравнении с Sterna acuticauda
Side-by-Side Comparison
| Характеристика | Aleutian Tern | Black-bellied Tern |
|---|---|---|
| Научное название | Onychoprion aleuticus | Sterna acuticauda |
| Отряд | Charadriiformes | Charadriiformes |
| Семейство | Laridae | Laridae |
| Охранный статус | Vulnerable | Endangered |
| Длина | — | — |
| Размах крыльев | 52,4 cm (20.6 in) | 44,8 cm (17.6 in) |
| Масса | 104,88 g (3.70 oz) | 159,5 g (5.63 oz) |
| Питание | -- | -- |
| Размер кладки | 1-4 | 2-3 |
| Population Trend | — | — |
Habitat Comparison
Общие среды обитания
Aleutian Tern only
Black-bellied Tern only
Нет
Охранный статус
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.