Black-headed Duck vs Falkland Steamerduck
Heteronetta atricapilla 比較対象 Tachyeres brachypterus
Side-by-Side Comparison
| 属性 | Black-headed Duck | Falkland Steamerduck |
|---|---|---|
| 学名 | Heteronetta atricapilla | Tachyeres brachypterus |
| 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) | 49.0 cm (19.3 in) |
| 体重 | 528.5 g (18.64 oz) | 3799.0 g (134.01 oz) |
| 食性 | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Eats seeds, sedge shoots, and aquatic invertebrates; dabbles in ponds and marshes; diet varies with … |
| 一腹卵数 | 2 | 4-12 |
| Population Trend | — | — |
Habitat Comparison
Falkland Steamerduck
Exclusive to rocky coasts, sheltered coves, kelp beds, and sea inlets of the Falkland Islands. Flightless; strictly coastal. One of the few bird species entirely endemic to the Falkland Islands.
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.
Falkland Steamerduck
Similar to Magellanic Steamerduck in call quality — harsh, rattling, mechanical. Falkland Island birds' vocalizations adapted for stormy, windswept coastal habitat.
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.
Falkland Steamerduck
Breeds in subarctic boreal ponds of Alaska and Canada; winters coastally from Alaska to California and on the Gulf Coast.
保全状況
Black-headed Duck
Falkland Steamerduck
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.
Falkland Steamerduck
Flightless; males gray with white supercilium and orange bill. Breast grayish-brown; flanks with brown mottling. Females brown with white eye-ring. Yellow-olive bill. Endemic to Falkland Islands.
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。
Falkland Steamerduck
フォークランドスティーマーダックはフォークランド諸島に固有の飛べないカモです。大きな体と短い翼が特徴で、水面を翼で漕いで移動します。沿岸の浅海、岩礁地帯に生息し、貝類、甲殻類、海藻を採食します。