Knob-billed Duck vs Blue-billed Teal
Sarkidiornis melanotos comparado con Spatula hottentota
Side-by-Side Comparison
| Atributo | Knob-billed Duck | Blue-billed Teal |
|---|---|---|
| Nombre científico | Sarkidiornis melanotos | Spatula hottentota |
| Orden | Anseriformes | Anseriformes |
| Familia | Anatidae | Anatidae |
| Estado de conservación | Least Concern | Least Concern |
| Longitud | — | — |
| Envergadura | 64,2 cm (25.3 in) | 29,4 cm (11.6 in) |
| Peso | 1817,5 g (64.11 oz) | 269,2 g (9.50 oz) |
| Dieta | Dabbles for seeds and aquatic invertebrates; diet shifts toward invertebrate prey in spring breeding season; … | Feeds on seeds, aquatic plants, and invertebrates; filter-feeds in shallow water; broadly omnivorous and seasonally … |
| Tamaño de la puesta | 6-20 | 5-12 |
| Population Trend | — | — |
Habitat Comparison
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.
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
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.
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
Knob-billed Duck
Breeds on sub-Arctic tundra; winters on the Atlantic coast of North America from Labrador to Florida and the Gulf Coast.
Blue-billed Teal
Breeds in Arctic and subarctic Eurasia; winters at sea in the North Atlantic and from western Europe to eastern Africa.
Estado de conservación
Knob-billed Duck
Blue-billed Teal
How to Tell Them Apart
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 …
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
Knob-billed Duck
El pato crestudo africano y asiático es un gran pato arbóreo de África subsahariana, Madagascar y el sur de Asia. Similar al pato crestudo del Nuevo Mundo, el macho tiene una llamativa protuberancia sobre el pico que se vuelve mayor en la época de cría. Es un ave de grandes llanuras inundadas, pantanos y zonas de selva con ríos y lagunas de agua tranquila.
Blue-billed Teal
A small dark teal with blue-grey bill and legs, brown-streaked plumage, and fine pale spotting on the flanks. The most widespread teal in sub-Saharan Africa. Found on freshwater lakes and marshes. Highly nomadic; follows seasonal rainfall. Swims low in the water like a pochard.