Chestnut Teal vs Brent Goose
Anas castanea 比較対象 Branta bernicla
Side-by-Side Comparison
| 属性 | Chestnut Teal | Brent Goose |
|---|---|---|
| 学名 | Anas castanea | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 40.4 cm (15.9 in) | 63.9 cm (25.2 in) |
| 体重 | 662.25 g (23.36 oz) | 1335.0 g (47.09 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in shallow water; diet heavier in molluscs in … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 一腹卵数 | 5-17 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Chestnut Teal
Coastal and estuarine wetlands, saltmarshes, estuaries, and coastal freshwater lakes in southeastern and southwestern Australia. More closely tied to coastal habitats than most Australian ducks.
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
Chestnut Teal
Female produces a loud, emphatic quacking series; male gives a high, whistled note. The female's resonant quacking call is a familiar sound of southern Australian coastal wetlands.
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
Chestnut Teal
Breeds in the north-central prairies; winters along the Atlantic and Gulf coasts of the United States.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保全状況
Chestnut Teal
Brent Goose
How to Tell Them Apart
Chestnut Teal
Strong dimorphism. Males have iridescent dark green head; rich chestnut underparts with white flank patch. Brown back; dark undertail. Females mottled brown with pale face. Iridescent green speculum. Australian coastal.
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
Chestnut Teal
チェスナットティールはオーストラリア南東部に固有のカモです。雄は栗色（チェスナット色）の体に緑色の頭部が鮮やかです。沿岸の汽水湿地、潮間帯、河口に生息し、無脊椎動物、種子、水草を採食します。オーストラリア最南端まで分布する唯一のカモです。
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。