Hawaiian Duck vs Spotted Whistling-duck
Anas wyvilliana comparado con Dendrocygna guttata
Side-by-Side Comparison
| Atributo | Hawaiian Duck | Spotted Whistling-duck |
|---|---|---|
| Nombre científico | Anas wyvilliana | Dendrocygna guttata |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Vulnerable | Least Concern |
| Longitud | — | — |
| Envergadura | 44,0 cm (17.3 in) | 41,3 cm (16.3 in) |
| Peso | 573,25 g (20.22 oz) | 677,5 g (23.90 oz) |
| Dieta | Fish-diving duck of South American rivers; uses serrated bill to catch fish and aquatic invertebrates; … | 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
Hawaiian Duck only
Ninguno
Spotted Whistling-duck only
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.
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
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.
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
Hawaiian Duck
Ranges across sub-Saharan Africa in open grasslands and wetland edges. Locally nomadic following seasonal rainfall patterns.
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
Hawaiian Duck
Spotted Whistling-duck
How to Tell Them Apart
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 …
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
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.
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.