American Black Duck vs Crested Shelduck
Anas rubripes เปรียบเทียบกับ Tadorna cristata
Side-by-Side Comparison
| คุณสมบัติ | American Black Duck | Crested Shelduck |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Anas rubripes | Tadorna cristata |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Critically Endangered |
| ความยาว | — | — |
| กว้างปีก | 53.4 cm (21.0 in) | 59.8 cm (23.5 in) |
| น้ำหนัก | 1211.25 g (42.73 oz) | 1235.0 g (43.56 oz) |
| อาหาร | -- | -- |
| จำนวนไข่ | 1-17 | 10 |
| Population Trend | — | — |
Habitat Comparison
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American Black Duck only
Crested Shelduck 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.
Crested Shelduck
Historically known from coastal Korea, Siberia, and possibly Japan. Habitat preferences poorly known; specimens were collected near coasts and rivers. Possibly extinct.
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.
Crested Shelduck
Critically endangered; last confirmed sightings in 1971. No vocalizations reliably recorded. Presumed similar to related shelducks based on phylogeny but effectively unknown.
สถานะการอนุรักษ์
American Black Duck
Crested Shelduck
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 …
Crested Shelduck
Critically rare; known from few specimens. Males dark green head with bushy crest; black and white body with chestnut flanks. Females have white facial markings and brown-barred body. Possibly extinct; …
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.
Crested Shelduck
A mysterious possibly extinct shelduck known from only a handful of specimens collected in Korea and Siberia before 1916. Males had a black head with green sheen, white crest, and colorful body. No confirmed sightings since 1971. Possibly on the edge of extinction or already extinct.