Southern Pintail vs Black-headed Duck
Anas eatoni so với Heteronetta atricapilla
Side-by-Side Comparison
| Thuộc Tính | Southern Pintail | Black-headed Duck |
|---|---|---|
| Tên Khoa Học | Anas eatoni | Heteronetta atricapilla |
| Bộ | Anseriformes | Anseriformes |
| Họ | Anatidae | Anatidae |
| Tình Trạng Bảo Tồn | Vulnerable | Least Concern |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 40,6 cm (16.0 in) | 34,7 cm (13.7 in) |
| Khối Lượng | 497,0 g (17.53 oz) | 528,5 g (18.64 oz) |
| Chế Độ Ăn | Dives for molluscs, crustaceans, and aquatic invertebrates; eats hard-shelled prey; diet shifts between freshwater and … | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … |
| Số Trứng | 2-6 | 2 |
| Population Trend | — | — |
Habitat Comparison
Southern Pintail
Restricted to the sub-Antarctic Kerguelen and Crozet archipelagos. Inhabits freshwater streams, ponds, and coastal wetlands. Largely terrestrial for a duck; forages on land among tussock grasses.
Song & Call Comparison
Southern Pintail
Female produces a quiet, nasal quacking; male gives a soft whistle. Subdued vocalizations suit this sub-Antarctic island duck; calls are seldom heard and rarely documented.
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
Southern Pintail
Breeds in Iceland and high-Arctic Norway; winters on the coasts of northwestern Europe and the British Isles.
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
Southern Pintail
Black-headed Duck
How to Tell Them Apart
Southern Pintail
Brown, mottled plumage; head brown with pale cheeks. Pointed tail; males slightly longer-tailed. Grayish bill. Speculum bronze-green. Sexes similar with modest dimorphism. Subantarctic island endemic; two subspecies.
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
Southern Pintail
A small island duck found on the remote Kerguelen and Crozet archipelagos in the sub-Antarctic Indian Ocean. Closely related to Northern Pintail. Non-migratory island endemic; small population threatened by introduced predators and overgrazing by rabbits.
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.