Brent Goose vs Flying Steamerduck
Branta bernicla 对比 Tachyeres patachonicus
Side-by-Side Comparison
| 属性 | Brent Goose | Flying Steamerduck |
|---|---|---|
| 学名 | Branta bernicla | Tachyeres patachonicus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 63.9 cm (25.2 in) | 57.4 cm (22.6 in) |
| 体重 | 1335.0 g (47.09 oz) | 2620.75 g (92.44 oz) |
| 食性 | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Dabbles for seeds, invertebrates, and aquatic vegetation; widespread; diet varies from predominantly plant-based to invertebrate-rich. |
| 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.
Flying Steamerduck
Freshwater lakes, rivers, coastal bays, and channels in Patagonian Chile and Argentina from the Lakes Region south to Tierra del Fuego. Partially migratory; some populations move to coasts in winter.
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.
Flying Steamerduck
A harsh, rattling 'rrrrr' and nasal calls. Flying Steamerduck can fly (unlike some relatives) and gives vocal calls in flight. Contact calls are clattering and guttural.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Flying Steamerduck
Breeds across the boreal and subarctic zone of North America; winters broadly across the southern United States and Mexico.
保护状况
Brent Goose
Flying Steamerduck
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.
Flying Steamerduck
Males gray with chestnut-brown breast and white eye-stripe. Females brown-gray with white eye-ring and chestnut flanks. Orange-yellow bill. Only Tachyeres species capable of sustained flight. Wings larger.
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。
Flying Steamerduck
可飞蒸汽鸭是南美洲唯一能够飞翔的蒸汽鸭，分布于智利和阿根廷南部的内陆湖泊和河流，部分种群也在沿海活动。体型比不会飞行的亲戚小，翅膀较长。雄鸟头部灰色，雌鸟头部棕褐色。以软体动物、甲壳类和水生昆虫为食。