Mallard vs Crested Shelduck
Anas platyrhynchos 비교 대상 Tadorna cristata
Side-by-Side Comparison
| 속성 | Mallard | Crested Shelduck |
|---|---|---|
| 학명 | Anas platyrhynchos | Tadorna cristata |
| 목 | Anseriformes | Anseriformes |
| 과 | Anatidae | Anatidae |
| 보전 상태 | Least Concern | Critically Endangered |
| 체장 | 58.0 cm (22.8 in) | — |
| 날개 폭 | 90.0 cm (35.4 in) | 59.8 cm (23.5 in) |
| 체중 | 1100.0 g (38.80 oz) | 1235.0 g (43.56 oz) |
| 식성 | 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; … |
| 산란 수 | 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.
보전 상태
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
가장 잘 알려진 야생 오리로 체장 50–65cm이며, 수컷은 광택 있는 녹색 머리와 노란 부리, 자주빛 갈색 가슴, 흰색 목 고리를 갖는다. 북반구 전역과 호주에 귀화하여 온대 내지 아열대 습지, 호수, 강, 도시 공원에 서식한다. 잡식성으로 식물, 곤충, 작은 어류를 먹는다. 관심 필요 종이다.
Crested Shelduck
A mysterious possibly extinct shelduck known from only a handful of specimens collected in Korea and Siberia before 1916. Males had a black head with green sheen, white crest, and colorful body. No confirmed sightings since 1971. Possibly on the edge of extinction or already extinct.