Spotted Whistling-duck vs Red-breasted Merganser
Dendrocygna guttata 比較対象 Mergus serrator
Side-by-Side Comparison
| 属性 | Spotted Whistling-duck | Red-breasted Merganser |
|---|---|---|
| 学名 | Dendrocygna guttata | Mergus serrator |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 41.3 cm (16.3 in) | 46.7 cm (18.4 in) |
| 体重 | 677.5 g (23.90 oz) | 1058.3333333333333 g (37.33 oz) |
| 食性 | Primarily herbivorous; grazes tundra grasses and sedges; winters on coastal marshes and farmland, switching to … | Dives for small fish, crustaceans, and aquatic invertebrates in coastal and freshwater habitats. Pursues fish … |
| 一腹卵数 | 10-11 | 6-14 |
| Population Trend | — | — |
Habitat Comparison
共通生息地
Spotted Whistling-duck only
None
Red-breasted Merganser only
None
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.
Red-breasted Merganser
Male produces a harsh, rasping series of notes; female gives a rough, guttural grunting. The harsh, rattling call is louder than Goosander; pairs and flocks create a rasping coastal cacophony.
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.
Red-breasted Merganser
Circumpolar breeder in boreal and Arctic zones. Winters on coasts and large water bodies south to the Mediterranean and southern Asia.
保全状況
Spotted Whistling-duck
Red-breasted 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.
Red-breasted Merganser
Male has dark green shaggy double crest, speckled chestnut breast band, white collar, and grey flanks; red bill. Female has rufous-brown head with ragged crest blending gradually into grey neck …
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。
Red-breasted Merganser
ウミアイサはユーラシアと北米に繁殖する潜水性カモです。雄は緑色の頭部と二重の冠羽、赤い鋸状の嘴が特徴的です。日本では冬鳥として海岸や湾に飛来します。魚を主食とし、沿岸の海や河川で潜って採食します。