Black-tailed Gull vs River Tern
Larus crassirostris compared with Sterna aurantia
Side-by-Side Comparison
| Attribute | Black-tailed Gull | River Tern |
|---|---|---|
| Scientific Name | Larus crassirostris | Sterna aurantia |
| Order | Charadriiformes | Charadriiformes |
| Family | Laridae | Laridae |
| Conservation Status | Least Concern | Vulnerable |
| Length | — | — |
| Wingspan | 72.8 cm (28.7 in) | 52.4 cm (20.6 in) |
| Weight | 675.0 g (23.81 oz) | 187.5 g (6.61 oz) |
| Diet | -- | -- |
| Clutch Size | 2-3 | 3-4 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Black-tailed Gull
Vulnerable
River 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.
River Tern
River Tern, 38–43 cm, is a large freshwater tern of South and Southeast Asia, found along major rivers from Pakistan to Thailand. Yellow-orange bill, grey back, black cap in breeding plumage. Piscivore; plunge-dives into clear river water. Near Threatened due to river sand-mining and disturbance.