Kelp Goose vs Black-headed Duck
Chloephaga hybrida comparado com Heteronetta atricapilla
Side-by-Side Comparison
| Atributo | Kelp Goose | Black-headed Duck |
|---|---|---|
| Nome científico | Chloephaga hybrida | Heteronetta atricapilla |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | — | — |
| Envergadura | 71,6 cm (28.2 in) | 34,7 cm (13.7 in) |
| Peso | 2735,0 g (96.47 oz) | 528,5 g (18.64 oz) |
| Dieta | 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 … |
| Tamanho da postura | 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.
Estado de conservação
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
O ganso-dos-kelps é um ganso pequeno das costas rochosas da patagónia e Terra do Fogo. Existe um marcante dimorfismo sexual: os machos são completamente brancos enquanto as fêmeas são castanho-escuro com barramento branco. Habita costas marinhas rochosas onde se alimenta de algas e outros organismos marinhos. É um dos poucos gansos a depender fortemente de alimentos marinhos. Nidifica em encostas próximas à costa e defende territórios costeiros durante todo o ano.
Black-headed Duck
O pato-parasita-de-cabeça-preta é um pato único da América do Sul que é um parasita de ninho obrigatório, não construindo o seu próprio ninho. Põe ovos exclusivamente nos ninhos de outros patos, principalmente patos de cauda rígida e macaquinhos-do-pântano. Os machos têm cabeça preta característica e corpo acastanhado. Habita zonas húmidas de água doce na Argentina, Uruguai, sul do Brasil e Chile. As fêmeas têm ovários altamente desenvolvidos e podem pôr muitos ovos ao longo de uma temporada.