Black-headed Duck vs Harlequin Duck
Heteronetta atricapilla 比較対象 Histrionicus histrionicus
Side-by-Side Comparison
| 属性 | Black-headed Duck | Harlequin Duck |
|---|---|---|
| 学名 | Heteronetta atricapilla | Histrionicus histrionicus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 34.7 cm (13.7 in) | 38.8 cm (15.3 in) |
| 体重 | 528.5 g (18.64 oz) | 553.0 g (19.51 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Forages in fast-flowing streams for aquatic insect larvae, amphipods, and small fish. Dives and clings … |
| 一腹卵数 | 2 | 3-9 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
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.
Harlequin Duck
Male gives a squeaky, mouse-like squeal; female produces a guttural, grunting call. The male's bizarre, high-pitched squealing call is completely unexpected in such a compact seaduck.
Geographic Range & Migration
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.
Harlequin Duck
Breeds on fast-flowing rivers in Iceland, Greenland, and northern North America. Winters along rocky Pacific and Atlantic coasts south to California.
保全状況
Black-headed Duck
Harlequin Duck
How to Tell Them Apart
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.
Harlequin Duck
Male is slate-blue with bold white crescent before eye, white spots and streaks on head, neck, and scapulars, and rich chestnut flanks. Female is dark sooty-brown with three white facial …
About These Birds
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。
Harlequin Duck
アメリカヒメハジロはカナダ・アイスランド・グリーンランドで繁殖し北アメリカ・ヨーロッパの太平洋・大西洋岸で越冬するマガモ族の小型潜水カモ（体長38〜50 cm）。雄は白い斑点・縞模様の灰色・赤褐色の鮮やかな羽衣が特徴。急流の渓流で繁殖し、越冬地では荒波の岩礁海岸に生息。