African Black Duck vs Greylag Goose
Anas sparsa 对比 Anser anser
Side-by-Side Comparison
| 属性 | African Black Duck | Greylag Goose |
|---|---|---|
| 学名 | Anas sparsa | Anser anser |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 49.5 cm (19.5 in) | 87.1 cm (34.3 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 3297.5 g (116.32 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet heavier in … | Eats shoots, seeds, and aquatic plants; takes invertebrates in shallow water; diet varies between coastal … |
| 产卵数 | 4-9 | 3-12 |
| 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.
Greylag Goose
Breeds on moorland, bogs, freshwater wetlands, and lake margins across Eurasia from Iceland to central Asia. Winters on estuaries, agricultural fields, and wetlands. Feral populations year-round in parks.
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.
Greylag Goose
A deep, loud 'aahng' honking. The ancestral goose of domesticated geese; its call is the template for the classic 'goose honk'. Flocks are highly vocal in flight.
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.
Greylag Goose
Breeds across central and northern North America; winters in the southern United States, Mexico, and Central America.
保护状况
African Black Duck
Greylag 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 …
Greylag Goose
Large and heavy; uniformly gray-brown with pale feather fringes on back. Head and neck grayish-brown. Orange-pink bill; pink legs. Pale gray forewing conspicuous in flight. Ancestor of 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.
Greylag Goose
灰雁是家鹅的野生祖先，广泛分布于欧亚大陆。体型粗壮，羽色灰褐，嘴部呈粉橙色，腿部橙色。繁殖于沼泽、湿地和湖岸，冬季迁徙至南欧、北非及亚洲南部。社群性强，以家庭为单位迁飞，以草地植被、农作物及水生植物为食。