Black-headed Duck vs Brazilian Merganser
Heteronetta atricapilla 对比 Mergus octosetaceus
Side-by-Side Comparison
| 属性 | Black-headed Duck | Brazilian Merganser |
|---|---|---|
| 学名 | Heteronetta atricapilla | Mergus octosetaceus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Critically Endangered |
| 体长 | — | — |
| 翼展 | 34.7 cm (13.7 in) | 39.2 cm (15.4 in) |
| 体重 | 528.5 g (18.64 oz) | 827.6666666666666 g (29.20 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for small fish in fast-flowing South American rivers. Critically endangered; uses serrated bill to … |
| 产卵数 | 2 | 5-8 |
| Population Trend | — | — |
Habitat Comparison
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.
Brazilian Merganser
Male produces a harsh, rasping call; female gives a guttural, grunting series. Critically endangered; quiet vocalizations suit its secretive lifestyle in fast-flowing Brazilian mountain rivers.
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.
Brazilian Merganser
Critically endangered; restricted to a few rivers in southern Brazil, Argentina, and Paraguay. Found on fast-flowing rivers in Atlantic Forest.
保护状况
Black-headed Duck
Brazilian Merganser
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.
Brazilian Merganser
Male has dark glossy greenish-black head with long shaggy crest; finely vermiculated grey body, white wing patch. Female similar but with rufous-chestnut wash on head and shorter crest.
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。
Brazilian Merganser
巴西秋沙鸭是南美洲最濒危的鸭类之一，仅分布于巴西南部、阿根廷和巴拉圭的溪流和河流。雄鸟头部深绿色，嘴部橙红色，体羽灰白色具黑色横纹；雌鸟头部棕褐色。由于河流污染、水坝建设和采矿活动，种群数量已不足250只，被列为极危物种。