Spotted Whistling-duck vs Gadwall
Dendrocygna guttata 对比 Mareca strepera
Side-by-Side Comparison
| 属性 | Spotted Whistling-duck | Gadwall |
|---|---|---|
| 学名 | Dendrocygna guttata | Mareca strepera |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 41.3 cm (16.3 in) | 50.3 cm (19.8 in) |
| 体重 | 677.5 g (23.90 oz) | 857.5 g (30.25 oz) |
| 食性 | Primarily herbivorous; grazes tundra grasses and sedges; winters on coastal marshes and farmland, switching to … | Dabbles for seeds and aquatic invertebrates; diet shifts toward invertebrates in spring; forages in shallow … |
| 产卵数 | 10-11 | 5-15 |
| 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.
Gadwall
Freshwater lakes, reservoirs, marshes, and rivers with emergent vegetation across Eurasia and North America. Winters on large open wetlands and coastal estuaries. Range and population increasing in Europe.
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.
Gadwall
Male utters a soft, nasal nheck note; female produces a series of descending, quacking notes. Both sexes are relatively quiet; female's quacking is softer and less strident than a Mallard.
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.
Gadwall
Found year-round in Australia and New Zealand; nomadic in arid Australia, following temporary rainfall-fed wetlands.
保护状况
Spotted Whistling-duck
Gadwall
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.
Gadwall
Males have finely vermiculated gray-brown plumage with black rump and undertail. White speculum patch diagnostic in flight. Females mottled brown like Mallard but smaller and with orange-sided bill. Subtle but …
About These Birds
Spotted Whistling-duck
斑树鸭是东南亚和西南太平洋的树鸭，分布于印度尼西亚、菲律宾、巴布亚新几内亚及澳大利亚北部。体羽深褐色，胸部和腹部具白色斑点，嘴灰黑色。栖息于热带雨林的湖泊、河流和湿地，以水生植物、种子和无脊椎动物为食，在树洞中营巢。
Gadwall
赤膀鸭是北美和欧亚大陆广泛分布的水面鸭，雄鸟羽色低调，以其翼后缘的栗红色翼镜为特征，嘴黑色，腿橙色；雌鸟褐色。繁殖于北温带湖泊和沼泽，越冬于温带至亚热带地区。以水生植物为主食，偶尔取食无脊椎动物。