Greater White-fronted Goose vs Smew
Anser albifrons 比較対象 Mergellus albellus
Side-by-Side Comparison
| 属性 | Greater White-fronted Goose | Smew |
|---|---|---|
| 学名 | Anser albifrons | Mergellus albellus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 81.6 cm (32.1 in) | 37.5 cm (14.8 in) |
| 体重 | 2471.0 g (87.16 oz) | 658.75 g (23.24 oz) |
| 食性 | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … | Dives for small fish, aquatic insects, and crustaceans in freshwater and coastal habitats. Uses serrated … |
| 一腹卵数 | 3-9 | 5-11 |
| Population Trend | — | — |
Habitat Comparison
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.
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.
Smew
Male gives a soft, crow-like krr note; female produces a grating, rasping call. Both sexes are relatively quiet; the male's harsh, crow-like call is surprisingly low for such a small …
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.
Smew
Breeds in boreal forests of northern Europe and Siberia. Winters on large lakes and coasts from western Europe east to Japan and China.
保全状況
Greater White-fronted Goose
Smew
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 …
Smew
Male is largely white with black eye patch, black lines on back, and fine black lines on flanks creating a cracked-ice pattern. Female has chestnut-red head, white cheeks, and grey …
About These Birds
Greater White-fronted Goose
北極圏で繁殖し、温帯で越冬する大型のガン（体長64〜81cm）。成鳥は白い額と黒い腹部の横縞が特徴。Anser albifrons（マガン）は東アジア、ヨーロッパ、北米の広大な農地や湿地で越冬する。日本では宮城県伊豆沼などが重要な越冬地で、数万羽が集まる壮観な光景が見られる。Anatidae科。
Smew
ミコアイサはユーラシア北部の針葉樹林帯に繁殖し、東アジアで越冬する潜水性カモです。雄は白い体に黒い模様が美しいです。日本では冬鳥として全国の湖沼、池、河川に飛来します。木の洞に営巣し、魚、水生昆虫、甲殻類を潜って採食します。