Emperor Goose vs Black-headed Duck
Anser canagicus 对比 Heteronetta atricapilla
Side-by-Side Comparison
| 属性 | Emperor Goose | Black-headed Duck |
|---|---|---|
| 学名 | Anser canagicus | Heteronetta atricapilla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 74.8 cm (29.4 in) | 34.7 cm (13.7 in) |
| 体重 | 2300.45 g (81.15 oz) | 528.5 g (18.64 oz) |
| 食性 | Grazes aquatic plants and terrestrial grasses; upends in shallow water; winter diet shifts toward grain … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| 产卵数 | 1-8 | 2 |
| Population Trend | — | — |
Habitat Comparison
Emperor Goose
Breeds on coastal tundra near the Bering Sea in Alaska and Chukotka. Winters on rocky coastal shorelines, kelp beds, and intertidal flats along the Aleutian Islands and Alaska Peninsula.
Song & Call Comparison
Emperor Goose
A low, nasal 'clag-clag' call. Less vocal than other Anser geese. Gives contact calls in flocks during Arctic breeding and Pacific coast wintering. Somewhat quiet.
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.
Geographic Range & Migration
Emperor Goose
Breeds in the eastern Arctic of Canada; winters along the Atlantic coast from Newfoundland to Florida and occasionally to Texas.
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.
保护状况
Emperor Goose
Black-headed Duck
How to Tell Them Apart
Emperor Goose
Body plumage blue-gray with black and white feather scalloping. White head and hindneck contrasting with dark throat. Orange-yellow legs. Bill pink-orange. Tail white. Adults striking; sexes similar.
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.
About These Birds
Emperor Goose
皇帝雁是一种中型海雁，繁殖于阿拉斯加西部及西伯利亚东北部，越冬于阿留申群岛沿岸。头部和颈背白色，颈前黑色，形成鲜明对比。主要栖息于海滨苔原和沿海滩涂，以草地植物和海藻为食。受栖息地变化和气候变暖的影响，种群数量已有所下降。
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。