Black-tailed Gull vs Aleutian Tern
Larus crassirostris so với Onychoprion aleuticus
Side-by-Side Comparison
| Thuộc Tính | Black-tailed Gull | Aleutian Tern |
|---|---|---|
| Tên Khoa Học | Larus crassirostris | Onychoprion aleuticus |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Least Concern | Vulnerable |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 72,8 cm (28.7 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 675,0 g (23.81 oz) | 104,88 g (3.70 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 2-3 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Black-tailed Gull only
Không
Aleutian Tern only
Tình Trạng Bảo Tồn
Least Concern
Black-tailed Gull
Vulnerable
Aleutian Tern
About These Birds
Black-tailed Gull
Black-tailed Gull, 44–48 cm, is common on East Asian coasts from Russia to China, Japan, and Korea. Grey mantle, white body, yellow bill with red spot and black subterminal band, yellow legs. Omnivore; very vocal, known as the 'cat gull' for its mewing calls. Migratory; winters south to Vietnam.
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.