Black Swan vs Common Goldeneye
Cygnus atratus 比較対象 Bucephala clangula
Side-by-Side Comparison
| 属性 | Black Swan | Common Goldeneye |
|---|---|---|
| 学名 | Cygnus atratus | Bucephala clangula |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | 130.0 cm (51.2 in) | — |
| 翼開長 | 190.0 cm (74.8 in) | 41.7 cm (16.4 in) |
| 体重 | 6200.0 g (218.70 oz) | 921.0 g (32.49 oz) |
| 食性 | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … | Dives for aquatic invertebrates, crustaceans, molluscs, and small fish. Forages in lakes, rivers, and coastal … |
| 一腹卵数 | 4-6 | 1-28 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Song & Call Comparison
Black Swan
Gives a musical bugling 'boo-boo-boo' in flight and softer honking on water. Less vocal than Mute Swan; produces a baying call when alarmed. Wings whistle softly in flight.
Common Goldeneye
Male emits a buzzy, insect-like zeee-zeee-zeee wing whistle; female gives a grating quack. The mechanical wing-whistle produced by the male in display flight is the species' most distinctive sound.
Geographic Range & Migration
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Common Goldeneye
Breeds across boreal forests of North America, Europe, and Asia. Winters on coasts and large lakes south to the Mediterranean and the Gulf states.
保全状況
Black Swan
Common Goldeneye
How to Tell Them Apart
Black Swan
Almost entirely black with white flight feathers visible in flight. Red bill with a white band near the tip. Dark red to reddish-brown iris.
Bright red bill with a pale tip and prominent white band
Common Goldeneye
Male has glossy green-black head with round white spot at bill base; body white with black back and scapulars; yellow eye. Female has chocolate-brown head, white collar, and grey body.
About These Birds
Black Swan
コクチョウはかつてすべての白鳥は白いと信じていたヨーロッパ人に不可能と考えられており、帰納的推論の失敗の有名な哲学的な例となっている。西オーストラリア州の州の鳥。コクチョウは生涯続く番いの絆を形成し、両親が共同で抱卵と雛の世話を行う。
Common Goldeneye
ユーラシア大陸と北米の北方林で繁殖する潜水ガモ（体長40〜51cm）。雄は緑色光沢の頭部と白い眼下斑が特徴的。Bucephala clangula（ホオジロガモ）は木の洞に営巣し、飛翔時に翼から「スズ」のような音を出すことで知られる。日本の冬の海岸・湖沼でも観察できる。Anatidae科。