Swallow-tailed Gull vs Black-tailed Gull
Creagrus furcatus verglichen mit Larus crassirostris
Side-by-Side Comparison
| Merkmal | Swallow-tailed Gull | Black-tailed Gull |
|---|---|---|
| Wissenschaftlicher Name | Creagrus furcatus | Larus crassirostris |
| Ordnung | Charadriiformes | Charadriiformes |
| Familie | Laridae | Laridae |
| Erhaltungsstatus | Least Concern | Least Concern |
| Länge | — | — |
| Flügelspannweite | 81,8 cm (32.2 in) | 72,8 cm (28.7 in) |
| Gewicht | 695,0 g (24.52 oz) | 675,0 g (23.81 oz) |
| Ernährung | -- | -- |
| Gelegegröße | 1 | 2-3 |
| Population Trend | — | — |
Habitat Comparison
Erhaltungsstatus
Least Concern
Swallow-tailed Gull
Least Concern
Black-tailed Gull
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.
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.