Kelp Goose vs Black-headed Duck
Chloephaga hybrida comparé à Heteronetta atricapilla
Side-by-Side Comparison
| Attribut | Kelp Goose | Black-headed Duck |
|---|---|---|
| Nom scientifique | Chloephaga hybrida | Heteronetta atricapilla |
| Ordre | Anseriformes | Anseriformes |
| Famille | Anatidae | Anatidae |
| Statut de conservation | Least Concern | Least Concern |
| Longueur | — | — |
| Envergure | 71,6 cm (28.2 in) | 34,7 cm (13.7 in) |
| Poids | 2735,0 g (96.47 oz) | 528,5 g (18.64 oz) |
| Régime alimentaire | Feeds on grasses, seeds, and aquatic invertebrates in coastal wetlands; grazes and dabbles; diet varies … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Taille de la couvée | 3-7 | 2 |
| Population Trend | — | — |
Habitat Comparison
Kelp Goose
Rocky wave-washed shores, sea channels, and kelp-fringed coasts of Patagonian Chile and Argentina south to Tierra del Fuego, and the Falkland Islands. Strictly coastal; almost never moves inland.
Song & Call Comparison
Kelp Goose
A loud, nasal 'honk'. Male is mostly white and gives sharper calls; female is dark and gives softer, lower honks. Coastal Patagonian and Falklands habitat; highly vocal.
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
Kelp Goose
Found in freshwater marshes across sub-Saharan Africa. Largely sedentary with local nomadic movements following rainfall patterns.
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.
Statut de conservation
Kelp Goose
Black-headed Duck
How to Tell Them Apart
Kelp Goose
Extreme dimorphism. Males entirely white with yellow bill and legs. Females dark brown barred white overall; yellow legs. Coastal species of rocky shores. Sexes so different they were once considered …
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
Kelp Goose
A sheldgoose with stark sexual dimorphism: males are entirely white; females are dark brown with white belly and barred flanks. Found exclusively on rocky wave-washed shorelines where it feeds almost entirely on kelp and green algae. Endemic to Patagonian coastline and Falkland Islands.
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.