Brent Goose vs Maned Duck
Branta bernicla 比較対象 Chenonetta jubata
Side-by-Side Comparison
| 属性 | Brent Goose | Maned Duck |
|---|---|---|
| 学名 | Branta bernicla | Chenonetta jubata |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 63.9 cm (25.2 in) | 51.8 cm (20.4 in) |
| 体重 | 1335.0 g (47.09 oz) | 825.25 g (29.11 oz) |
| 食性 | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Eats seeds, aquatic plants, and invertebrates; dabbles in shallow water; broadly omnivorous diet shifts with … |
| 一腹卵数 | 1-10 | 8-11 |
| Population Trend | — | — |
Habitat Comparison
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.
Maned Duck
Open woodland, grassland, parks, golf courses, and farmland near water across most of Australia. Nests in tree hollows up to 30m high. Grazes terrestrially. Highly adaptable to modified and urban environments.
Song & Call Comparison
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.
Maned Duck
Male utters soft, goose-like honking notes; female gives a harsh, repeated quacking rattle. Alarm call is a loud, abrupt nasal honk carrying over open water.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Maned Duck
Found in wetlands of East Africa; largely sedentary with some local seasonal movements following water availability.
保全状況
Brent Goose
Maned Duck
How to Tell Them Apart
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.
Maned Duck
Males have brownish head with short dark mane; gray body with fine vermiculations and chestnut breast spots. Females brown with white supercilium and white chin. Both show white speculum in …
About These Birds
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。
Maned Duck
オーストラリアンウッドダックはオーストラリア全土に分布するカモです。雄は暗褐色の頭部と細かい模様の羽毛が特徴的です。草地や農地に隣接した湿地、池、川に生息します。草、種子、昆虫を採食します。木の洞に営巣します。