American Black Duck vs Hawaiian Duck
Anas rubripes comparado con Anas wyvilliana
Side-by-Side Comparison
| Atributo | American Black Duck | Hawaiian Duck |
|---|---|---|
| Nombre científico | Anas rubripes | Anas wyvilliana |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Vulnerable |
| Longitud | — | — |
| Envergadura | 53,4 cm (21.0 in) | 44,0 cm (17.3 in) |
| Peso | 1211,25 g (42.73 oz) | 573,25 g (20.22 oz) |
| Dieta | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Fish-diving duck of South American rivers; uses serrated bill to catch fish and aquatic invertebrates; … |
| Tamaño de la puesta | 1-17 | 9-13 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
American Black Duck only
Hawaiian Duck only
Ninguno
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.
Hawaiian Duck
Freshwater marshes, rivers, reservoirs, and taro fields on Kauai and other Hawaiian islands. Nests in dense vegetation near water. Threatened by hybridization with domestic or feral Mallards.
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.
Hawaiian Duck
Female produces a raspy, descending quacking series; male gives a soft, nasal sound. Calls similar to Mallard but higher-pitched; alarm is a rapid-fire quacking rattle.
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Hawaiian Duck
Ranges across sub-Saharan Africa in open grasslands and wetland edges. Locally nomadic following seasonal rainfall patterns.
Estado de conservación
American Black Duck
Hawaiian Duck
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 …
Hawaiian Duck
Mottled brown plumage; males may show slight green gloss on head but reduced compared to Mallard. Iridescent blue-purple speculum with white borders. Orange bill. Females similar to males; pale buff …
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.
Hawaiian Duck
El pato hawaiano, conocido localmente como koloa maoli, es una especie en peligro de extinción endémica de las islas hawaianas. Estrechamente emparentado con el pato de collar, es de tamaño más pequeño y presenta plumaje marrón moteado en ambos sexos. La pérdida de hábitat y la hibridación con patos de collar introducidos representan graves amenazas para su supervivencia.