Wandering Whistling-duck vs Knob-billed Duck
Dendrocygna arcuata comparado com Sarkidiornis melanotos
Side-by-Side Comparison
| Atributo | Wandering Whistling-duck | Knob-billed Duck |
|---|---|---|
| Nome científico | Dendrocygna arcuata | Sarkidiornis melanotos |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | — | — |
| Envergadura | 37,2 cm (14.6 in) | 64,2 cm (25.3 in) |
| Peso | 779,5 g (27.50 oz) | 1817,5 g (64.11 oz) |
| Dieta | Eats grasses, sedges, and aquatic plants in tundra; winter diet of coastal salt marsh grasses … | Dabbles for seeds and aquatic invertebrates; diet shifts toward invertebrate prey in spring breeding season; … |
| Tamanho da postura | 6-15 | 6-20 |
| Population Trend | — | — |
Habitat Comparison
Habitats partilhados
Wandering Whistling-duck only
Nenhum
Knob-billed Duck only
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.
Knob-billed Duck
Freshwater lakes, marshes, floodplains, and forested wetlands across sub-Saharan Africa and South and Southeast Asia from India to southern China. Nests in large tree hollows near water.
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.
Knob-billed Duck
A low, grunting 'wuk' or soft, nasal 'krank'. Similar to Comb Duck in call quality. Generally quiet; calls are not loud or distinctive compared to other large African waterfowl.
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.
Knob-billed Duck
Breeds on sub-Arctic tundra; winters on the Atlantic coast of North America from Labrador to Florida and the Gulf Coast.
Estado de conservação
Wandering Whistling-duck
Knob-billed 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.
Knob-billed Duck
Males have white head with black spots; iridescent dark blue-black back and wings; white underparts with gray flanks. Large black fleshy knob atop bill. Females smaller, brown, and lack the …
About These Birds
Wandering Whistling-duck
O parreco-vagabundo é um pato assobiadeiro encontrado da Indonésia e Filipinas à Austrália. Tem a coloração castanho-avermelhada típica dos parrecos com flancos largamente barrados de castanho-escuro e branco. Habita zonas húmidas de água doce, incluindo lagos, pântanos e planícies inundadas tropicais. É gregário e frequentemente mistura-se com outras espécies de parrecos. Os bandos podem ser muito numerosos durante as estações não reprodutoras.
Knob-billed Duck
O pato-de-crista é um pato grande e incomum encontrado na África, Ásia do Sul e parte da América do Sul. Os machos têm um grande tubérculo negro na base do bico durante a reprodução. A plumagem tem o dorso negro brilhante iridescente e ventre branco. Os flancos variam entre espécies africanas e sul-asiáticas. Habita zonas húmidas tropicais, rios e arrozais. Empoleira-se frequentemente em árvores e nidifica em ocos de árvore.