Canvasback vs Spotted Whistling-duck
Aythya valisineria 对比 Dendrocygna guttata
Side-by-Side Comparison
| 属性 | Canvasback | Spotted Whistling-duck |
|---|---|---|
| 学名 | Aythya valisineria | Dendrocygna guttata |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 44.7 cm (17.6 in) | 41.3 cm (16.3 in) |
| 体重 | 1223.25 g (43.15 oz) | 677.5 g (23.90 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet dominated by … | Primarily herbivorous; grazes tundra grasses and sedges; winters on coastal marshes and farmland, switching to … |
| 产卵数 | 2-16 | 10-11 |
| Population Trend | — | — |
Habitat Comparison
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.
Spotted Whistling-duck
Freshwater wetlands, rice fields, streams, and forest pools in New Guinea, Sulawesi, the Philippines, and Moluccas. Often found near forested rivers and seasonal swamps at low elevations.
Song & Call Comparison
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.
Spotted Whistling-duck
A musical, high whistle similar to other whistling-ducks. Call is softer and less far-carrying than White-faced or Black-bellied species. Given in flight and on water.
Geographic Range & Migration
Canvasback
Breeds in wooded wetlands of Canada and the northern United States; winters in the southern US and Central America.
Spotted Whistling-duck
Ranges widely across sub-Saharan Africa in open woodland and savanna. Largely sedentary with local seasonal movements to water.
保护状况
Canvasback
Spotted Whistling-duck
How to Tell Them Apart
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 …
Spotted Whistling-duck
Dark brown above; head and neck dark brown. Underparts heavily spotted white on dark brown ground, giving spotted appearance. Flanks with bold white spots. Pink-red bill and legs. Sexes similar.
About These Birds
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。
Spotted Whistling-duck
斑树鸭是东南亚和西南太平洋的树鸭，分布于印度尼西亚、菲律宾、巴布亚新几内亚及澳大利亚北部。体羽深褐色，胸部和腹部具白色斑点，嘴灰黑色。栖息于热带雨林的湖泊、河流和湿地，以水生植物、种子和无脊椎动物为食，在树洞中营巢。