African Black Duck vs Surf Scoter
Anas sparsa 比較対象 Melanitta perspicillata
Side-by-Side Comparison
| 属性 | African Black Duck | Surf Scoter |
|---|---|---|
| 学名 | Anas sparsa | Melanitta perspicillata |
| 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) | 45.3 cm (17.8 in) |
| 体重 | 996.8333333333334 g (35.16 oz) | 1019.75 g (35.97 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet heavier in … | Dives for molluscs, crustaceans, and herring spawn in coastal waters. Uses its distinctive swollen bill … |
| 一腹卵数 | 4-9 | 5-9 |
| 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.
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.
Surf Scoter
Male produces a low, gurgling burble; female gives a crow-like, guttural cawing. The female's rasping, crow-like call is startling; males make soft, liquid gurgling notes during courtship.
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.
Surf Scoter
Breeds in boreal forests and tundra of northern North America. Winters along Pacific and Atlantic coasts south to Baja California and the Carolinas.
保全状況
African Black Duck
Surf Scoter
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 …
Surf Scoter
Male is entirely glossy black except for white patches on forehead and nape; bill tricolored orange, red, and white with black spot. Female sooty-brown with two white facial patches.
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。
Surf Scoter
サーフスコーター。北米固有の海ガモ。雄は黒色の体に白い後頭部と前額の白斑が特徴的で、多彩な色の嘴も目立つ。北米のタイガ湖で繁殖し、冬は太平洋・大西洋沿岸に移動。貝類を主食とする。低危険種。