Blue Duck vs Blue-billed Teal
Hymenolaimus malacorhynchos comparado com Spatula hottentota
Side-by-Side Comparison
| Atributo | Blue Duck | Blue-billed Teal |
|---|---|---|
| Nome científico | Hymenolaimus malacorhynchos | Spatula hottentota |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Endangered | Least Concern |
| Comprimento | — | — |
| Envergadura | 45,6 cm (18.0 in) | 29,4 cm (11.6 in) |
| Peso | 861,75 g (30.40 oz) | 269,2 g (9.50 oz) |
| Dieta | Eats aquatic invertebrates, seeds, and plant material; dabbles in shallow fresh water; invertebrate diet peaks … | Feeds on seeds, aquatic plants, and invertebrates; filter-feeds in shallow water; broadly omnivorous and seasonally … |
| Tamanho da postura | 5-6 | 5-12 |
| Population Trend | — | — |
Habitat Comparison
Blue Duck
Fast-flowing clear turbulent mountain rivers and streams in pristine native forest at 300–1,500 m in both main islands of New Zealand. Requires undisturbed riparian habitat with abundant aquatic invertebrates.
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
Blue Duck
A soft, musical whistle from fast-flowing South Island rivers. Call is a clear 'whio' — giving the bird its Maori name. Also gives a soft, reedy 'squeak'. Endangered; rarely heard.
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
Blue Duck
Breeds on open prairie wetlands of the Great Plains; winters in shallow estuaries and marshes along the Gulf of Mexico.
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 conservação
Blue Duck
Blue-billed Teal
How to Tell Them Apart
Blue Duck
Distinctive slate-blue-gray plumage; breast spotted with chestnut-brown in both sexes. Pale bill with flexible pink lobes at tip. Chestnut eye. Sexes similar; adapted to fast-flowing mountain streams in New Zealand.
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
Blue Duck
O pato-azul da Nova Zelândia é um pato único e ameaçado encontrado em rios de montanha de correnteza rápida na Nova Zelândia. Tem plumagem cinzenta azulada com bico rosadinhas. Está altamente especializado para a vida em rios torrenciais de montanha. Alimenta-se de invertebrados aquáticos. As populações sofreram declínios severos devido a predadores introduzidos como furões, arminhões e ratos. Os esforços de conservação incluem programas de controlo de predadores e criação em cativeiro.
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.