Black-headed Duck vs Common Eider
Heteronetta atricapilla 对比 Somateria mollissima
Side-by-Side Comparison
| 属性 | Black-headed Duck | Common Eider |
|---|---|---|
| 学名 | Heteronetta atricapilla | Somateria mollissima |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Near Threatened |
| 体长 | — | — |
| 翼展 | 34.7 cm (13.7 in) | 56.0 cm (22.0 in) |
| 体重 | 528.5 g (18.64 oz) | 2042.8333333333333 g (72.06 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for blue mussels, clams, and crustaceans in shallow coastal waters. Swallows shellfish whole and … |
| 产卵数 | 2 | 2-7 |
| 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.
Common Eider
Male produces a loud, resonant ah-WOOO cooing; female gives a deep, guttural quacking series. The male's iconic moaning call echoes across North Atlantic coastlines; a classic seaduck sound.
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.
Common Eider
Breeds on Arctic and subarctic coasts from the North Atlantic to the Pacific. Winters along coasts of northwestern Europe and eastern North America.
保护状况
Black-headed Duck
Common Eider
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.
Common Eider
Male is strikingly pied: white back, neck, and breast contrasting with black cap, belly, and flanks; nape washed pale lime-green. Female uniformly barred warm tawny-brown with darker streaks.
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。
Common Eider
绒鸭是世界上最大的野鸭，以其胸部柔软绒羽（绒鸭绒）著称，人类数百年来收集其绒羽制作高档羽绒制品。雄鸟黑白相间，嘴部较大，绿色饰羽醒目；雌鸟棕褐色。广泛分布于北极和亚北极地区，繁殖于海岸，越冬于温带沿岸。以软体动物和甲壳类为食，善深潜。