Mexican Duck vs Brent Goose
Anas diazi 对比 Branta bernicla
Side-by-Side Comparison
| 属性 | Mexican Duck | Brent Goose |
|---|---|---|
| 学名 | Anas diazi | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Not Evaluated | Least Concern |
| 体长 | — | — |
| 翼展 | — | 63.9 cm (25.2 in) |
| 体重 | 1003.75 g (35.41 oz) | 1335.0 g (47.09 oz) |
| 食性 | Eats fish, molluscs, and aquatic invertebrates; dives in fresh and salt water; diet shifts between … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 产卵数 | 1-13 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Mexican Duck
Freshwater lakes, marshes, and rivers at 1,000–2,500 m in the highlands of Mexico and the southwestern United States. Uses agricultural ponds and irrigation canals.
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
Mexican Duck
Female gives a Mallard-like, descending quacking series; male utters a soft, nasal grunt. Vocalizations essentially identical to Mallard; found in Mexican interior wetlands and the Rio Grande.
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
Mexican Duck
Breeds in central and eastern Siberia; winters in East Asia, Southeast Asia, and the East African coast.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保护状况
Mexican Duck
Brent Goose
How to Tell Them Apart
Mexican Duck
Similar to Mottled Duck; mottled brown plumage with pale buff head showing dark crown and eye stripe. Iridescent blue-purple speculum with white borders. Yellow-orange bill. Both sexes similar. SW USA …
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
Mexican Duck
墨西哥鸭，也称墨西哥鸭，是一种中型鸭子，栖息于墨西哥中部高原及美国西南部的湿地和河流。其羽色与雌性绿头鸭相似，呈褐色斑驳状，嘴部呈橄榄黄色。雄雌外形相近，常在浅水湿地觅食。该物种被列为濒危物种，受栖息地丧失和与绿头鸭杂交的威胁。
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。