Ruddy-headed Goose vs Black-headed Duck
Chloephaga rubidiceps so với Heteronetta atricapilla
Side-by-Side Comparison
| Thuộc Tính | Ruddy-headed Goose | Black-headed Duck |
|---|---|---|
| Tên Khoa Học | Chloephaga rubidiceps | Heteronetta atricapilla |
| Bộ | Anseriformes | Anseriformes |
| Họ | Anatidae | Anatidae |
| Tình Trạng Bảo Tồn | Least Concern | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 65,1 cm (25.6 in) | 34,7 cm (13.7 in) |
| Khối Lượng | 1756,8333333333333 g (61.97 oz) | 528,5 g (18.64 oz) |
| Chế Độ Ăn | 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 … |
| Số Trứng | 3-8 | 2 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
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.
Tình Trạng Bảo Tồn
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
A small sheldgoose with a rich rufous-brown head and neck, buff-white belly, and barred back. One of the world's rarest geese; mainland population now nearly extinct. Breeds in Tierra del Fuego; main stronghold remains the Falkland Islands. Winters on the Argentine pampas.
Black-headed Duck
A small diving duck (~530 g) of South America, family Anatidae, and the sole member of genus Heteronetta. Inhabits freshwater marshes and lakes in Argentina, Bolivia, Brazil, Chile, and Uruguay. Unique among waterfowl as an obligate brood parasite, laying eggs in nests of coots and other waterbirds. Feeds on seeds and aquatic invertebrates. Least Concern.