American Black Duck vs Greylag Goose
Anas rubripes 比較対象 Anser anser
Side-by-Side Comparison
| 属性 | American Black Duck | Greylag Goose |
|---|---|---|
| 学名 | Anas rubripes | Anser anser |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 53.4 cm (21.0 in) | 87.1 cm (34.3 in) |
| 体重 | 1211.25 g (42.73 oz) | 3297.5 g (116.32 oz) |
| 食性 | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Eats shoots, seeds, and aquatic plants; takes invertebrates in shallow water; diet varies between coastal … |
| 一腹卵数 | 1-17 | 3-12 |
| Population Trend | — | — |
Habitat Comparison
American Black Duck
Freshwater and brackish wetlands in eastern North America from Atlantic Canada south along the coast to Georgia. Breeds in northern bogs and wetlands. Winters on coastal marshes, estuaries, and freshwater lakes.
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
American Black Duck
Female produces a loud, deep quacking series; male gives a low, raspy grunt. Voice is deeper and huskier than a Mallard; pairs call powerfully across northeastern North American wetlands.
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.
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Greylag Goose
Breeds across central and northern North America; winters in the southern United States, Mexico, and Central America.
保全状況
American Black Duck
Greylag Goose
How to Tell Them Apart
American Black Duck
Sooty dark brown body; head and neck paler buff with dark streaking. Iridescent purple speculum without white border. Males have yellow-green bill; females olive with orange blotches. Silvery underwings in …
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.
About These Birds
American Black Duck
北米東部の湿地、沼、河川に生息するカモ（体長53〜61cm）。全体的に暗褐色でマガモの雌に似るが、嘴の色や翼鏡の色が異なる。Anas rubripes（アメリカクロガモ）は海岸の塩性湿地から内陸の淡水域まで幅広く利用し、マガモとの雑種が多く観察される。Anatidae科。
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。