Kelp Goose vs Black-headed Duck
Chloephaga hybrida 对比 Heteronetta atricapilla
Side-by-Side Comparison
| 属性 | Kelp Goose | Black-headed Duck |
|---|---|---|
| 学名 | Chloephaga hybrida | Heteronetta atricapilla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 71.6 cm (28.2 in) | 34.7 cm (13.7 in) |
| 体重 | 2735.0 g (96.47 oz) | 528.5 g (18.64 oz) |
| 食性 | 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 … |
| 产卵数 | 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.
保护状况
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
洛岛雁是分布于南美洲南端麦哲伦地区及福克兰群岛的沿海雁类。体型中等，雄鸟头颈白色，体羽灰白色；雌鸟褐色带黑色横纹。主要栖息于岩质海岸，以潮间带海藻和草地植物为食。该物种有两个亚种，福克兰群岛亚种数量较多且相对稳定。
Black-headed Duck
黑头鸭是南美洲的寄生性鸭子，不自己筑巢，而将卵产于其他水鸟（包括其他鸭类、䴙䴘、红鹭等）的巢中，由寄主孵化并抚育。分布于阿根廷、乌拉圭、智利和巴西南部。雄鸟头部黑色，体羽深褐色；雌鸟头部褐色。是唯一真正的全职巢寄生鸭类。