American Black Duck vs Green Pygmy-goose
Anas rubripes verglichen mit Nettapus pulchellus
Side-by-Side Comparison
| Merkmal | American Black Duck | Green Pygmy-goose |
|---|---|---|
| Wissenschaftlicher Name | Anas rubripes | Nettapus pulchellus |
| Ordnung | Anseriformes | Anseriformes |
| Familie | Anatidae | Anatidae |
| Erhaltungsstatus | Least Concern | Least Concern |
| Länge | — | — |
| Flügelspannweite | 53,4 cm (21.0 in) | 33,8 cm (13.3 in) |
| Gewicht | 1211,25 g (42.73 oz) | 328,75 g (11.60 oz) |
| Ernährung | 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 … |
| Gelegegröße | 1-17 | 8-12 |
| Population Trend | — | — |
Habitat Comparison
Gemeinsame Lebensräume
Green Pygmy-goose only
-
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.
Erhaltungsstatus
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
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.
Green Pygmy-goose
A tiny dark-green duck with pale spotted underparts, a dark cap, and a short stout bill. Endemic to New Guinea and northern Australia. Found on water-lily-covered billabongs and lakes. Feeds by snatching seeds and petals of aquatic plants from the surface.