American Black Duck vs Swan Goose
Anas rubripes comparado con Anser cygnoid
Side-by-Side Comparison
| Atributo | American Black Duck | Swan Goose |
|---|---|---|
| Nombre científico | Anas rubripes | Anser cygnoid |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Endangered |
| Longitud | — | — |
| Envergadura | 53,4 cm (21.0 in) | 84,4 cm (33.2 in) |
| Peso | 1211,25 g (42.73 oz) | 3343,75 g (117.95 oz) |
| Dieta | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Herbivore; grazes aquatic plants and grasses at wetland margins; takes invertebrates in spring; diet shifts … |
| Tamaño de la puesta | 1-17 | 4-8 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
American Black Duck only
Swan Goose only
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.
Swan Goose
Breeds on steppe lakes, rivers, and meadows in Mongolia, Siberia, and northeastern China. Winters in eastern China's Yangtze River floodplain and coastal wetlands. Wild populations critically small.
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.
Swan Goose
A deep, resonant 'honk'; less frequently heard than Greylag. The EN status reflects serious population decline; vocalizations are considered similar to Greylag Goose.
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Swan Goose
Breeds in the tundra and boreal zones of Alaska and Canada; winters on the Pacific coast from British Columbia to California.
Estado de conservación
American Black Duck
Swan 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 …
Swan Goose
Long neck with rich chestnut hindneck stripe. Forehead and crown dark brown; face and throat whitish. Upperparts grayish-brown; underparts pale. Long black bill. Pink legs. Ancestor of Chinese domestic geese.
About These Birds
American Black Duck
El pato negro americano es un gran pato de color marrón muy oscuro con una cabeza más clara y un llamativo espéculo alar púrpura. Habita en humedales del este de Norteamérica y se está hibridando cada vez más con el pato de collar introducido en su rango, lo que representa una amenaza para su pureza genética. Prefiere marismas costeras, pantanos boscosos y lagos tranquilos.
Swan Goose
El ganso cisne es un gran ganso asiático con el cuello largo y esbelto y un llamativo pico largo y negro con un prominente nódulo en la base. Es el antecesor del ganso doméstico chino. Cría en la estepa y el semidesierto de Asia central y Mongolia y migra al este de China para pasar el invierno. Su población ha disminuido por la degradación del hábitat y la caza.