Laysan Duck vs Spotted Whistling-duck
Anas laysanensis comparado con Dendrocygna guttata
Side-by-Side Comparison
| Atributo | Laysan Duck | Spotted Whistling-duck |
|---|---|---|
| Nombre científico | Anas laysanensis | Dendrocygna guttata |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Critically Endangered | Least Concern |
| Longitud | — | — |
| Envergadura | 39,7 cm (15.6 in) | 41,3 cm (16.3 in) |
| Peso | 465,25 g (16.41 oz) | 677,5 g (23.90 oz) |
| Dieta | Dives for small fish, aquatic invertebrates, and amphibians; serrated bill grips prey; diet fish-heavy in … | Primarily herbivorous; grazes tundra grasses and sedges; winters on coastal marshes and farmland, switching to … |
| Tamaño de la puesta | 9-13 | 10-11 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Laysan Duck only
Ninguno
Spotted Whistling-duck only
Ninguno
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.
Spotted Whistling-duck
Freshwater wetlands, rice fields, streams, and forest pools in New Guinea, Sulawesi, the Philippines, and Moluccas. Often found near forested rivers and seasonal swamps at low elevations.
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.
Spotted Whistling-duck
A musical, high whistle similar to other whistling-ducks. Call is softer and less far-carrying than White-faced or Black-bellied species. Given in flight and on water.
Geographic Range & Migration
Laysan Duck
Resident in West Africa from Senegal to Nigeria; inhabits rainforest streams and swamps. Sedentary and locally common.
Spotted Whistling-duck
Ranges widely across sub-Saharan Africa in open woodland and savanna. Largely sedentary with local seasonal movements to water.
Estado de conservación
Laysan Duck
Spotted Whistling-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 …
Spotted Whistling-duck
Dark brown above; head and neck dark brown. Underparts heavily spotted white on dark brown ground, giving spotted appearance. Flanks with bold white spots. Pink-red bill and legs. Sexes similar.
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.
Spotted Whistling-duck
El pato silbador moteado es un pato silbador de Indonesia, Filipinas y Nueva Guinea, fácilmente reconocible por el plumaje marrón oscuro con manchas blancas en los flancos. Habita en bosques húmedos tropicales con estanques, pantanos y arrozales. Como todos los patos silbadores, tiene un llamado silbante característico y postura erguida. Está clasificado como casi amenazado.