Black-headed Duck vs White-winged Scoter
Heteronetta atricapilla comparado con Melanitta deglandi
Side-by-Side Comparison
| Atributo | Black-headed Duck | White-winged Scoter |
|---|---|---|
| Nombre científico | Heteronetta atricapilla | Melanitta deglandi |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 34,7 cm (13.7 in) | 54,0 cm (21.3 in) |
| Peso | 528,5 g (18.64 oz) | 1647,1666666666667 g (58.10 oz) |
| Dieta | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for molluscs, crustaceans, and small fish in coastal and inland waters. Favours mussels and … |
| Tamaño de la puesta | 2 | 6-16 |
| Population Trend | — | — |
Habitat Comparison
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-winged Scoter
Male produces a soft, whistled note; female gives a harsh, grating call. Similar to Velvet Scoter; the female's rasping call carries across North Pacific bays and coastal inlets.
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-winged Scoter
Breeds in boreal forest and tundra of interior North America. Winters along Pacific and Atlantic coasts south to California and the Gulf states.
Estado de conservación
Black-headed Duck
White-winged Scoter
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-winged Scoter
Male is black with conspicuous white secondaries and a white comma-shaped mark below eye; orange-yellow bill with black basal knob. Female dark brownish-black with two pale facial patches and white …
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-winged Scoter
El negrón aliblanco norteamericano es un gran pato marino con el macho negro con un parche blanco oval bajo el ojo y el ala de color blanco. Habita en costas marinas del Pacífico de América del Norte durante el invierno, donde se alimenta principalmente de mejillones, almejas y otros moluscos buceando. Cría en lagos de bosques boreales del norte de Norteamérica.