Brent Goose vs Surf Scoter
Branta bernicla 对比 Melanitta perspicillata
Side-by-Side Comparison
| 属性 | Brent Goose | Surf Scoter |
|---|---|---|
| 学名 | Branta bernicla | Melanitta perspicillata |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 63.9 cm (25.2 in) | 45.3 cm (17.8 in) |
| 体重 | 1335.0 g (47.09 oz) | 1019.75 g (35.97 oz) |
| 食性 | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Dives for molluscs, crustaceans, and herring spawn in coastal waters. Uses its distinctive swollen bill … |
| 产卵数 | 1-10 | 5-9 |
| 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.
Surf Scoter
Male produces a low, gurgling burble; female gives a crow-like, guttural cawing. The female's rasping, crow-like call is startling; males make soft, liquid gurgling notes during courtship.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Surf Scoter
Breeds in boreal forests and tundra of northern North America. Winters along Pacific and Atlantic coasts south to Baja California and the Carolinas.
保护状况
Brent Goose
Surf Scoter
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.
Surf Scoter
Male is entirely glossy black except for white patches on forehead and nape; bill tricolored orange, red, and white with black spot. Female sooty-brown with two white facial patches.
About These Birds
Brent Goose
黑雁是小型海雁，繁殖于北极苔原，越冬于温带沿海地区。全身黑色，颈部有白色斑纹，腹部浅色或深色（因亚种而异）。以海草（大叶藻）和潮间带植物为食，高度依赖沿海湿地。在欧洲和北美分布有多个亚种，其中部分亚种数量因大叶藻减少而受到威胁。
Surf Scoter
丑鸭（白头黑海番鸭）因雄鸟嘴部具大型橙白色斑块，似戴眼镜而得名。全身黑色，嘴部橙白黑三色，头部具白色和锈色斑点；雌鸟褐色。繁殖于北美北部泰加林的湖泊，越冬于北太平洋和大西洋沿岸。善深潜，以软体动物和甲壳类为食。