Black-headed Duck vs Ruddy Duck
Heteronetta atricapilla เปรียบเทียบกับ Oxyura jamaicensis
Side-by-Side Comparison
| คุณสมบัติ | Black-headed Duck | Ruddy Duck |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Heteronetta atricapilla | Oxyura jamaicensis |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Least Concern |
| ความยาว | — | — |
| กว้างปีก | 34.7 cm (13.7 in) | 27.9 cm (11.0 in) |
| น้ำหนัก | 528.5 g (18.64 oz) | 586.6666666666666 g (20.69 oz) |
| อาหาร | Parasitic; adults may feed on aquatic plants, seeds, and invertebrates in South American marshes. Diet … | Dives for aquatic plant seeds, roots, and invertebrates in freshwater marshes. Uses stiff tail as … |
| จำนวนไข่ | 2 | 5-15 |
| Population Trend | — | — |
Habitat Comparison
Song & Call Comparison
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.
Ruddy Duck
Male produces a mechanical, drumming bok-bok-bok staccato beat; female gives a harsh, nasal quack. The male's rapid drum-roll call on the bill during display is startlingly loud and distinctive.
Geographic Range & Migration
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.
Ruddy Duck
Breeds across interior North America from western Canada south to Mexico. Winters on coasts and inland waters south to northern South America.
สถานะการอนุรักษ์
Black-headed Duck
Ruddy Duck
How to Tell Them Apart
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.
Ruddy Duck
Breeding male has vivid rufous-chestnut body, black crown, white cheeks, and bright sky-blue bill; stiff tail often cocked upright. Female is dull brown with pale cheek crossed by single dark …
About These Birds
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.
Ruddy Duck
A compact stiff-tailed diving duck (~590 g) in family Anatidae, males chestnut-bodied with a sky-blue bill in breeding season. Native to North and South America; an introduced invasive in Europe threatening the White-headed Duck through hybridization. Breeds on freshwater marshes; dives for aquatic plants and invertebrates. Least Concern in native range.