Ruddy-headed Goose vs Black-headed Duck
Chloephaga rubidiceps 比較対象 Heteronetta atricapilla
Side-by-Side Comparison
| 属性 | Ruddy-headed Goose | Black-headed Duck |
|---|---|---|
| 学名 | Chloephaga rubidiceps | Heteronetta atricapilla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 65.1 cm (25.6 in) | 34.7 cm (13.7 in) |
| 体重 | 1756.8333333333333 g (61.97 oz) | 528.5 g (18.64 oz) |
| 食性 | Feeds on grasses, grain, and aquatic invertebrates; grazes farmland and freshwater margins; diet heavier in … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| 一腹卵数 | 3-8 | 2 |
| Population Trend | — | — |
Habitat Comparison
Ruddy-headed Goose
Breeds on open tussock grasslands and moorland in Tierra del Fuego and the Falkland Islands. Mainland wintering population on Patagonian grasslands now critically small. Falkland Islands population relatively stable.
Song & Call Comparison
Ruddy-headed Goose
A high, whistled 'whee' from males and a cackling rattle from females. Calls similar to Ashy-headed Goose. Falkland Islands population; calls in open coastal grassland.
Black-headed Duck
Male gives a soft, raspy peeping note; female produces a muted quack. An obligate brood parasite with reduced vocalizations; subdued calls suit its secretive lifestyle among Argentine reeds.
Geographic Range & Migration
Ruddy-headed Goose
Breeds in the coastal tundra of Siberia; winters in Southeast Asia and Australia. Long-distance migrant along the East Asian flyway.
Black-headed Duck
Resident in southern South America from southern Brazil and Bolivia south to Argentina and Chile. Found on lakes and marshes in open lowlands.
保全状況
Ruddy-headed Goose
Black-headed Duck
How to Tell Them Apart
Ruddy-headed Goose
Distinctive rufous-brown head and neck; body barred rufous and black above; underparts buff-white finely barred. Orange-yellow legs. White wing patches in flight. Compact; sexes similar. Falklands and Patagonia.
Black-headed Duck
Male has distinctive jet-black head and neck, warm chestnut-brown back, and pale buff underparts; blue-grey bill with red base. Female is streaked brown above with pale supercilium and whitish underparts.
About These Birds
Ruddy-headed Goose
ルディーヘッドガンは南米南端のパタゴニアとフォークランド諸島に分布する小型のガン科鳥類です。雄は赤褐色の頭部と白い腹が特徴的です。草地に生息し、草を採食します。フォークランド諸島の繁殖個体群は激減しており、絶滅危惧種です。
Black-headed Duck
クロアタマカモはアルゼンチン・チリ・ウルグアイ・ブラジル南部の南アメリカ温帯湖沼・湿地に生息する托卵性のカモ（体長32〜35 cm）。雄は黒い頭と薄い茶色の体が特徴。他のカモ・コオット・ヒクイナの巣に托卵する。育雛しない数少ない水禽の一つ。