Red-billed Teal vs American Black Duck
Anas erythrorhyncha 比較対象 Anas rubripes
Side-by-Side Comparison
| 属性 | Red-billed Teal | American Black Duck |
|---|---|---|
| 学名 | Anas erythrorhyncha | Anas rubripes |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 43.0 cm (16.9 in) | 53.4 cm (21.0 in) |
| 体重 | 648.0 g (22.86 oz) | 1211.25 g (42.73 oz) |
| 食性 | Dives for molluscs, crustaceans, and small fish in coastal and freshwater habitats; diet shifts with … | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … |
| 一腹卵数 | 5-13 | 1-17 |
| Population Trend | — | — |
Habitat Comparison
Red-billed Teal
Freshwater lakes, marshes, pans, and flooded fields across sub-Saharan Africa from Ethiopia and Sudan south to the Cape. Nomadic; follows seasonal flooding. Very tolerant of saline conditions.
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
Red-billed Teal
Female produces a loud, nasal quacking series; male gives a soft, nasal grunt. Both sexes call with emphatic, honking quacks that carry across African open wetlands and dams.
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
Red-billed Teal
Breeds in northern Eurasia and Arctic Canada; winters on open ocean in the North Atlantic and North Pacific.
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
Red-billed Teal
American Black Duck
How to Tell Them Apart
Red-billed Teal
Diagnostic bright pink-red bill with dark ridge contrasting with dark brown cap. Body brown, finely scalloped. White sides of face. Pale buff-white speculum with dark border. Sexes similar. Sub-Saharan Africa.
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
Red-billed Teal
レッドビルドダックはアフリカ南部と東部に広く分布するカモです。鮮やかな赤い嘴が最大の特徴で、全身は褐色のまだら模様をしています。湖、池、湿地、稲田に生息し、種子や水草を主食とします。アフリカで最もよく見られるカモの一つです。
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。