Brazilian Teal vs Brent Goose
Amazonetta brasiliensis 比較対象 Branta bernicla
Side-by-Side Comparison
| 属性 | Brazilian Teal | Brent Goose |
|---|---|---|
| 学名 | Amazonetta brasiliensis | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 36.1 cm (14.2 in) | 63.9 cm (25.2 in) |
| 体重 | 468.0 g (16.51 oz) | 1335.0 g (47.09 oz) |
| 食性 | Dabbles for aquatic invertebrates and seeds; diet shifts toward plant material outside breeding season; forages … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 一腹卵数 | 6-11 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Brazilian Teal
Freshwater lakes, marshes, rivers, flooded forest, and rice paddies across tropical and subtropical South America from Colombia and Venezuela south to northern Argentina. Tolerates natural and agricultural wetlands.
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
Brazilian Teal
Male produces a nasal, whistled wheee-oh note; female gives a short, sharp quack. Pairs call back and forth with clear whistled exchanges along Amazonian rivers.
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
Brazilian Teal
Breeds in Eurasia and winters in tropical regions from Africa to Southeast Asia. Migratory over broad fronts.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保全状況
Brazilian Teal
Brent Goose
How to Tell Them Apart
Brazilian Teal
Males have red bill and legs; brown body with dark brown back, gray head, buff-white face, and dark crown. Females have pale supercilium and paler face. Both show iridescent green …
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
Brazilian Teal
ブラジリアンティールは南米に広く分布する小型のカモです。赤い嘴と緑色の翼鏡が特徴的です。熱帯・亜熱帯の湿地、池、川、稲田に生息し、水草、種子、無脊椎動物を採食します。南米で最も普通に見られるカモの一つです。
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。