African Black Duck vs Canvasback
Anas sparsa 对比 Aythya valisineria
Side-by-Side Comparison
| 属性 | African Black Duck | Canvasback |
|---|---|---|
| 学名 | Anas sparsa | Aythya valisineria |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 49.5 cm (19.5 in) | 44.7 cm (17.6 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 1223.25 g (43.15 oz) |
| 食性 | -- | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet dominated by … |
| 产卵数 | 4-9 | 2-16 |
| 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.
Canvasback
Breeds on prairie potholes and boreal lakes across western North America. Winters on large open lakes, reservoirs, estuaries, and Chesapeake Bay. Sensitive to loss of prairie wetlands.
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.
Canvasback
Male produces a low, cooing purr; female gives a harsh, rolling quacking series. Males whisper-call in rolling, cooing notes during courtship; female's harsh quacking is emphatic on North American marshes.
Geographic Range & Migration
African Black Duck
Canvasback
Breeds in wooded wetlands of Canada and the northern United States; winters in the southern US and Central America.
保护状况
African Black Duck
Canvasback
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 …
Canvasback
Males have rich chestnut-red head and neck; black breast; pale canvas-gray body; white flanks. Sloping forehead profile with dark red bill and red eye. Females gray-brown with reddish-brown head. Dimorphic …
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.
Canvasback
帆背潜鸭是北美体型最大的潜鸭，因雄鸟拱形的背部轮廓似帆船而得名。繁殖于北美大平原的草原壶穴湿地，越冬于大西洋和太平洋沿岸海湾。雄鸟头部砖红色，背部灰白色，嘴部细长黑色；雌鸟褐色。主要以水下植物茎根为食，善深潜。