Black-headed Duck vs Smew
Heteronetta atricapilla comparado con Mergellus albellus
Side-by-Side Comparison
| Atributo | Black-headed Duck | Smew |
|---|---|---|
| Nombre científico | Heteronetta atricapilla | Mergellus albellus |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 34,7 cm (13.7 in) | 37,5 cm (14.8 in) |
| Peso | 528,5 g (18.64 oz) | 658,75 g (23.24 oz) |
| Dieta | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for small fish, aquatic insects, and crustaceans in freshwater and coastal habitats. Uses serrated … |
| Tamaño de la puesta | 2 | 5-11 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Black-headed Duck only
Ninguno
Smew 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.
Smew
Male gives a soft, crow-like krr note; female produces a grating, rasping call. Both sexes are relatively quiet; the male's harsh, crow-like call is surprisingly low for such a small …
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.
Smew
Breeds in boreal forests of northern Europe and Siberia. Winters on large lakes and coasts from western Europe east to Japan and China.
Estado de conservación
Black-headed Duck
Smew
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.
Smew
Male is largely white with black eye patch, black lines on back, and fine black lines on flanks creating a cracked-ice pattern. Female has chestnut-red head, white cheeks, and grey …
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.
Smew
La serreta chica o smew es el más pequeño y quizás el más hermoso de los mergansos. El macho en plumaje nupcial es casi enteramente blanco con finas líneas negras y parches negros en la cara. La hembra tiene la cabeza castaña con las mejillas blancas y el cuerpo gris. Cría en bosques boreales de Europa y Asia, y pasa el invierno en lagos y ríos de Europa occidental.