Arctic Tern vs Common Tern
Sterna paradisaea 比較対象 Sterna hirundo
Side-by-Side Comparison
| 属性 | Arctic Tern | Common Tern |
|---|---|---|
| 学名 | Sterna paradisaea | Sterna hirundo |
| 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) | 50.7 cm (20.0 in) |
| 体重 | 110.0 g (3.88 oz) | 125.75 g (4.44 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| 一腹卵数 | 2-3 | 2-3 |
| 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.
Common Tern
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.
Common Tern
保全状況
Arctic Tern
Common Tern
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
Common Tern
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。
Common Tern
北半球全域で繁殖し、南半球で越冬するアジサシ（体長31〜35cm）。白い体に灰色の翼、赤いオレンジ嘴、黒い頭頂部が特徴。Sterna hirundo（アジサシ）は海面に垂直に急降下して小魚を捕食し、キツツキのように鋭い声で鳴く。「シャーン、シャーン」という声とエレガントな飛翔姿で人気。Laridae科。