Aleutian Tern vs South American Tern
Onychoprion aleuticus compared with Sterna hirundinacea
Side-by-Side Comparison
| Attribute | Aleutian Tern | South American Tern |
|---|---|---|
| Scientific Name | Onychoprion aleuticus | Sterna hirundinacea |
| Order | Charadriiformes | Charadriiformes |
| Family | Laridae | Laridae |
| Conservation Status | Vulnerable | Least Concern |
| Length | — | — |
| Wingspan | 52.4 cm (20.6 in) | 59.3 cm (23.3 in) |
| Weight | 104.88 g (3.70 oz) | 190.25 g (6.71 oz) |
| Diet | -- | -- |
| Clutch Size | 1-4 | 1-3 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Vulnerable
Aleutian Tern
Least Concern
South American 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.
South American Tern
South American Tern, 40–44 cm, is the largest South American tern, breeding from Peru around Cape Horn to southeastern Brazil. Red bill, grey mantle, black cap. Pelagic and coastal piscivore; strong plunge-diver. Movements poorly known; some populations may migrate north along both coasts.