Chestnut Teal vs American Black Duck
Anas castanea 比較対象 Anas rubripes
Side-by-Side Comparison
| 属性 | Chestnut Teal | American Black Duck |
|---|---|---|
| 学名 | Anas castanea | Anas rubripes |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 40.4 cm (15.9 in) | 53.4 cm (21.0 in) |
| 体重 | 662.25 g (23.36 oz) | 1211.25 g (42.73 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in shallow water; diet heavier in molluscs in … | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … |
| 一腹卵数 | 5-17 | 1-17 |
| Population Trend | — | — |
Habitat Comparison
Chestnut Teal
Coastal and estuarine wetlands, saltmarshes, estuaries, and coastal freshwater lakes in southeastern and southwestern Australia. More closely tied to coastal habitats than most Australian ducks.
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
Chestnut Teal
Female produces a loud, emphatic quacking series; male gives a high, whistled note. The female's resonant quacking call is a familiar sound of southern Australian coastal wetlands.
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.
Geographic Range & Migration
Chestnut Teal
Breeds in the north-central prairies; winters along the Atlantic and Gulf coasts of the United States.
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
保全状況
Chestnut Teal
American Black Duck
How to Tell Them Apart
Chestnut Teal
Strong dimorphism. Males have iridescent dark green head; rich chestnut underparts with white flank patch. Brown back; dark undertail. Females mottled brown with pale face. Iridescent green speculum. Australian coastal.
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 …
About These Birds
Chestnut Teal
チェスナットティールはオーストラリア南東部に固有のカモです。雄は栗色（チェスナット色）の体に緑色の頭部が鮮やかです。沿岸の汽水湿地、潮間帯、河口に生息し、無脊椎動物、種子、水草を採食します。オーストラリア最南端まで分布する唯一のカモです。
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。