Black Swan vs Crested Shelduck
Cygnus atratus comparado com Tadorna cristata
Side-by-Side Comparison
| Atributo | Black Swan | Crested Shelduck |
|---|---|---|
| Nome científico | Cygnus atratus | Tadorna cristata |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Critically Endangered |
| Comprimento | 130,0 cm (51.2 in) | — |
| Envergadura | 190,0 cm (74.8 in) | 59,8 cm (23.5 in) |
| Peso | 6200,0 g (218.70 oz) | 1235,0 g (43.56 oz) |
| Dieta | Aquatic vegetation and algae, supplemented with grain and pasture grasses. Feeds by upending in shallow … | Possibly extinct; Crested Shelduck fed on seeds, aquatic plants, and invertebrates near East Asian wetlands; … |
| Tamanho da postura | 4-6 | 10 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Black Swan
Lakes, rivers, swamps, and coastal waters across Australia. Also found in ornamental lakes in parks.
Crested Shelduck
Historically known from coastal Korea, Siberia, and possibly Japan. Habitat preferences poorly known; specimens were collected near coasts and rivers. Possibly extinct.
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.
Crested Shelduck
Critically endangered; last confirmed sightings in 1971. No vocalizations reliably recorded. Presumed similar to related shelducks based on phylogeny but effectively unknown.
Geographic Range & Migration
Black Swan
Australia, primarily in the southeast and southwest. Introduced populations in New Zealand, Japan, and western Europe.
Crested Shelduck
Breeds across the Palearctic; winters from West Africa to South Africa. Uses the western and central Palearctic–African flyways.
Estado de conservação
Black Swan
Crested Shelduck
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
Crested Shelduck
Critically rare; known from few specimens. Males dark green head with bushy crest; black and white body with chestnut flanks. Females have white facial markings and brown-barred body. Possibly extinct; …
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.
Crested Shelduck
O pato-de-crista é provavelmente extinto, com os últimos avistamentos confirmados datando de meados do século XX. Era nativo do nordeste da China, Coreia e talvez do Japão. Os machos tinham uma crista verde proeminente, corpo barrado e bico vermelho. Existem apenas quatro espécimes de museu conhecidos. Não foram confirmados avistamentos credíveis nas décadas recentes, embora ocasionalmente se afirme terem sido feitos avistamentos na Coreia do Norte.