Black-headed Duck vs White-backed Duck
Heteronetta atricapilla comparado con Thalassornis leuconotus
Side-by-Side Comparison
| Atributo | Black-headed Duck | White-backed Duck |
|---|---|---|
| Nombre científico | Heteronetta atricapilla | Thalassornis leuconotus |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 34,7 cm (13.7 in) | 33,3 cm (13.1 in) |
| Peso | 528,5 g (18.64 oz) | 704,6666666666666 g (24.86 oz) |
| Dieta | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Eats aquatic plants, grasses, and seeds; large tropical swan grazing on lake margins and floating … |
| Tamaño de la puesta | 2 | 4-10 |
| Population Trend | — | — |
Habitat Comparison
White-backed Duck
Freshwater lakes, ponds, and swamps with abundant floating aquatic vegetation, especially water lilies, in sub-Saharan Africa and Madagascar. Prefers shallow sheltered water with emergent vegetation for cover.
Song & Call Comparison
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.
White-backed Duck
Soft, low whistles and hissing sounds. The White-backed Duck is relatively quiet compared to whistling-ducks. Alarm call is a low 'peep'. Mostly heard at night.
Geographic Range & Migration
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.
White-backed Duck
Breeds in subarctic Canada; winters along the Atlantic coast from New England to Florida and on the Gulf Coast.
Estado de conservación
Black-headed Duck
White-backed Duck
How to Tell Them Apart
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.
White-backed Duck
Heavily mottled and barred brown and buff overall. Diagnostic white back patch visible in flight. Head brown with whitish face and chin. Stiff tail held erect. Sexes similar; stiff-tail diving …
About These Birds
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.
White-backed Duck
El pato blanquinegro es un pato de cola tiesa africano con un plumaje críptico de color marrón oscuro moteado de blanco. Se distingue por su cabeza de color caqui y el cuello barreado. Habita en pantanos con vegetación densa y lagnas con abundante vegetación flotante en África subsahariana y Madagascar. Está clasificado como casi amenazado.