Red-billed Teal vs Brent Goose
Anas erythrorhyncha 比較対象 Branta bernicla
Side-by-Side Comparison
| 属性 | Red-billed Teal | Brent Goose |
|---|---|---|
| 学名 | Anas erythrorhyncha | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 43.0 cm (16.9 in) | 63.9 cm (25.2 in) |
| 体重 | 648.0 g (22.86 oz) | 1335.0 g (47.09 oz) |
| 食性 | Dives for molluscs, crustaceans, and small fish in coastal and freshwater habitats; diet shifts with … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 一腹卵数 | 5-13 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Red-billed Teal
Freshwater lakes, marshes, pans, and flooded fields across sub-Saharan Africa from Ethiopia and Sudan south to the Cape. Nomadic; follows seasonal flooding. Very tolerant of saline conditions.
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
Red-billed Teal
Female produces a loud, nasal quacking series; male gives a soft, nasal grunt. Both sexes call with emphatic, honking quacks that carry across African open wetlands and dams.
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
Red-billed Teal
Breeds in northern Eurasia and Arctic Canada; winters on open ocean in the North Atlantic and North Pacific.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保全状況
Red-billed Teal
Brent Goose
How to Tell Them Apart
Red-billed Teal
Diagnostic bright pink-red bill with dark ridge contrasting with dark brown cap. Body brown, finely scalloped. White sides of face. Pale buff-white speculum with dark border. Sexes similar. Sub-Saharan Africa.
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
Red-billed Teal
レッドビルドダックはアフリカ南部と東部に広く分布するカモです。鮮やかな赤い嘴が最大の特徴で、全身は褐色のまだら模様をしています。湖、池、湿地、稲田に生息し、種子や水草を主食とします。アフリカで最もよく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。