Black-tailed Gull vs South American Tern
Larus crassirostris compared with Sterna hirundinacea
Side-by-Side Comparison
| Attribute | Black-tailed Gull | South American Tern |
|---|---|---|
| Scientific Name | Larus crassirostris | Sterna hirundinacea |
| Order | Charadriiformes | Charadriiformes |
| Family | Laridae | Laridae |
| Conservation Status | Least Concern | Least Concern |
| Length | — | — |
| Wingspan | 72.8 cm (28.7 in) | 59.3 cm (23.3 in) |
| Weight | 675.0 g (23.81 oz) | 190.25 g (6.71 oz) |
| Diet | -- | -- |
| Clutch Size | 2-3 | 1-3 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Black-tailed Gull
Least Concern
South American Tern
About These Birds
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.
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.