American Black Duck vs Smew
Anas rubripes 比較対象 Mergellus albellus
Side-by-Side Comparison
| 属性 | American Black Duck | Smew |
|---|---|---|
| 学名 | Anas rubripes | Mergellus albellus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 53.4 cm (21.0 in) | 37.5 cm (14.8 in) |
| 体重 | 1211.25 g (42.73 oz) | 658.75 g (23.24 oz) |
| 食性 | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Dives for small fish, aquatic insects, and crustaceans in freshwater and coastal habitats. Uses serrated … |
| 一腹卵数 | 1-17 | 5-11 |
| 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.
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.
Smew
Male gives a soft, crow-like krr note; female produces a grating, rasping call. Both sexes are relatively quiet; the male's harsh, crow-like call is surprisingly low for such a small …
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Smew
Breeds in boreal forests of northern Europe and Siberia. Winters on large lakes and coasts from western Europe east to Japan and China.
保全状況
American Black Duck
Smew
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 …
Smew
Male is largely white with black eye patch, black lines on back, and fine black lines on flanks creating a cracked-ice pattern. Female has chestnut-red head, white cheeks, and grey …
About These Birds
American Black Duck
北米東部の湿地、沼、河川に生息するカモ（体長53〜61cm）。全体的に暗褐色でマガモの雌に似るが、嘴の色や翼鏡の色が異なる。Anas rubripes（アメリカクロガモ）は海岸の塩性湿地から内陸の淡水域まで幅広く利用し、マガモとの雑種が多く観察される。Anatidae科。
Smew
ミコアイサはユーラシア北部の針葉樹林帯に繁殖し、東アジアで越冬する潜水性カモです。雄は白い体に黒い模様が美しいです。日本では冬鳥として全国の湖沼、池、河川に飛来します。木の洞に営巣し、魚、水生昆虫、甲殻類を潜って採食します。