Wandering Whistling-duck vs Scaly-sided Merganser
Dendrocygna arcuata 比較対象 Mergus squamatus
Side-by-Side Comparison
| 属性 | Wandering Whistling-duck | Scaly-sided Merganser |
|---|---|---|
| 学名 | Dendrocygna arcuata | Mergus squamatus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Endangered |
| 体長 | — | — |
| 翼開長 | 37.2 cm (14.6 in) | 51.2 cm (20.2 in) |
| 体重 | 779.5 g (27.50 oz) | 1145.8 g (40.42 oz) |
| 食性 | Eats grasses, sedges, and aquatic plants in tundra; winter diet of coastal salt marsh grasses … | Dives for fish in fast-flowing East Asian rivers. Endangered; highly piscivorous with serrated bill adapted … |
| 一腹卵数 | 6-15 | 4-14 |
| 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.
Scaly-sided Merganser
Male gives a quiet, low grunting call; female produces a guttural, croaking series. Endangered; calls are poorly known; similar to Red-breasted Merganser but quieter in Manchurian forest 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.
Scaly-sided Merganser
Breeds in southern Russia, northern China, and the Russian Far East. Winters in southern China and Korea. Found on fast-flowing forested rivers.
保全状況
Wandering Whistling-duck
Scaly-sided 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.
Scaly-sided Merganser
Male has iridescent dark green head with long flat crest, white body with distinctive black scaly pattern on flanks, and black back with white patches. Female has brownish-red crested head …
About These Birds
Wandering Whistling-duck
ワンデリングウィスリングダックは東南アジアからオーストラリアにかけて分布するツリーダックです。栗色の羽毛と長い首が特徴で、群れで移動します。湿地、稲田、水草に覆われた湖に生息し、水草、種子、藻類を採食します。
Scaly-sided Merganser
カワアイサはロシア極東と中国東北部の急流河川に繁殖し、東アジアで越冬する潜水性カモです。鱗状の羽毛パターンが名前の由来で、雄は緑光沢の黒い頭部と赤い嘴を持ちます。清澄な河川で魚を潜って採食します。絶滅危惧種です。