American Black Duck vs Cotton Pygmy-goose
Anas rubripes เปรียบเทียบกับ Nettapus coromandelianus
Side-by-Side Comparison
| คุณสมบัติ | American Black Duck | Cotton Pygmy-goose |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Anas rubripes | Nettapus coromandelianus |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Least Concern |
| ความยาว | — | — |
| กว้างปีก | 53.4 cm (21.0 in) | 31.7 cm (12.5 in) |
| น้ำหนัก | 1211.25 g (42.73 oz) | 343.5 g (12.12 oz) |
| อาหาร | -- | Feeds on aquatic invertebrates, seeds, and plant material; dabbles in shallow water; invertebrate diet peaks … |
| จำนวนไข่ | 1-17 | 6-18 |
| Population Trend | — | — |
Habitat Comparison
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American Black Duck only
Cotton Pygmy-goose only
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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.
Cotton Pygmy-goose
Freshwater lakes, ponds, slow rivers, and rice paddies with aquatic vegetation from India east through Southeast Asia, China, and New Guinea to northern and eastern Australia. Nests in tree holes near water.
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.
Cotton Pygmy-goose
Male emits a rapid, clucking chatter resembling a toy rattle; female responds with soft, muffled quacks. In flight both sexes produce a distinctive whistling wing-beat.
Geographic Range & Migration
American Black Duck
Cotton Pygmy-goose
Breeds in northern Eurasia; winters in the tropics of Africa and Asia. Migratory; routes cross through the Middle East.
สถานะการอนุรักษ์
American Black Duck
Cotton 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 …
Cotton Pygmy-goose
Males white below and white-faced with dark green crown and collar; black back with iridescent green gloss; white wing bar conspicuous in flight. Females brown-gray with pale supercilium. Tiny; perches …
About These Birds
American Black Duck
A large dark brown dabbling duck closely resembling a very dark female Mallard, with purple speculum, yellowish-olive bill in males, and orange legs. Common in eastern North America. Hybridizes freely with Mallard; pure populations declining in the interior.
Cotton Pygmy-goose
A tiny duck with males having striking white head and underparts, black back, and green iridescence on the crown. Found from India to Australia. Perches on aquatic vegetation and nests in tree hollows. Feeds on water lily seeds and aquatic plants. One of the world's smallest ducks.