Black-headed Duck vs White-backed Duck
Heteronetta atricapilla 比較対象 Thalassornis leuconotus
Side-by-Side Comparison
| 属性 | Black-headed Duck | White-backed Duck |
|---|---|---|
| 学名 | Heteronetta atricapilla | Thalassornis leuconotus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 34.7 cm (13.7 in) | 33.3 cm (13.1 in) |
| 体重 | 528.5 g (18.64 oz) | 704.6666666666666 g (24.86 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Eats aquatic plants, grasses, and seeds; large tropical swan grazing on lake margins and floating … |
| 一腹卵数 | 2 | 4-10 |
| Population Trend | — | — |
Habitat Comparison
White-backed Duck
Freshwater lakes, ponds, and swamps with abundant floating aquatic vegetation, especially water lilies, in sub-Saharan Africa and Madagascar. Prefers shallow sheltered water with emergent vegetation for cover.
Song & Call Comparison
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.
White-backed Duck
Soft, low whistles and hissing sounds. The White-backed Duck is relatively quiet compared to whistling-ducks. Alarm call is a low 'peep'. Mostly heard at night.
Geographic Range & Migration
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.
White-backed Duck
Breeds in subarctic Canada; winters along the Atlantic coast from New England to Florida and on the Gulf Coast.
保全状況
Black-headed Duck
White-backed Duck
How to Tell Them Apart
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.
White-backed Duck
Heavily mottled and barred brown and buff overall. Diagnostic white back patch visible in flight. Head brown with whitish face and chin. Stiff tail held erect. Sexes similar; stiff-tail diving …
About These Birds
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。
White-backed Duck
ホワイトバックドダックはアフリカ南部と東部に分布する潜水性カモです。背中の白い斑と斑模様の羽毛が特徴です。水草が豊富な湖や湿地に生息し、主にキイトモ（Potamogeton）の塊茎を潜って採食します。繁殖期には水面に浮かぶ巣を作ります。