Arctic Tern vs Common Gull-billed Tern
Sterna paradisaea 比較対象 Gelochelidon nilotica
Side-by-Side Comparison
| 属性 | Arctic Tern | Common Gull-billed Tern |
|---|---|---|
| 学名 | Sterna paradisaea | Gelochelidon nilotica |
| 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) | 61.6 cm (24.3 in) |
| 体重 | 110.0 g (3.88 oz) | 214.075 g (7.55 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| 一腹卵数 | 2-3 | 1-3 |
| 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 Gull-billed 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 Gull-billed Tern
保全状況
Arctic Tern
Common Gull-billed 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 Gull-billed 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 Gull-billed Tern
世界中の温帯から熱帯の海岸・塩性湿地・内陸湿地で繁殖するアジサシ（体長35〜43cm）。白い体と黒い帽子が特徴で、他のアジサシとは異なり魚より昆虫を多く食べる。Gelochelidon nilotica（ハシブトアジサシ）は水に潜らず地面で採食し、カエルや大型昆虫も好む。Laridae科。