Greylag Goose vs Black-headed Duck
Anser anser so với Heteronetta atricapilla
Side-by-Side Comparison
| Thuộc Tính | Greylag Goose | Black-headed Duck |
|---|---|---|
| Tên Khoa Học | Anser anser | Heteronetta atricapilla |
| Bộ | Anseriformes | Anseriformes |
| Họ | Anatidae | Anatidae |
| Tình Trạng Bảo Tồn | Least Concern | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 87,1 cm (34.3 in) | 34,7 cm (13.7 in) |
| Khối Lượng | 3297,5 g (116.32 oz) | 528,5 g (18.64 oz) |
| Chế Độ Ăn | 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 … |
| Số Trứng | 3-12 | 2 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Greylag Goose only
Black-headed Duck only
Không
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.
Tình Trạng Bảo Tồn
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
The ancestor of most domestic geese, with grey-brown plumage, an orange bill, and pale grey forewing visible in flight. Large and boisterous; one of Europe's most familiar geese. Wild birds breed across Eurasia; re-introduced and feral populations now resident in many areas including city parks.
Black-headed Duck
A small diving duck (~530 g) of South America, family Anatidae, and the sole member of genus Heteronetta. Inhabits freshwater marshes and lakes in Argentina, Bolivia, Brazil, Chile, and Uruguay. Unique among waterfowl as an obligate brood parasite, laying eggs in nests of coots and other waterbirds. Feeds on seeds and aquatic invertebrates. Least Concern.