American Black Duck vs White-headed Steamerduck
Anas rubripes เปรียบเทียบกับ Tachyeres leucocephalus
Side-by-Side Comparison
| คุณสมบัติ | American Black Duck | White-headed Steamerduck |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Anas rubripes | Tachyeres leucocephalus |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Vulnerable |
| ความยาว | — | — |
| กว้างปีก | 53.4 cm (21.0 in) | 55.0 cm (21.7 in) |
| น้ำหนัก | 1211.25 g (42.73 oz) | 3250.0 g (114.64 oz) |
| อาหาร | -- | -- |
| จำนวนไข่ | 1-17 | 3-6 |
| Population Trend | — | — |
Habitat Comparison
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White-headed Steamerduck only
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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.
สถานะการอนุรักษ์
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
A large dark brown dabbling duck closely resembling a very dark female Mallard, with purple speculum, yellowish-olive bill in males, and orange legs. Common in eastern North America. Hybridizes freely with Mallard; pure populations declining in the interior.
White-headed Steamerduck
A large flightless steamerduck with grey body and an entirely white head in males, found only along the Patagonian coast of Chubut Province, Argentina. One of the rarest ducks in South America; range extends for only about 400 km of coastline.