American Black Duck vs White-backed Duck
Anas rubripes 对比 Thalassornis leuconotus
Side-by-Side Comparison
| 属性 | American Black Duck | White-backed Duck |
|---|---|---|
| 学名 | Anas rubripes | Thalassornis leuconotus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 53.4 cm (21.0 in) | 33.3 cm (13.1 in) |
| 体重 | 1211.25 g (42.73 oz) | 704.6666666666666 g (24.86 oz) |
| 食性 | -- | -- |
| 产卵数 | 1-17 | 4-10 |
| 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.
White-backed Duck
Freshwater lakes, ponds, and swamps with abundant floating aquatic vegetation, especially water lilies, in sub-Saharan Africa and Madagascar. Prefers shallow sheltered water with emergent vegetation for cover.
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.
White-backed Duck
Soft, low whistles and hissing sounds. The White-backed Duck is relatively quiet compared to whistling-ducks. Alarm call is a low 'peep'. Mostly heard at night.
保护状况
American Black Duck
White-backed Duck
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 …
White-backed Duck
Heavily mottled and barred brown and buff overall. Diagnostic white back patch visible in flight. Head brown with whitish face and chin. Stiff tail held erect. Sexes similar; stiff-tail diving …
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.
White-backed Duck
白背硬尾鸭是非洲唯一的硬尾鸭，主要分布于撒哈拉以南非洲的湖泊和沼泽，以及马达加斯加。体型小，体羽以棕褐色为主，背部白色斑块在飞行时可见，尾羽刚硬。善深潜，主要以睡莲种子和其他水生植物为食。栖息于富有植被的淡水湿地，被列为近危物种。