Black Swan vs Spectacled Duck
Cygnus atratus so với Speculanas specularis
Side-by-Side Comparison
| Thuộc Tính | Black Swan | Spectacled Duck |
|---|---|---|
| Tên Khoa Học | Cygnus atratus | Speculanas specularis |
| Bộ | Anseriformes | Anseriformes |
| Họ | Anatidae | Anatidae |
| Tình Trạng Bảo Tồn | Least Concern | Near Threatened |
| Chiều Dài | 130,0 cm (51.2 in) | — |
| Chiều Dài Sải Cánh | 190,0 cm (74.8 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 6200,0 g (218.70 oz) | 1248,25 g (44.03 oz) |
| Chế Độ Ăn | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … | Eats aquatic plants, seeds, and invertebrates; dabbles in shallow water; diet varies widely between seasons … |
| Số Trứng | 4-6 | 4-9 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Spectacled Duck
Clear fast-flowing rivers and streams in temperate forest from central Chile and adjacent Argentina south to Tierra del Fuego. Requires cold turbulent mountain rivers with riparian forest. Avoids slow or muddy water.
Song & Call Comparison
Black Swan
Gives a musical bugling 'boo-boo-boo' in flight and softer honking on water. Less vocal than Mute Swan; produces a baying call when alarmed. Wings whistle softly in flight.
Spectacled Duck
Emits deep, guttural quacking notes; alarm is a loud, repeated honking bark. Calls are resonant and powerful, carrying far along fast-flowing Patagonian rivers.
Geographic Range & Migration
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Spectacled Duck
Breeds in wetlands from Iceland to Siberia; winters in temperate and subtropical Asia, Europe, and North Africa.
Tình Trạng Bảo Tồn
Black Swan
Spectacled Duck
How to Tell Them Apart
Black Swan
Almost entirely black with white flight feathers visible in flight. Red bill with a white band near the tip. Dark red to reddish-brown iris.
Bright red bill with a pale tip and prominent white band
Spectacled Duck
Dark brown body with fine pale speckling. Distinctive white 'spectacle' rings around eyes. Iridescent greenish-bronze speculum. Underparts pale buff-brown. Bill grayish; legs orange. Andean and Patagonian streams.
About These Birds
Black Swan
The black swan was once considered impossible by Europeans who believed all swans were white, making it a famous philosophical example of inductive reasoning failure. It is the state emblem of Western Australia. Black swans form lifelong pair bonds and both parents share in incubation and care of cygnets.
Spectacled Duck
A large dark brown duck with distinctive white spectacle-like eye-rings, a pale buff face, and a prominent white speculum. Found in fast-flowing forest rivers of southern South America. Shy and elusive; inhabits clear rushing rivers through temperate forest. Also known as the Bronze-winged Duck.