Laysan Duck vs American Black Duck
Anas laysanensis comparado con Anas rubripes
Side-by-Side Comparison
| Atributo | Laysan Duck | American Black Duck |
|---|---|---|
| Nombre científico | Anas laysanensis | Anas rubripes |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Critically Endangered | Least Concern |
| Longitud | — | — |
| Envergadura | 39,7 cm (15.6 in) | 53,4 cm (21.0 in) |
| Peso | 465,25 g (16.41 oz) | 1211,25 g (42.73 oz) |
| Dieta | Dives for small fish, aquatic invertebrates, and amphibians; serrated bill grips prey; diet fish-heavy in … | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … |
| Tamaño de la puesta | 9-13 | 1-17 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Laysan Duck only
American Black Duck only
Laysan Duck
Restricted to Laysan Island and Midway Atoll in the Hawaiian Islands. Inhabits the central hypersaline lagoon and surrounding vegetation. Feeds on brine shrimp and flies around the lagoon margin.
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
Laysan Duck
Female gives a soft, muffled quacking series; male utters a quiet rasp. Extremely rare; the soft, unobtrusive quacking calls are seldom heard on the remote Laysan Island lagoon.
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
Laysan Duck
Resident in West Africa from Senegal to Nigeria; inhabits rainforest streams and swamps. Sedentary and locally common.
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Estado de conservación
Laysan Duck
American Black Duck
How to Tell Them Apart
Laysan Duck
Brown plumage mottled and streaked buff and dark brown. White eye-ring contrasts with dark face. Both sexes similar; females show reduced white eye ring. Iridescent speculum. Critically endangered; only on …
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
Laysan Duck
El pato de Laysan es uno de los patos más raros del mundo, confinado históricamente al atolón de Laysan en las islas Hawaii del noroeste. Presenta plumaje marrón moteado con un llamativo parche blanco alrededor del ojo. Casi extinguido a principios del siglo XX por la introducción de conejos que destruyeron su hábitat, se ha recuperado lentamente gracias a los esfuerzos de conservación.
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.