White-winged Duck vs Brent Goose
Asarcornis scutulata 比較対象 Branta bernicla
Side-by-Side Comparison
| 属性 | White-winged Duck | Brent Goose |
|---|---|---|
| 学名 | Asarcornis scutulata | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Critically Endangered | Least Concern |
| 体長 | — | — |
| 翼開長 | 68.3 cm (26.9 in) | 63.9 cm (25.2 in) |
| 体重 | 2950.0 g (104.06 oz) | 1335.0 g (47.09 oz) |
| 食性 | Feeds on seeds, plant material, and aquatic invertebrates; dabbles in shallow water; diet varies widely … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 一腹卵数 | 6-15 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
White-winged Duck
Undisturbed lowland tropical forest near slow rivers, pools, and forest swamps at low elevations in northeastern India, Bangladesh, Myanmar, and Sumatra. Requires large trees with nest cavities near permanent water.
Brent Goose
Breeds on high-Arctic tundra; winters on estuaries, coastal mudflats, saltmarshes, and sea-grass beds along Atlantic and Pacific coastlines. One of the most strictly coastal wintering geese.
Song & Call Comparison
White-winged Duck
Critically endangered; extremely rare in wild. Gives low guttural hissing calls and soft wing-beating sounds. Vocalizations in wild scarcely documented given its rarity.
Brent Goose
A low, guttural 'rronk' or 'ronk-ronk' from flocks. Soft nasal calls in feeding groups. A subtle, understated call for a goose — less loud than most Anser geese.
Geographic Range & Migration
White-winged Duck
Breeds in northern Eurasia; winters in sub-Saharan Africa. A classic Palearctic–African migrant with a wide wintering range.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保全状況
White-winged Duck
Brent Goose
How to Tell Them Apart
White-winged Duck
Dark brown body with pale spotting on head and neck. Bold white wing patch visible in flight. Yellowish-orange bill; legs orange. Head pale buffish-white speckled brown. Critically endangered SE Asian …
Brent Goose
Small; mostly black head, neck, and breast. Small white neck-patch on adults. Back dark brownish-gray; belly pale gray to white depending on subspecies. White undertail coverts. Sexes similar.
About These Birds
White-winged Duck
ホワイトウィングドウッドダックは東南アジアの熱帯雨林に生息する稀少なカモです。翼の白い斑が特徴的な大型のカモです。インド、バングラデシュ、東南アジアの深い熱帯雨林の河川や沼地に生息し、深刻な絶滅危惧種です。
Brent Goose
北極圏で繁殖し、北半球の海岸で越冬する小型のガン（体長55〜66cm）。黒い頭・首・胸に短い白い首輪が特徴。Branta bernicla（コクガン）は主にアマモなどの海草を食べ、干潟や浅い入り江を好む。日本でも北海道・東北の海岸で越冬する姿が見られ、個体数は比較的少ない。Anatidae科。