Black-tailed Gull vs Aleutian Tern
Larus crassirostris compared with Onychoprion aleuticus
Side-by-Side Comparison
| Attribute | Black-tailed Gull | Aleutian Tern |
|---|---|---|
| Scientific Name | Larus crassirostris | Onychoprion aleuticus |
| 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) | 104.88 g (3.70 oz) |
| Diet | -- | -- |
| Clutch Size | 2-3 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Black-tailed Gull
Vulnerable
Aleutian 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.
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.