Ruddy-headed Goose vs Black-headed Duck
Chloephaga rubidiceps comparado con Heteronetta atricapilla
Side-by-Side Comparison
| Atributo | Ruddy-headed Goose | Black-headed Duck |
|---|---|---|
| Nombre científico | Chloephaga rubidiceps | Heteronetta atricapilla |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 65,1 cm (25.6 in) | 34,7 cm (13.7 in) |
| Peso | 1756,8333333333333 g (61.97 oz) | 528,5 g (18.64 oz) |
| Dieta | Feeds on grasses, grain, and aquatic invertebrates; grazes farmland and freshwater margins; diet heavier in … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Tamaño de la puesta | 3-8 | 2 |
| Population Trend | — | — |
Habitat Comparison
Hábitats compartidos
Ruddy-headed Goose only
Black-headed Duck only
Ruddy-headed Goose
Breeds on open tussock grasslands and moorland in Tierra del Fuego and the Falkland Islands. Mainland wintering population on Patagonian grasslands now critically small. Falkland Islands population relatively stable.
Song & Call Comparison
Ruddy-headed Goose
A high, whistled 'whee' from males and a cackling rattle from females. Calls similar to Ashy-headed Goose. Falkland Islands population; calls in open coastal grassland.
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
Ruddy-headed Goose
Breeds in the coastal tundra of Siberia; winters in Southeast Asia and Australia. Long-distance migrant along the East Asian flyway.
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
Ruddy-headed Goose
Black-headed Duck
How to Tell Them Apart
Ruddy-headed Goose
Distinctive rufous-brown head and neck; body barred rufous and black above; underparts buff-white finely barred. Orange-yellow legs. White wing patches in flight. Compact; sexes similar. Falklands and Patagonia.
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
Ruddy-headed Goose
El cauquén colorado es el más pequeño y menos conocido de los cauquenes, en peligro de extinción. Cría en las turberas de Tierra del Fuego y las Islas Malvinas y migra al norte en invierno hasta las pampas de Argentina. Tiene la cabeza y el cuello de color castaño rojizo brillante. Su población ha declinado drásticamente por la depredación por visones introducidos y la caza.
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.