Black Swan vs Hawaiian Goose
Cygnus atratus 比較対象 Branta sandvicensis
Side-by-Side Comparison
| 属性 | Black Swan | Hawaiian Goose |
|---|---|---|
| 学名 | Cygnus atratus | Branta sandvicensis |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Near Threatened |
| 体長 | 130.0 cm (51.2 in) | — |
| 翼開長 | 190.0 cm (74.8 in) | 72.8 cm (28.7 in) |
| 体重 | 6200.0 g (218.70 oz) | 2150.0 g (75.84 oz) |
| 食性 | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … | Eats aquatic plants, algae, and grasses; upends in shallow water to graze submerged vegetation; diet … |
| 一腹卵数 | 4-6 | 1-6 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Hawaiian Goose
Volcanic slopes, lava flows, coastal grasslands, and shrublands on Maui, Hawai'i, and Kauai. Adapted to rocky terrain with reduced toe webbing. Introduced to other Hawaiian islands. Avoids dense forest.
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.
Hawaiian Goose
A soft, low 'moo-moo' — the murmuring call gives the Nene its Hawaiian name. Also gives honking calls in flight. Less vocal than Canada Goose; distinctive murmuring quality.
Geographic Range & Migration
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Hawaiian Goose
Breeds in sub-Arctic Canada; winters on large lakes and rivers from the Gulf of Mexico north to where water remains open.
保全状況
Black Swan
Hawaiian Goose
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
Hawaiian Goose
Buff-tan neck with black and white channeled furrows. Crown and face black; hindneck black. Body gray-brown above; underparts pale with buff breast. Reduced webbing on feet. Sexes similar. State bird …
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。
Hawaiian Goose
ネーネーはハワイ固有のガン科鳥類で、ハワイ州の州鳥です。カナダガンから進化したと考えられており、足指の水かきが退化しています。溶岩台地や高地の草原に生息し、草や植物を採食します。20世紀に絶滅寸前まで個体数が減少しましたが、保全活動で回復しています。