Black-headed Duck vs White-winged Scoter
Heteronetta atricapilla 对比 Melanitta deglandi
Side-by-Side Comparison
| 属性 | Black-headed Duck | White-winged Scoter |
|---|---|---|
| 学名 | Heteronetta atricapilla | Melanitta deglandi |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 34.7 cm (13.7 in) | 54.0 cm (21.3 in) |
| 体重 | 528.5 g (18.64 oz) | 1647.1666666666667 g (58.10 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for molluscs, crustaceans, and small fish in coastal and inland waters. Favours mussels and … |
| 产卵数 | 2 | 6-16 |
| 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.
White-winged Scoter
Male produces a soft, whistled note; female gives a harsh, grating call. Similar to Velvet Scoter; the female's rasping call carries across North Pacific bays and coastal inlets.
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-winged Scoter
Breeds in boreal forest and tundra of interior North America. Winters along Pacific and Atlantic coasts south to California and the Gulf states.
保护状况
Black-headed Duck
White-winged Scoter
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-winged Scoter
Male is black with conspicuous white secondaries and a white comma-shaped mark below eye; orange-yellow bill with black basal knob. Female dark brownish-black with two pale facial patches and white …
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-winged Scoter
白翅斑海番鸭是北美的大型黑色海鸭，雄鸟全身黑色，翼上具白色翼镜，眼下有白斑，嘴基肉瘤橙色。繁殖于加拿大西部和阿拉斯加的泰加林和苔原，越冬于北太平洋和大西洋沿岸。善深潜，以软体动物和甲壳类为食。常结大群在沿海越冬。