American Black Duck vs Swan Goose
Anas rubripes 对比 Anser cygnoid
Side-by-Side Comparison
| 属性 | American Black Duck | Swan Goose |
|---|---|---|
| 学名 | Anas rubripes | Anser cygnoid |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Endangered |
| 体长 | — | — |
| 翼展 | 53.4 cm (21.0 in) | 84.4 cm (33.2 in) |
| 体重 | 1211.25 g (42.73 oz) | 3343.75 g (117.95 oz) |
| 食性 | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Herbivore; grazes aquatic plants and grasses at wetland margins; takes invertebrates in spring; diet shifts … |
| 产卵数 | 1-17 | 4-8 |
| Population Trend | — | — |
Habitat Comparison
American Black Duck
Freshwater and brackish wetlands in eastern North America from Atlantic Canada south along the coast to Georgia. Breeds in northern bogs and wetlands. Winters on coastal marshes, estuaries, and freshwater lakes.
Swan Goose
Breeds on steppe lakes, rivers, and meadows in Mongolia, Siberia, and northeastern China. Winters in eastern China's Yangtze River floodplain and coastal wetlands. Wild populations critically small.
Song & Call Comparison
American Black Duck
Female produces a loud, deep quacking series; male gives a low, raspy grunt. Voice is deeper and huskier than a Mallard; pairs call powerfully across northeastern North American wetlands.
Swan Goose
A deep, resonant 'honk'; less frequently heard than Greylag. The EN status reflects serious population decline; vocalizations are considered similar to Greylag Goose.
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Swan Goose
Breeds in the tundra and boreal zones of Alaska and Canada; winters on the Pacific coast from British Columbia to California.
保护状况
American Black Duck
Swan Goose
How to Tell Them Apart
American Black Duck
Sooty dark brown body; head and neck paler buff with dark streaking. Iridescent purple speculum without white border. Males have yellow-green bill; females olive with orange blotches. Silvery underwings in …
Swan Goose
Long neck with rich chestnut hindneck stripe. Forehead and crown dark brown; face and throat whitish. Upperparts grayish-brown; underparts pale. Long black bill. Pink legs. Ancestor of Chinese domestic geese.
About These Birds
American Black Duck
A large dark brown dabbling duck closely resembling a very dark female Mallard, with purple speculum, yellowish-olive bill in males, and orange legs. Common in eastern North America. Hybridizes freely with Mallard; pure populations declining in the interior.
Swan Goose
鸿雁是家鹅（中国鹅）的野生祖先，繁殖于西伯利亚东部和中国北部，越冬于中国长江流域和朝鲜半岛。体型大，颈细长，前额有明显的黑色额疣（雄鸟更为突出），背部深褐色，腹部浅色。以水生植物和农作物为食，被列为易危物种。