African Black Duck vs Swan Goose
Anas sparsa 对比 Anser cygnoid
Side-by-Side Comparison
| 属性 | African Black Duck | Swan Goose |
|---|---|---|
| 学名 | Anas sparsa | Anser cygnoid |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Endangered |
| 体长 | — | — |
| 翼展 | 49.5 cm (19.5 in) | 84.4 cm (33.2 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 3343.75 g (117.95 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet heavier in … | Herbivore; grazes aquatic plants and grasses at wetland margins; takes invertebrates in spring; diet shifts … |
| 产卵数 | 4-9 | 4-8 |
| Population Trend | — | — |
Habitat Comparison
African Black Duck
Fast-flowing rocky rivers and streams, mountain gorges, and waterfalls from sea level to 4,000 m across sub-Saharan Africa from Ethiopia and Kenya south to the Cape. Requires clear turbulent water with boulders.
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
African Black Duck
Produces a harsh, resonant quacking call; alarm is a loud, emphatic quack repeated rapidly. Both sexes call with strong quacking; pairs duet with synchronized calls along African rivers.
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
African Black Duck
Resident across South and Southeast Asia, from India to southern China and the Philippines. Non-migratory in most of its range.
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
African Black Duck
Swan Goose
How to Tell Them Apart
African Black Duck
Dark blackish-brown plumage with bold white spots on back and scapulars. Iridescent blue-green speculum with white borders. Head dark with pale spots. Bill and legs dark gray. Sexes similar. Fast-flowing …
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
African Black Duck
A medium-sized dark brown duck with white spots on the back, a dark bill, and orange legs. Found along fast-flowing rocky rivers and streams in Africa. Territorial and monogamous; pairs defend stretches of river. Related to Pacific Black Duck.
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。