American Black Duck vs Green Pygmy-goose
Anas rubripes 比較対象 Nettapus pulchellus
Side-by-Side Comparison
| 属性 | American Black Duck | Green Pygmy-goose |
|---|---|---|
| 学名 | Anas rubripes | Nettapus pulchellus |
| 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) | 33.8 cm (13.3 in) |
| 体重 | 1211.25 g (42.73 oz) | 328.75 g (11.60 oz) |
| 食性 | Eats fish and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts toward molluscs … | Eats seeds, aquatic plants, and invertebrates; dabbles in shallow fresh water; diet varies between seasons … |
| 一腹卵数 | 1-17 | 8-12 |
| 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.
Green Pygmy-goose
Lily-covered tropical freshwater billabongs, lagoons, and seasonal floodplains in New Guinea and the tropical Top End of the Northern Territory and Queensland, Australia. Highly dependent on aquatic vegetation.
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.
Green Pygmy-goose
Male gives a high-pitched, melodic two-note whistle; female produces a quiet, nasal grunt. Courtship includes rapid chattering exchanges between paired birds on tropical lagoons.
Geographic Range & Migration
American Black Duck
Breeds in the steppe zone of Central Asia; winters in South Asia, East Africa, and coastal Southeast Asia.
Green Pygmy-goose
Breeds across northern and central Eurasia; winters in tropical Africa and South Asia.
保全状況
American Black Duck
Green Pygmy-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 …
Green Pygmy-goose
Males have dark green head and neck with white cheek patch; dark back; white underparts; flanks gray-green with fine barring. Females duller with brown cap and white face. White wing …
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。
Green Pygmy-goose
グリーンピグミーグースはオーストラリア北部と東南アジアに分布する小型の木巣性カモです。雄は緑色の羽毛と白い斑点が美しいです。熱帯・亜熱帯の水草が豊富な湖、池、湿地に生息し、蓮の種子や水草を採食します。