Swallow-tailed Gull vs Aleutian Tern
Creagrus furcatus verglichen mit Onychoprion aleuticus
Side-by-Side Comparison
| Merkmal | Swallow-tailed Gull | Aleutian Tern |
|---|---|---|
| Wissenschaftlicher Name | Creagrus furcatus | Onychoprion aleuticus |
| Ordnung | Charadriiformes | Charadriiformes |
| Familie | Laridae | Laridae |
| Erhaltungsstatus | Least Concern | Vulnerable |
| Länge | — | — |
| Flügelspannweite | 81,8 cm (32.2 in) | 52,4 cm (20.6 in) |
| Gewicht | 695,0 g (24.52 oz) | 104,88 g (3.70 oz) |
| Ernährung | -- | -- |
| Gelegegröße | 1 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Gemeinsame Lebensräume
Swallow-tailed Gull only
-
Aleutian Tern only
Erhaltungsstatus
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.