Black-headed Duck vs White-headed Steamerduck
Heteronetta atricapilla 比較対象 Tachyeres leucocephalus
Side-by-Side Comparison
| 属性 | Black-headed Duck | White-headed Steamerduck |
|---|---|---|
| 学名 | Heteronetta atricapilla | Tachyeres leucocephalus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Vulnerable |
| 体長 | — | — |
| 翼開長 | 34.7 cm (13.7 in) | 55.0 cm (21.7 in) |
| 体重 | 528.5 g (18.64 oz) | 3250.0 g (114.64 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dabbles for aquatic invertebrates, seeds, and plant material in shallow water; diet shifts more toward … |
| 一腹卵数 | 2 | 3-6 |
| Population Trend | — | — |
Habitat Comparison
White-headed Steamerduck
Rocky coastal shores, sea channels, and sheltered bays along the Patagonian coast of Chubut Province, Argentina. Flightless; strictly coastal. Nests on rocky headlands. Very limited geographic range.
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-headed Steamerduck
A deep, rattling call from Patagonian coastal habitat. VU status; calls similar to Magellanic Steamerduck but possibly subtly distinct. Vocalizations in wild remain understudied.
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-headed Steamerduck
Breeds across northern Canada in boreal and sub-Arctic lakes; winters on the Atlantic and Gulf coasts of North America.
保全状況
Black-headed Duck
White-headed Steamerduck
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-headed Steamerduck
Flightless. Males have white head and neck contrasting with dark gray-brown body; orange bill. Females brown with white facial markings and less contrasting head. Restricted to Chubut, Argentina coast.
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-headed Steamerduck
チョエノスステームアーダックはアルゼンチン南部のチョエノス群島に固有の飛べないカモです。白い頭部と大きな体が特徴的です。沿岸の島嶼の岩礁地帯に生息し、貝類、甲殻類、海藻を採食します。フォークランドスティーマーダックに近縁です。