Brent Goose vs Bufflehead
Branta bernicla 比較対象 Bucephala albeola
Side-by-Side Comparison
| 属性 | Brent Goose | Bufflehead |
|---|---|---|
| 学名 | Branta bernicla | Bucephala albeola |
| 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) | 32.2 cm (12.7 in) |
| 体重 | 1335.0 g (47.09 oz) | 400.5 g (14.13 oz) |
| 食性 | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Dives for aquatic insects, crustaceans, and small molluscs in freshwater and coastal habitats. One of … |
| 一腹卵数 | 1-10 | 5-14 |
| 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.
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.
Bufflehead
Male produces a soft, squeaky whistle; female gives a harsh, nasal quack. The male's thin, reedy whistle is barely audible; pairs exchange quiet contact calls at boreal forest ponds.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Bufflehead
Breeds in boreal forest of western and central North America. Winters along both coasts and interior lakes from southern Canada south to Mexico.
保全状況
Brent Goose
Bufflehead
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.
Bufflehead
Male has iridescent green-purple head with a large triangular white patch from behind eye over crown; body clean white except for black back. Female is dark sooty-brown with a single …
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。
Bufflehead
北米最小の潜水ガモ（約400g）、アナチダエ科、雄は大きな白い頭部斑を持つ虹彩色の紫緑の頭部。池や湖の近くの林に繁殖し、キツツキの穴に巣を作る；沿岸の湾と内陸の水域で越冬する。水生無脊椎動物と小魚を食べる。個体数が安定した軽度懸念種。