Greater White-fronted Goose vs Brazilian Merganser
Anser albifrons 比較対象 Mergus octosetaceus
Side-by-Side Comparison
| 属性 | Greater White-fronted Goose | Brazilian Merganser |
|---|---|---|
| 学名 | Anser albifrons | Mergus octosetaceus |
| 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) | 39.2 cm (15.4 in) |
| 体重 | 2471.0 g (87.16 oz) | 827.6666666666666 g (29.20 oz) |
| 食性 | Dabbles for aquatic invertebrates, seeds, and plant material; diet shifts heavily toward invertebrates in breeding … | Dives for small fish in fast-flowing South American rivers. Critically endangered; uses serrated bill to … |
| 一腹卵数 | 3-9 | 5-8 |
| Population Trend | — | — |
Habitat Comparison
共通生息地
Greater White-fronted Goose only
Brazilian Merganser 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.
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.
Brazilian Merganser
Male produces a harsh, rasping call; female gives a guttural, grunting series. Critically endangered; quiet vocalizations suit its secretive lifestyle in fast-flowing Brazilian mountain rivers.
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.
Brazilian Merganser
Critically endangered; restricted to a few rivers in southern Brazil, Argentina, and Paraguay. Found on fast-flowing rivers in Atlantic Forest.
保全状況
Greater White-fronted Goose
Brazilian Merganser
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 …
Brazilian Merganser
Male has dark glossy greenish-black head with long shaggy crest; finely vermiculated grey body, white wing patch. Female similar but with rufous-chestnut wash on head and shorter crest.
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。
Brazilian Merganser
ブラジアンメルガンサーは南米のブラジル南部とアルゼンチン北部に固有の絶滅危惧種です。速い流れの清澄な河川に生息し、魚を主食とします。生息地の森林破壊と河川汚染により個体数が激減しており、最も希少な水鳥の一つです。