Brent Goose vs Hawaiian Goose
Branta bernicla 对比 Branta sandvicensis
Side-by-Side Comparison
| 属性 | Brent Goose | Hawaiian Goose |
|---|---|---|
| 学名 | Branta bernicla | Branta sandvicensis |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Near Threatened |
| 体长 | — | — |
| 翼展 | 63.9 cm (25.2 in) | 72.8 cm (28.7 in) |
| 体重 | 1335.0 g (47.09 oz) | 2150.0 g (75.84 oz) |
| 食性 | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Eats aquatic plants, algae, and grasses; upends in shallow water to graze submerged vegetation; diet … |
| 产卵数 | 1-10 | 1-6 |
| 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.
Hawaiian Goose
Volcanic slopes, lava flows, coastal grasslands, and shrublands on Maui, Hawai'i, and Kauai. Adapted to rocky terrain with reduced toe webbing. Introduced to other Hawaiian islands. Avoids dense forest.
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.
Hawaiian Goose
A soft, low 'moo-moo' — the murmuring call gives the Nene its Hawaiian name. Also gives honking calls in flight. Less vocal than Canada Goose; distinctive murmuring quality.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Hawaiian Goose
Breeds in sub-Arctic Canada; winters on large lakes and rivers from the Gulf of Mexico north to where water remains open.
保护状况
Brent Goose
Hawaiian Goose
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.
Hawaiian Goose
Buff-tan neck with black and white channeled furrows. Crown and face black; hindneck black. Body gray-brown above; underparts pale with buff breast. Reduced webbing on feet. Sexes similar. State bird …
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。
Hawaiian Goose
夏威夷雁（奈内雁）是夏威夷的州鸟，也是世界上最稀有的雁类之一。特化于夏威夷熔岩地带生活，脚趾间蹼减退，适于在崎岖地面行走。曾因引入哺乳动物捕食和栖息地破坏而濒临灭绝，经人工繁育和再引入计划，数量已从20世纪50年代的不足30只恢复至2000余只。