Mallard vs Crested Shelduck
Anas platyrhynchos comparado com Tadorna cristata
Side-by-Side Comparison
| Atributo | Mallard | Crested Shelduck |
|---|---|---|
| Nome científico | Anas platyrhynchos | Tadorna cristata |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Critically Endangered |
| Comprimento | 58,0 cm (22.8 in) | — |
| Envergadura | 90,0 cm (35.4 in) | 59,8 cm (23.5 in) |
| Peso | 1100,0 g (38.80 oz) | 1235,0 g (43.56 oz) |
| Dieta | Omnivorous — aquatic plants, seeds, insects, crustaceans, and mollusks. Feeds by dabbling, upending, and grazing … | Possibly extinct; Crested Shelduck fed on seeds, aquatic plants, and invertebrates near East Asian wetlands; … |
| Tamanho da postura | 4-18 | 10 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Mallard
Nearly any wetland habitat including lakes, rivers, ponds, marshes, estuaries, and urban park ponds.
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
Mallard
Female gives the classic 'quack-quack-quack', descending in pitch. Male utters soft nasal 'raeb-raeb'. Both give a high 'gag-gag-gag' when alarmed or taking 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
Mallard
Native across the Northern Hemisphere in North America, Europe, and Asia. Introduced to Australia and New Zealand.
Crested Shelduck
Breeds across the Palearctic; winters from West Africa to South Africa. Uses the western and central Palearctic–African flyways.
Estado de conservação
Mallard
Crested Shelduck
How to Tell Them Apart
Mallard
Breeding males have an iridescent green head, white neck ring, chestnut breast, and grey body. Females are mottled brown. Both sexes show a blue speculum bordered by white.
Broad, flat bill — yellow-green in males, orange-brown in females
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
Mallard
The mallard is the ancestor of most domestic duck breeds and the most abundant and widespread dabbling duck in the world. Males perform elaborate courtship displays including head-bobbing and whistle-grunt calls. Mallards are highly adaptable, thriving in both wilderness and urban environments.
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.