Wandering Whistling-duck vs Brazilian Merganser
Dendrocygna arcuata 对比 Mergus octosetaceus
Side-by-Side Comparison
| 属性 | Wandering Whistling-duck | Brazilian Merganser |
|---|---|---|
| 学名 | Dendrocygna arcuata | Mergus octosetaceus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Critically Endangered |
| 体长 | — | — |
| 翼展 | 37.2 cm (14.6 in) | 39.2 cm (15.4 in) |
| 体重 | 779.5 g (27.50 oz) | 827.6666666666666 g (29.20 oz) |
| 食性 | Eats grasses, sedges, and aquatic plants in tundra; winter diet of coastal salt marsh grasses … | Dives for small fish in fast-flowing South American rivers. Critically endangered; uses serrated bill to … |
| 产卵数 | 6-15 | 5-8 |
| Population Trend | — | — |
Habitat Comparison
Wandering Whistling-duck
Tropical freshwater marshes, flooded grasslands, swamps, and lake margins from the Philippines and Indonesia through Papua New Guinea to northern and eastern Australia. Nomadic following wet season flooding.
Song & Call Comparison
Wandering Whistling-duck
A soft whistle 'whi-whi-whi' in flight. Less vocal than other whistling-ducks; flocks tend to be quieter. Given at dawn and dusk during flight to roosting or feeding areas.
Brazilian Merganser
Male produces a harsh, rasping call; female gives a guttural, grunting series. Critically endangered; quiet vocalizations suit its secretive lifestyle in fast-flowing Brazilian mountain rivers.
Geographic Range & Migration
Wandering Whistling-duck
Breeds in Arctic and subarctic regions; winters at sea around the Antarctic pack ice, one of the longest migrations known.
Brazilian Merganser
Critically endangered; restricted to a few rivers in southern Brazil, Argentina, and Paraguay. Found on fast-flowing rivers in Atlantic Forest.
保护状况
Wandering Whistling-duck
Brazilian Merganser
How to Tell Them Apart
Wandering Whistling-duck
Rich chestnut-brown head and neck; dark brown back. Flanks rufous with pale buff streaks and dark spots. Belly blackish. Long, dark pinkish legs. Upright posture typical of whistling-ducks. Sexes similar.
Brazilian Merganser
Male has dark glossy greenish-black head with long shaggy crest; finely vermiculated grey body, white wing patch. Female similar but with rufous-chestnut wash on head and shorter crest.
About These Birds
Wandering Whistling-duck
流苏树鸭分布于东南亚至澳大利亚北部的热带地区，包括印度尼西亚、菲律宾和新几内亚。以翼上具浅色流苏状羽毛为特征。体羽褐色，具栗褐色和白色斑纹。栖息于热带淡水湖泊和沼泽，以水生植物和无脊椎动物为食，常在水中觅食，也在树洞中营巢。
Brazilian Merganser
巴西秋沙鸭是南美洲最濒危的鸭类之一，仅分布于巴西南部、阿根廷和巴拉圭的溪流和河流。雄鸟头部深绿色，嘴部橙红色，体羽灰白色具黑色横纹；雌鸟头部棕褐色。由于河流污染、水坝建设和采矿活动，种群数量已不足250只，被列为极危物种。