Greater White-fronted Goose vs Madagascar Pochard
Anser albifrons 比較対象 Aythya innotata
Side-by-Side Comparison
| 属性 | Greater White-fronted Goose | Madagascar Pochard |
|---|---|---|
| 学名 | Anser albifrons | Aythya innotata |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Critically Endangered |
| 体長 | — | — |
| 翼開長 | 81.6 cm (32.1 in) | 37.4 cm (14.7 in) |
| 体重 | 2471.0 g (87.16 oz) | 685.0 g (24.16 oz) |
| 食性 | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … | -- |
| 一腹卵数 | 3-9 | 6-10 |
| Population Trend | — | — |
Habitat Comparison
共通生息地
Greater White-fronted Goose only
Madagascar Pochard only
None
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.
Madagascar Pochard
Restricted to Lake Matsaborimena in the highlands of northern Madagascar at about 1,500 m altitude. Uses deep-water mountain lakes with aquatic vegetation. Critically Endangered; tiny wild population.
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.
Madagascar Pochard
Critically Endangered; produces a soft, Aythya-like purring and grating quacking. Calls are not well-documented; likely similar to closely related Ferruginous Duck based on phylogeny.
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.
Madagascar Pochard
保全状況
Greater White-fronted Goose
Madagascar Pochard
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 …
Madagascar Pochard
Males have brown head and neck; dark brown back; pale gray flanks with white undertail. White eye. Blue-gray bill. Females browner with pale face patch and brown eye. Critically endangered; …
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。
Madagascar Pochard
マダガスカルポチャードはマダガスカル固有の極めて希少な潜水性カモです。長年にわたり野生絶滅と考えられていましたが、2006年に北部の湖で再発見されました。深水の湖に生息し、水生植物を潜って採食します。現在は飼育繁殖プログラムで個体数回復が図られています。