Spotted Whistling-duck vs Brazilian Merganser
Dendrocygna guttata 比較対象 Mergus octosetaceus
Side-by-Side Comparison
| 属性 | Spotted Whistling-duck | Brazilian Merganser |
|---|---|---|
| 学名 | Dendrocygna guttata | Mergus octosetaceus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Critically Endangered |
| 体長 | — | — |
| 翼開長 | 41.3 cm (16.3 in) | 39.2 cm (15.4 in) |
| 体重 | 677.5 g (23.90 oz) | 827.6666666666666 g (29.20 oz) |
| 食性 | Primarily herbivorous; grazes tundra grasses and sedges; winters on coastal marshes and farmland, switching to … | Dives for small fish in fast-flowing South American rivers. Critically endangered; uses serrated bill to … |
| 一腹卵数 | 10-11 | 5-8 |
| Population Trend | — | — |
Habitat Comparison
Spotted Whistling-duck
Freshwater wetlands, rice fields, streams, and forest pools in New Guinea, Sulawesi, the Philippines, and Moluccas. Often found near forested rivers and seasonal swamps at low elevations.
Song & Call Comparison
Spotted Whistling-duck
A musical, high whistle similar to other whistling-ducks. Call is softer and less far-carrying than White-faced or Black-bellied species. Given in flight and on water.
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
Spotted Whistling-duck
Ranges widely across sub-Saharan Africa in open woodland and savanna. Largely sedentary with local seasonal movements to water.
Brazilian Merganser
Critically endangered; restricted to a few rivers in southern Brazil, Argentina, and Paraguay. Found on fast-flowing rivers in Atlantic Forest.
保全状況
Spotted Whistling-duck
Brazilian Merganser
How to Tell Them Apart
Spotted Whistling-duck
Dark brown above; head and neck dark brown. Underparts heavily spotted white on dark brown ground, giving spotted appearance. Flanks with bold white spots. Pink-red bill and legs. 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
Spotted Whistling-duck
スポッテドウィスリングダックはインドネシア、フィリピン、パプアニューギニアに分布するツリーダックです。白い斑点のある褐色の羽毛が特徴で、夜間に特徴的な笛のような声でさえずります。熱帯の湿地、稲田、マングローブ林に生息し、草の種子や水草を採食します。
Brazilian Merganser
ブラジアンメルガンサーは南米のブラジル南部とアルゼンチン北部に固有の絶滅危惧種です。速い流れの清澄な河川に生息し、魚を主食とします。生息地の森林破壊と河川汚染により個体数が激減しており、最も希少な水鳥の一つです。