Greater White-fronted Goose vs Crested Shelduck
Anser albifrons ile kıyaslandığında Tadorna cristata
Side-by-Side Comparison
| Özellik | Greater White-fronted Goose | Crested Shelduck |
|---|---|---|
| Bilimsel Ad | Anser albifrons | Tadorna cristata |
| Takım | Anseriformes | Anseriformes |
| Familya | Anatidae | Anatidae |
| Koruma Durumu | Least Concern | Critically Endangered |
| Uzunluk | — | — |
| Kanat Açıklığı | 81,6 cm (32.1 in) | 59,8 cm (23.5 in) |
| Ağırlık | 2471,0 g (87.16 oz) | 1235,0 g (43.56 oz) |
| Beslenme | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … | -- |
| Kuluçka Büyüklüğü | 3-9 | 10 |
| Population Trend | — | — |
Habitat Comparison
Ortak Yaşam Alanları
Greater White-fronted Goose only
Crested Shelduck only
Hiçbiri
Greater White-fronted Goose
Breeds on Arctic and subarctic tundra and peatlands. Winters on estuaries, agricultural fields, freshwater marshes, and flooded meadows across Europe, Asia, and North America. One of the most widespread geese.
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
Greater White-fronted Goose
A loud, laughing 'kow-lyuk' or musical 'wah-wah'. Gives a distinctive high-pitched yodeling quality lacking in Greylag. Highly vocal in large winter flocks.
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
Greater White-fronted Goose
Breeds in the potholes region of the northern Great Plains; winters in the southern United States and along the Gulf Coast.
Crested Shelduck
Koruma Durumu
Greater White-fronted Goose
Crested Shelduck
How to Tell Them Apart
Greater White-fronted Goose
Brown-gray body with white forehead patch bordered by white band at bill base. Underparts with bold irregular black bars on belly. Orange bill; orange-yellow legs. Juveniles lack white front and …
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
Greater White-fronted Goose
A medium-large goose with a white forehead patch, orange bill, grey-brown plumage, and variable black barring on the belly. Widespread and numerous; one of the most abundant geese in the world. Breeds across the high Arctic; winters in a wide range of temperate wetland and agricultural habitats.
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.