Aleutian Tern vs Forster's Tern
Onychoprion aleuticus verglichen mit Sterna forsteri
Side-by-Side Comparison
| Merkmal | Aleutian Tern | Forster's Tern |
|---|---|---|
| Wissenschaftlicher Name | Onychoprion aleuticus | Sterna forsteri |
| Ordnung | Charadriiformes | Charadriiformes |
| Familie | Laridae | Laridae |
| Erhaltungsstatus | Vulnerable | Least Concern |
| Länge | — | — |
| Flügelspannweite | 52,4 cm (20.6 in) | 50,5 cm (19.9 in) |
| Gewicht | 104,88 g (3.70 oz) | 151,25 g (5.34 oz) |
| Ernährung | -- | -- |
| Gelegegröße | 1-4 | 2-3 |
| Population Trend | — | — |
Habitat Comparison
Erhaltungsstatus
Vulnerable
Aleutian Tern
Least Concern
Forster's Tern
About These Birds
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.
Forster's Tern
Forster's Tern, 33–36 cm, breeds in interior North American marshes and winters along both US coasts and into Mexico. Distinctive frosted silver upperparts and orange-based bill. In non-breeding plumage, shows a black eye-mask. Piscivore; hovers and plunge-dives in coastal bays and lagoons.