Aleutian Tern vs River Tern
Onychoprion aleuticus so với Sterna aurantia
Side-by-Side Comparison
| Thuộc Tính | Aleutian Tern | River Tern |
|---|---|---|
| Tên Khoa Học | Onychoprion aleuticus | Sterna aurantia |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Vulnerable | Vulnerable |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 52,4 cm (20.6 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 104,88 g (3.70 oz) | 187,5 g (6.61 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 1-4 | 3-4 |
| Population Trend | — | — |
Habitat Comparison
Tình Trạng Bảo Tồn
Vulnerable
Aleutian Tern
Vulnerable
River 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.
River Tern
River Tern, 38–43 cm, is a large freshwater tern of South and Southeast Asia, found along major rivers from Pakistan to Thailand. Yellow-orange bill, grey back, black cap in breeding plumage. Piscivore; plunge-dives into clear river water. Near Threatened due to river sand-mining and disturbance.