Black Swan vs Gadwall
Cygnus atratus เปรียบเทียบกับ Mareca strepera
Side-by-Side Comparison
| คุณสมบัติ | Black Swan | Gadwall |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Cygnus atratus | Mareca strepera |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Least Concern |
| ความยาว | 130.0 cm (51.2 in) | — |
| กว้างปีก | 190.0 cm (74.8 in) | 50.3 cm (19.8 in) |
| น้ำหนัก | 6200.0 g (218.70 oz) | 857.5 g (30.25 oz) |
| อาหาร | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … | Dabbles for seeds and aquatic invertebrates; diet shifts toward invertebrates in spring; forages in shallow … |
| จำนวนไข่ | 4-6 | 5-15 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Gadwall
Freshwater lakes, reservoirs, marshes, and rivers with emergent vegetation across Eurasia and North America. Winters on large open wetlands and coastal estuaries. Range and population increasing in Europe.
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.
Gadwall
Male utters a soft, nasal nheck note; female produces a series of descending, quacking notes. Both sexes are relatively quiet; female's quacking is softer and less strident than a Mallard.
Geographic Range & Migration
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Gadwall
Found year-round in Australia and New Zealand; nomadic in arid Australia, following temporary rainfall-fed wetlands.
สถานะการอนุรักษ์
Black Swan
Gadwall
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
Gadwall
Males have finely vermiculated gray-brown plumage with black rump and undertail. White speculum patch diagnostic in flight. Females mottled brown like Mallard but smaller and with orange-sided bill. Subtle but …
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.
Gadwall
A medium-sized dabbling duck. Males appear grey-brown but are intricately patterned with fine grey vermiculations, black rump, and white speculum. Females resemble Mallard but with orange-sided bill. Widespread across Eurasia and North America. Feeds by dabbling and grazing.