Radjah Shelduck vs Blue-billed Teal
Radjah radjah 对比 Spatula hottentota
Side-by-Side Comparison
| 属性 | Radjah Shelduck | Blue-billed Teal |
|---|---|---|
| 学名 | Radjah radjah | Spatula hottentota |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保护状况 | Least Concern | Least Concern |
| 体长 | — | — |
| 翼展 | 54.0 cm (21.3 in) | 29.4 cm (11.6 in) |
| 体重 | 883.5 g (31.16 oz) | 269.2 g (9.50 oz) |
| 食性 | Dabbles for seeds and aquatic invertebrates; also grazes on grasses; diet shifts between land and … | Feeds on seeds, aquatic plants, and invertebrates; filter-feeds in shallow water; broadly omnivorous and seasonally … |
| 产卵数 | 6-15 | 5-12 |
| Population Trend | — | — |
Habitat Comparison
Radjah Shelduck
Mangroves, tidal mudflats, tropical coastal wetlands, and freshwater lagoons in New Guinea and the tropical north of Australia (Queensland, Northern Territory, Western Australia). Nests in tree hollows near water.
Blue-billed Teal
Freshwater lakes, marshes, pans, and flooded grasslands across sub-Saharan Africa from Senegal and Sudan south to the Cape. Nomadic; follows seasonal rains. Common but easily overlooked among reed beds.
Song & Call Comparison
Radjah Shelduck
A loud, rattling 'radjah-radjah' or repeated cackling 'rak-rak-rak'. Calls from tropical Australian and New Guinea wetlands. Name is partly onomatopoeic.
Blue-billed Teal
Male utters a soft, teal-like peep; female gives a muted quack. Pairs call quietly in dense papyrus; soft contact calls help birds maintain proximity in thick African marsh vegetation.
Geographic Range & Migration
Radjah Shelduck
Breeds in the eastern Arctic of Russia; winters across southern Asia, from the Indian subcontinent to Southeast Asia.
Blue-billed Teal
Breeds in Arctic and subarctic Eurasia; winters at sea in the North Atlantic and from western Europe to eastern Africa.
保护状况
Radjah Shelduck
Blue-billed Teal
How to Tell Them Apart
Radjah Shelduck
White head and body with chestnut breastband and white-spotted chestnut scapulars. Pink bill and legs. Iridescent green speculum with white bar visible in flight. Sexes similar. Australasian mangrove specialist.
Blue-billed Teal
Small; males have pale blue-gray bill contrasting with brown-gray body. Head finely spotted; underparts barred brown and white. Males show powder-blue forewing in flight. Females browner. African marsh species.
About These Birds
Radjah Shelduck
澳大利亚贝壳鸭（披肩雁鸭）是澳大利亚北部和新几内亚特有的大型鸭子。体型粗壮，头颈白色，胸部有栗褐色胸带，背部黑色，翼上有绿色翼镜。栖息于热带海岸红树林、淡水湿地和河流。以软体动物、甲壳类、昆虫和植物为食，在树洞中营巢。
Blue-billed Teal
霍屯都鸭是非洲的一种小型水面鸭，以南非土著霍屯都人命名，主要分布于撒哈拉以南非洲东部和南部。体型小，雄鸟头颈部蓝灰色，体羽棕褐色有细纹；雌鸟褐色。栖息于淡水湖泊、沼泽和湿地，以水生植物和无脊椎动物为食。