Arctic Tern vs Emu
Sterna paradisaea 比較対象 Dromaius novaehollandiae
Side-by-Side Comparison
| 属性 | Arctic Tern | Emu |
|---|---|---|
| 学名 | Sterna paradisaea | Dromaius novaehollandiae |
| 目 | Charadriiformes | Casuariiformes |
| 科 | Laridae | Dromaiidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 34.0 cm (13.4 in) | 175.0 cm (68.9 in) |
| 翼開長 | 80.0 cm (31.5 in) | 20.0 cm (7.9 in) |
| 体重 | 110.0 g (3.88 oz) | 45000.0 g (1587.33 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | Plants, seeds, fruits, flowers, and insects. Swallows large stones and charcoal to grind food in … |
| 一腹卵数 | 2-3 | 5-24 |
| 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.
Emu
Open grasslands, savanna woodlands, scrublands, and semi-arid plains across Australia. Avoids dense forest and true desert.
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.
Emu
Deep, resonant booming grunt 'e-moo', often repeated 3 times. Females give a deep drumming call produced by an inflatable throat pouch. Generally low-pitched and far-carrying.
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.
Emu
Throughout mainland Australia. Absent from Tasmania, where the Tasmanian emu was driven to extinction by 1850.
保全状況
Arctic Tern
Emu
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
Emu
Shaggy grey-brown plumage with double-shafted feathers giving a loose, hair-like appearance. Bare blue skin on the face and neck.
Broad, flat, dark grey bill
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。
Emu
オーストラリア固有の世界第二位の大型鳥類。1932年の「エミュー戦争」で知られる。飛べないが速く走れる。