Swallow-tailed Gull vs Aleutian Tern
Creagrus furcatus в сравнении с Onychoprion aleuticus
Side-by-Side Comparison
| Характеристика | Swallow-tailed Gull | Aleutian Tern |
|---|---|---|
| Научное название | Creagrus furcatus | Onychoprion aleuticus |
| Отряд | Charadriiformes | Charadriiformes |
| Семейство | Laridae | Laridae |
| Охранный статус | Least Concern | Vulnerable |
| Длина | — | — |
| Размах крыльев | 81,8 cm (32.2 in) | 52,4 cm (20.6 in) |
| Масса | 695,0 g (24.52 oz) | 104,88 g (3.70 oz) |
| Питание | -- | -- |
| Размер кладки | 1 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Общие среды обитания
Swallow-tailed Gull only
Нет
Aleutian Tern only
Охранный статус
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.