Wandering Whistling-duck vs Blue Duck
Dendrocygna arcuata 比較対象 Hymenolaimus malacorhynchos
Side-by-Side Comparison
| 属性 | Wandering Whistling-duck | Blue Duck |
|---|---|---|
| 学名 | Dendrocygna arcuata | Hymenolaimus malacorhynchos |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Endangered |
| 体長 | — | — |
| 翼開長 | 37.2 cm (14.6 in) | 45.6 cm (18.0 in) |
| 体重 | 779.5 g (27.50 oz) | 861.75 g (30.40 oz) |
| 食性 | Eats grasses, sedges, and aquatic plants in tundra; winter diet of coastal salt marsh grasses … | Eats aquatic invertebrates, seeds, and plant material; dabbles in shallow fresh water; invertebrate diet peaks … |
| 一腹卵数 | 6-15 | 5-6 |
| 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.
Blue Duck
Fast-flowing clear turbulent mountain rivers and streams in pristine native forest at 300–1,500 m in both main islands of New Zealand. Requires undisturbed riparian habitat with abundant aquatic invertebrates.
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.
Blue Duck
A soft, musical whistle from fast-flowing South Island rivers. Call is a clear 'whio' — giving the bird its Maori name. Also gives a soft, reedy 'squeak'. Endangered; rarely heard.
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.
Blue Duck
Breeds on open prairie wetlands of the Great Plains; winters in shallow estuaries and marshes along the Gulf of Mexico.
保全状況
Wandering Whistling-duck
Blue Duck
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.
Blue Duck
Distinctive slate-blue-gray plumage; breast spotted with chestnut-brown in both sexes. Pale bill with flexible pink lobes at tip. Chestnut eye. Sexes similar; adapted to fast-flowing mountain streams in New Zealand.
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。
Blue Duck
ブルーダックはニュージーランド固有の希少なカモで、ニュージーランドの国鳥の候補の一つです。青灰色の羽毛と岩の間を縫うように飛ぶ能力が特徴的です。急流の清澄な渓流に生息し、水生昆虫を主食とします。