African Black Duck vs Trumpeter Swan
Anas sparsa 对比 Cygnus buccinator
Side-by-Side Comparison
| 属性 | African Black Duck | Trumpeter Swan |
|---|---|---|
| 学名 | Anas sparsa | Cygnus buccinator |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 49.5 cm (19.5 in) | 125.1 cm (49.3 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 9975.0 g (351.86 oz) |
| 食性 | -- | Dabbles for seeds, invertebrates, and aquatic plants in shallow water; diet shifts between plant-rich and … |
| 产卵数 | 4-9 | 1-9 |
| 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.
Trumpeter Swan
Large deep-water lakes, slow rivers, and wetland complexes in western and interior North America from Alaska and Canada south to Oregon. Winters on ice-free rivers and coastal estuaries.
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.
Trumpeter Swan
A deep, resonant, French-horn-like bugling 'oh-OH-oh'. The most musical of North American swans. Pairs sing in duet. Very different from the thin whistle of smaller swans.
Geographic Range & Migration
African Black Duck
Trumpeter Swan
Breeds in Alaska and northern Canada; winters along the Pacific and Atlantic coasts from the southern United States to Mexico.
保护状况
African Black Duck
Trumpeter Swan
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 …
Trumpeter Swan
Entirely snow-white plumage in adults. All-black bill lacking yellow patch. Large size; heaviest North American bird. Neck held straight. Juveniles gray-brown, becoming white by second year. Sexes similar.
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.
Trumpeter Swan
号天鹅是北美最大的本土水鸟，体重可达12千克以上。全身白色，嘴部全黑，以飞行时发出低沉的号角般鸣叫而得名。繁殖于阿拉斯加和加拿大西部，越冬于美国西部沿岸地区。曾因羽毛交易而濒临灭绝，经保护措施后数量已恢复。以水生植物、谷物为食。