Black-headed Duck vs Comb Duck
Heteronetta atricapilla 对比 Sarkidiornis sylvicola
Side-by-Side Comparison
| 属性 | Black-headed Duck | Comb Duck |
|---|---|---|
| 学名 | Heteronetta atricapilla | Sarkidiornis sylvicola |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 34.7 cm (13.7 in) | 60.9 cm (24.0 in) |
| 体重 | 528.5 g (18.64 oz) | 1817.5 g (64.11 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Feeds on seeds, plant material, and invertebrates; dabbles and sifts shallow water; diet varies widely … |
| 产卵数 | 2 | -- |
| Population Trend | — | — |
Habitat Comparison
Comb Duck
Freshwater lakes, rivers, flooded savannas, and seasonally inundated forest in lowland tropical South America from Panama south to Bolivia, Brazil, and northern Argentina. Nests in tree cavities near permanent water.
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.
Comb Duck
A soft, nasal 'wuk-wuk' call. Both sexes give similar quiet calls. Generally a less vocal duck than most waterfowl. Gives a rattling wingbeat sound during flight.
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.
Comb Duck
Breeds in the prairie pothole region of central North America; winters along the Pacific coast from Alaska to Mexico.
保护状况
Black-headed Duck
Comb 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.
Comb Duck
Males have white head densely spotted black; black back with blue-green iridescence; white underparts with gray flanks. Prominent black fleshy knob on bill. Females smaller, duller, lack knob. South American.
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。
Comb Duck
新大陆栉雁是南美洲和中美洲特有的大型树栖鸭，雄鸟头顶具特征性黑色肉冠，有时被视为非洲栉雁的亚种或独立物种。体羽黑白相间，体侧浅灰色。栖息于热带森林河流和湖泊，在树洞中营巢，以水生植物、谷物和无脊椎动物为食。