Arctic Tern vs Western Gull
Sterna paradisaea 比較対象 Larus occidentalis
Side-by-Side Comparison
| 属性 | Arctic Tern | Western Gull |
|---|---|---|
| 学名 | Sterna paradisaea | Larus occidentalis |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 34.0 cm (13.4 in) | — |
| 翼開長 | 80.0 cm (31.5 in) | 79.5 cm (31.3 in) |
| 体重 | 110.0 g (3.88 oz) | 957.5 g (33.77 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| 一腹卵数 | 2-3 | 1-5 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Arctic Tern
Breeds on coastal and tundra habitats. Spends most of its life at sea over the open ocean. Nests in colonies on beaches and rocky shores.
Song & Call Comparison
Arctic Tern
A sharp, grating 'kree-yah' alarm call. Also gives 'kik-kik-kik' near the nest. Highly aggressive vocally during the Arctic breeding season. Calls are harsh and insistent.
Western Gull
Geographic Range & Migration
Arctic Tern
Breeds in the Arctic and sub-Arctic. Migrates to the Antarctic, experiencing two summers per year. Found on every ocean.
Western Gull
保全状況
Arctic Tern
Western Gull
How to Tell Them Apart
Arctic Tern
Pale grey upperparts, white underparts with a black cap. Blood-red bill and short red legs. Deeply forked tail streamers. Winter adults lose the full black cap.
Slender, pointed, bright red bill
Western Gull
About These Birds
Arctic Tern
キョクアジサシはあらゆる動物の中で最長の渡りを行い、毎年北極と南極を往復する約7万kmの旅をする。30年の寿命の中に、月への往復3回分に相当する飛翔距離を積み重ねる可能性がある。地球上でどの生物よりも多くの昼光を経験するこの驚異的な鳥は、太陽を追い続ける。
Western Gull
Western Gull, 55–68 cm, is the dominant large gull on the US Pacific coast from Washington to Baja California. Dark-mantled with pink legs, yellow bill with red spot. Omnivore; breeds on offshore islands, scavenges at harbours and landfills. Non-migratory; resident along its breeding coast.