Black-headed Duck vs White-headed Steamerduck
Heteronetta atricapilla 对比 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 |
| 保护状况 | Least Concern | Vulnerable |
| 体长 | — | — |
| 翼展 | 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 … |
| 产卵数 | 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.
保护状况
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
黑头鸭是南美洲的寄生性鸭子，不自己筑巢，而将卵产于其他水鸟（包括其他鸭类、䴙䴘、红鹭等）的巢中，由寄主孵化并抚育。分布于阿根廷、乌拉圭、智利和巴西南部。雄鸟头部黑色，体羽深褐色；雌鸟头部褐色。是唯一真正的全职巢寄生鸭类。
White-headed Steamerduck
白头蒸汽鸭是分布于阿根廷巴塔哥尼亚南部海岸的不会飞行的蒸汽鸭，雄鸟头部白色为特征，是本属中最容易辨认的种类。不会飞翔，以翅膀拍水前进，以软体动物和甲壳类为食。