Greylag Goose vs Black-headed Duck
Anser anser 比較対象 Heteronetta atricapilla
Side-by-Side Comparison
| 属性 | Greylag Goose | Black-headed Duck |
|---|---|---|
| 学名 | Anser anser | Heteronetta atricapilla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 87.1 cm (34.3 in) | 34.7 cm (13.7 in) |
| 体重 | 3297.5 g (116.32 oz) | 528.5 g (18.64 oz) |
| 食性 | Eats shoots, seeds, and aquatic plants; takes invertebrates in shallow water; diet varies between coastal … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| 一腹卵数 | 3-12 | 2 |
| Population Trend | — | — |
Habitat Comparison
Greylag Goose
Breeds on moorland, bogs, freshwater wetlands, and lake margins across Eurasia from Iceland to central Asia. Winters on estuaries, agricultural fields, and wetlands. Feral populations year-round in parks.
Song & Call Comparison
Greylag Goose
A deep, loud 'aahng' honking. The ancestral goose of domesticated geese; its call is the template for the classic 'goose honk'. Flocks are highly vocal in flight.
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
Greylag Goose
Breeds across central and northern North America; winters in the southern United States, Mexico, and Central America.
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
Greylag Goose
Black-headed Duck
How to Tell Them Apart
Greylag Goose
Large and heavy; uniformly gray-brown with pale feather fringes on back. Head and neck grayish-brown. Orange-pink bill; pink legs. Pale gray forewing conspicuous in flight. Ancestor of domestic geese.
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
Greylag Goose
ヨーロッパ、ロシアにかけて繁殖し、地中海周辺や南アジアで越冬するガン（体長75〜90cm）。灰褐色の体とオレンジ色の嘴が特徴的。Anser anser（ハイイロガン）は家禽のガチョウの祖先種で、最も大きく最も一般的な旧世界のガン。湿原、農地、川沿いに生息し、植物を主食とする。Anatidae科。
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。