Greater White-fronted Goose vs Steller's Eider
Anser albifrons comparado com Polysticta stelleri
Side-by-Side Comparison
| Atributo | Greater White-fronted Goose | Steller's Eider |
|---|---|---|
| Nome científico | Anser albifrons | Polysticta stelleri |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Vulnerable |
| Comprimento | — | — |
| Envergadura | 81,6 cm (32.1 in) | 40,7 cm (16.0 in) |
| Peso | 2471,0 g (87.16 oz) | 815,75 g (28.77 oz) |
| Dieta | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … | Eats molluscs, crustaceans, and aquatic invertebrates; dives in shallow coastal and estuarine habitats; diet invertebrate-dominated. |
| Tamanho da postura | 3-9 | 3-10 |
| Population Trend | — | — |
Habitat Comparison
Habitats partilhados
Greater White-fronted Goose only
Steller's Eider only
Nenhum
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.
Steller's Eider
Breeds on low-lying coastal tundra in Arctic Russia and occasionally Alaska. Winters on shallow rocky sea coasts, kelp beds, and sheltered bays in the Baltic Sea and Pacific coast of Alaska. Listed as Vulnerable.
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.
Steller's Eider
Male produces a low, soft cooing note; female gives a guttural, grunting purr. Quieter than other eiders; the male's gentle cooing is unlike the louder calls of the Common Eider.
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.
Steller's Eider
Breeds in boreal Canada and Alaska; winters along Pacific and Atlantic coasts and on large interior lakes of the US.
Estado de conservação
Greater White-fronted Goose
Steller's Eider
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 …
Steller's Eider
Males have white head with green nape spot, black eye patch and chin; orange-buff underparts; black back with white wing patches. Females mottled dark brown with blue speculum bordered white. …
About These Birds
Greater White-fronted Goose
O ganso-de-testa-branca é um ganso cinzento médio com uma característica faixa branca na frente da cabeça e barras pretas irregulares no ventre. Tem distribuição circumolar na tundra ártica onde cria, hibernando mais ao sul. As duas subespécies principais diferem no tamanho do bico e hibernam em diferentes regiões. Alimenta-se de plantas de tundra durante a criação e de pasto e culturas nas suas áreas de hibernada. É uma espécie cinegética amplamente caçada.
Steller's Eider
O êider-de-steller é o menor dos quatro patos êider, com plumagem elaborada e intrincada nos machos. Os machos têm cabeça branca com olhos verdes marcantes, nuca verde, peito laranja-avermelhado e pontos negros no peito. Cria em pântanos de tundra ártica na Rússia e Alaska. As populações do Alaska colapsaram dramaticamente, levando à sua listagem como ameaçada nos Estados Unidos. As causas do declínio ainda não são totalmente compreendidas.