Slaty-backed Gull vs Aleutian Tern
Larus schistisagus compared with Onychoprion aleuticus
Side-by-Side Comparison
| Attribute | Slaty-backed Gull | Aleutian Tern |
|---|---|---|
| Scientific Name | Larus schistisagus | Onychoprion aleuticus |
| Order | Charadriiformes | Charadriiformes |
| Family | Laridae | Laridae |
| Conservation Status | Least Concern | Vulnerable |
| Length | — | — |
| Wingspan | 87.0 cm (34.3 in) | 52.4 cm (20.6 in) |
| Weight | 1280.5 g (45.17 oz) | 104.88 g (3.70 oz) |
| Diet | -- | -- |
| Clutch Size | 1-4 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Conservation Status
Least Concern
Slaty-backed Gull
Vulnerable
Aleutian Tern
About These Birds
Slaty-backed Gull
Slaty-backed Gull, 55–68 cm, breeds on coasts and cliffs of the Russian Far East, wintering south to Japan and occasionally the US Pacific coast. Dark slate-grey mantle, pink legs, 'string of pearls' white mirrors on outer wing. Omnivore; scavenges at fishing ports in East Asian harbours.
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.