Brown Teal vs Brent Goose
Anas chlorotis 对比 Branta bernicla
Side-by-Side Comparison
| 属性 | Brown Teal | Brent Goose |
|---|---|---|
| 学名 | Anas chlorotis | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Near Threatened | Least Concern |
| 体长 | — | — |
| 翼展 | 39.3 cm (15.5 in) | 63.9 cm (25.2 in) |
| 体重 | 683.6 g (24.11 oz) | 1335.0 g (47.09 oz) |
| 食性 | Eats molluscs, crustaceans, and aquatic invertebrates; dives in coastal and freshwater habitats; diet shifts seasonally. | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 产卵数 | 5-6 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Brown Teal
Dense shrubland, forest streams, freshwater ponds, and coastal wetlands in northern New Zealand, especially Northland and predator-free offshore islands. Most active at dusk and dawn.
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
Brown Teal
Female gives a soft, nasal quacking call; male produces a high, whistled peep. Both sexes are quiet; unobtrusive calls suit this threatened New Zealand nocturnal duck.
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
Brown Teal
Breeds in boreal Canada; winters on the Atlantic coast from Nova Scotia to Florida. Dives in saltwater bays and estuaries.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保护状况
Brown Teal
Brent Goose
How to Tell Them Apart
Brown Teal
Dark brown body with fine mottling. Males have iridescent green head sheen, white eye-ring, and chestnut breast. Females duller and browner with paler face and white eye-ring. Iridescent green speculum. …
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
Brown Teal
新西兰棕鸭（Anas chlorotis）是一种小型褐色鸭，雄鸟具白色眼圈，体羽深褐色，胁部栗色，具绿色翼镜。属鸭科（Anatidae），特产于新西兰，分布局限，受到引进掠食者和栖息地丧失的威胁。
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。