American Black Duck vs Ruddy-headed Goose
Anas rubripes 比較対象 Chloephaga rubidiceps
Side-by-Side Comparison
| 属性 | American Black Duck | Ruddy-headed Goose |
|---|---|---|
| 学名 | Anas rubripes | Chloephaga rubidiceps |
| 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) | 65.1 cm (25.6 in) |
| 体重 | 1211.25 g (42.73 oz) | 1756.8333333333333 g (61.97 oz) |
| 食性 | -- | -- |
| 一腹卵数 | 1-17 | 3-8 |
| 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.
Ruddy-headed Goose
Breeds on open tussock grasslands and moorland in Tierra del Fuego and the Falkland Islands. Mainland wintering population on Patagonian grasslands now critically small. Falkland Islands population relatively stable.
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.
Ruddy-headed Goose
A high, whistled 'whee' from males and a cackling rattle from females. Calls similar to Ashy-headed Goose. Falkland Islands population; calls in open coastal grassland.
保全状況
American Black Duck
Ruddy-headed Goose
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 …
Ruddy-headed Goose
Distinctive rufous-brown head and neck; body barred rufous and black above; underparts buff-white finely barred. Orange-yellow legs. White wing patches in flight. Compact; sexes similar. Falklands and Patagonia.
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。
Ruddy-headed Goose
ルディーヘッドガンは南米南端のパタゴニアとフォークランド諸島に分布する小型のガン科鳥類です。雄は赤褐色の頭部と白い腹が特徴的です。草地に生息し、草を採食します。フォークランド諸島の繁殖個体群は激減しており、絶滅危惧種です。