Black-headed Duck vs Common Scoter
Heteronetta atricapilla comparado con Melanitta nigra
Side-by-Side Comparison
| Atributo | Black-headed Duck | Common Scoter |
|---|---|---|
| Nombre científico | Heteronetta atricapilla | Melanitta nigra |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 34,7 cm (13.7 in) | 44,2 cm (17.4 in) |
| Peso | 528,5 g (18.64 oz) | 1127,25 g (39.76 oz) |
| Dieta | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for bivalves, especially cockles, mussels, and clams, in shallow coastal seas. Also eats crustaceans … |
| Tamaño de la puesta | 2 | 6-8 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Black-headed Duck only
Ninguno
Common Scoter only
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.
Common Scoter
Male gives a soft, piping whistle; female produces a harsh, rasping call. The male's piping whistle is subtle; female's harsh calls dominate on European winter coasts and estuaries.
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.
Common Scoter
Breeds on moorland and boreal tundra from Iceland and Britain east to western Siberia. Winters on northwestern European coasts and the Baltic Sea.
Estado de conservación
Black-headed Duck
Common 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.
Common Scoter
Male is entirely sooty black without white markings; orange-yellow patch on upper bill with small black knob. Female brownish-black above with contrasting pale cream cheeks and throat.
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.
Common Scoter
El negrón común es el más negro de los negretes, con el macho enteramente negro y solo un pequeño parche amarillo en el pico. Cría en la tundra y los bosques boreales del norte de Europa y Asia occidental, e inverna en las costas del Atlántico norte y el Mar del Norte. En el mar forma grandes y compactas bandadas en reposo conocidas como 'balsas'.