Hawaiian Duck vs Black-headed Duck
Anas wyvilliana comparado con Heteronetta atricapilla
Side-by-Side Comparison
| Atributo | Hawaiian Duck | Black-headed Duck |
|---|---|---|
| Nombre científico | Anas wyvilliana | Heteronetta atricapilla |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Vulnerable | Least Concern |
| Longitud | — | — |
| Envergadura | 44,0 cm (17.3 in) | 34,7 cm (13.7 in) |
| Peso | 573,25 g (20.22 oz) | 528,5 g (18.64 oz) |
| Dieta | Fish-diving duck of South American rivers; uses serrated bill to catch fish and aquatic invertebrates; … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Tamaño de la puesta | 9-13 | 2 |
| Population Trend | — | — |
Habitat Comparison
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
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.
Black-headed Duck
Male gives a soft, raspy peeping note; female produces a muted quack. An obligate brood parasite with reduced vocalizations; subdued calls suit its secretive lifestyle among Argentine reeds.
Geographic Range & Migration
Hawaiian Duck
Ranges across sub-Saharan Africa in open grasslands and wetland edges. Locally nomadic following seasonal rainfall patterns.
Black-headed Duck
Resident in southern South America from southern Brazil and Bolivia south to Argentina and Chile. Found on lakes and marshes in open lowlands.
Estado de conservación
Hawaiian Duck
Black-headed 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 …
Black-headed Duck
Male has distinctive jet-black head and neck, warm chestnut-brown back, and pale buff underparts; blue-grey bill with red base. Female is streaked brown above with pale supercilium and whitish underparts.
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.
Black-headed Duck
El pato cabeza negra es un pequeño pato buceador (~530 g) de América del Sur, familia Anatidae, y el único miembro del género Heteronetta. Tiene la cabeza negra en el macho y cuerpo marrón. Parásita de nido obligada: pone sus huevos en los nidos de otras aves acuáticas, especialmente fochas y pollas de agua. Habita en lagos y lagunas con vegetación emergente de Argentina, Bolivia, Brasil, Chile, Paraguay y Uruguay. No cría su propia cría nunca.