African Black Duck vs American Wigeon
Anas sparsa 比較対象 Mareca americana
Side-by-Side Comparison
| 属性 | African Black Duck | American Wigeon |
|---|---|---|
| 学名 | Anas sparsa | Mareca americana |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 49.5 cm (19.5 in) | 50.6 cm (19.9 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 938.125 g (33.09 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet heavier in … | Eats seeds, aquatic plants, and invertebrates; dabbles in shallow water; diet more invertebrate-heavy in breeding … |
| 一腹卵数 | 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.
American Wigeon
Breeds on freshwater lakes and marshes in boreal and northern forest of North America. Winters on coastal bays, estuaries, freshwater wetlands, and agricultural fields from the southern United States to Central America.
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.
American Wigeon
Male produces a three-note whew-whew-wheoo whistle; female gives a low grunting purr. The male's clear, looping whistle is distinctive on North American ponds and marshes.
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.
American Wigeon
Resident across Australia and parts of New Guinea. Sedentary in wetlands; locally nomadic in arid interior zones.
保全状況
African Black Duck
American Wigeon
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 …
American Wigeon
Males have white forehead and crown; iridescent green eye patch; pinkish-buff breast; gray flanks; white belly. White forewing patch in flight. Females mottled brown-gray with gray head. Dimorphic.
About These Birds
African Black Duck
アフリカンブラックダックはサハラ以南のアフリカの急流河川に生息する特殊なカモです。暗褐色の羽毛と白い斑点が特徴で、水流の速い清澄な渓流を好みます。繁殖期には縄張り意識が強く、ペアで生活します。急流の水生昆虫や甲殻類を主食とします。
American Wigeon
北米原産のアメリカオカヨシガモ。雄は緑と白の頭部パターンが特徴的で、体長45〜56cm。湖、池、湿地に生息。主に水中植物の葉、茎、根を食べる草食性。北アメリカで越冬し、南アメリカや中央アメリカへも渡る。低危険種。