Swallow-tailed Gull vs Aleutian Tern
Creagrus furcatus so với Onychoprion aleuticus
Side-by-Side Comparison
| Thuộc Tính | Swallow-tailed Gull | Aleutian Tern |
|---|---|---|
| Tên Khoa Học | Creagrus furcatus | Onychoprion aleuticus |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Least Concern | Vulnerable |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 81,8 cm (32.2 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 695,0 g (24.52 oz) | 104,88 g (3.70 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 1 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Swallow-tailed Gull only
Không
Aleutian Tern only
Tình Trạng Bảo Tồn
Least Concern
Swallow-tailed Gull
Vulnerable
Aleutian Tern
About These Birds
Swallow-tailed Gull
Swallow-tailed Gull, 55–60 cm, is the world's only fully nocturnal gull, breeding on the Galápagos Islands and roosting on the Humboldt Current. Distinctive red orbital ring, black-and-white head, deeply forked tail. Feeds at sea at night on squid and fish attracted to surface by bioluminescence.
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.