Yellow-billed Duck vs Black-headed Duck
Anas undulata 比較対象 Heteronetta atricapilla
Side-by-Side Comparison
| 属性 | Yellow-billed Duck | Black-headed Duck |
|---|---|---|
| 学名 | Anas undulata | Heteronetta atricapilla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 48.1 cm (18.9 in) | 34.7 cm (13.7 in) |
| 体重 | 907.6666666666666 g (32.02 oz) | 528.5 g (18.64 oz) |
| 食性 | Dives for fish, frogs, and aquatic invertebrates; uses serrated bill to grip prey; diet shifts … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| 一腹卵数 | 4-12 | 2 |
| Population Trend | — | — |
Habitat Comparison
Yellow-billed Duck
Freshwater lakes, rivers, marshes, and dams across eastern and southern Africa from Ethiopia and Uganda south to the Cape. Tolerates agricultural impoundments and urban wetlands. Largely sedentary.
Song & Call Comparison
Yellow-billed Duck
Female gives a loud, descending quacking series; male utters a soft, raspy rehb note. The female's strong quacking call is the dominant sound at sub-Saharan African wetlands.
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
Yellow-billed Duck
Found across sub-Saharan Africa from Senegal to Ethiopia and south to South Africa. Sedentary in freshwater wetlands.
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.
保全状況
Yellow-billed Duck
Black-headed Duck
How to Tell Them Apart
Yellow-billed Duck
Brown body with scaly pale-edged feathers; head brown with paler face and throat. Diagnostic bright yellow bill with black central stripe. Iridescent green-and-black speculum with white borders. Sexes similar.
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
Yellow-billed Duck
イエローカモはアフリカ東南部に生息するカモで、黄色い嘴が最大の特徴です。内陸の湖、沼地、川、ダムに生息し、水草、種子、無脊椎動物などを採食します。通常は小さな群れを作りますが、乾燥期には数百羽の大群になることもあります。
Black-headed Duck
クロアタマカモはアルゼンチン・チリ・ウルグアイ・ブラジル南部の南アメリカ温帯湖沼・湿地に生息する托卵性のカモ（体長32〜35 cm）。雄は黒い頭と薄い茶色の体が特徴。他のカモ・コオット・ヒクイナの巣に托卵する。育雛しない数少ない水禽の一つ。