American Black Duck vs White-headed Steamerduck
Anas rubripes 比較対象 Tachyeres leucocephalus
Side-by-Side Comparison
| 属性 | American Black Duck | White-headed Steamerduck |
|---|---|---|
| 学名 | Anas rubripes | Tachyeres leucocephalus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Vulnerable |
| 体長 | — | — |
| 翼開長 | 53.4 cm (21.0 in) | 55.0 cm (21.7 in) |
| 体重 | 1211.25 g (42.73 oz) | 3250.0 g (114.64 oz) |
| 食性 | -- | -- |
| 一腹卵数 | 1-17 | 3-6 |
| 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.
White-headed Steamerduck
Rocky coastal shores, sea channels, and sheltered bays along the Patagonian coast of Chubut Province, Argentina. Flightless; strictly coastal. Nests on rocky headlands. Very limited geographic range.
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.
White-headed Steamerduck
A deep, rattling call from Patagonian coastal habitat. VU status; calls similar to Magellanic Steamerduck but possibly subtly distinct. Vocalizations in wild remain understudied.
保全状況
American Black Duck
White-headed Steamerduck
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 …
White-headed Steamerduck
Flightless. Males have white head and neck contrasting with dark gray-brown body; orange bill. Females brown with white facial markings and less contrasting head. Restricted to Chubut, Argentina coast.
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。
White-headed Steamerduck
チョエノスステームアーダックはアルゼンチン南部のチョエノス群島に固有の飛べないカモです。白い頭部と大きな体が特徴的です。沿岸の島嶼の岩礁地帯に生息し、貝類、甲殻類、海藻を採食します。フォークランドスティーマーダックに近縁です。