Hawaiian Goose vs Blue-billed Teal
Branta sandvicensis comparado com Spatula hottentota
Side-by-Side Comparison
| Atributo | Hawaiian Goose | Blue-billed Teal |
|---|---|---|
| Nome científico | Branta sandvicensis | Spatula hottentota |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Near Threatened | Least Concern |
| Comprimento | — | — |
| Envergadura | 72,8 cm (28.7 in) | 29,4 cm (11.6 in) |
| Peso | 2150,0 g (75.84 oz) | 269,2 g (9.50 oz) |
| Dieta | Eats aquatic plants, algae, and grasses; upends in shallow water to graze submerged vegetation; diet … | Feeds on seeds, aquatic plants, and invertebrates; filter-feeds in shallow water; broadly omnivorous and seasonally … |
| Tamanho da postura | 1-6 | 5-12 |
| Population Trend | — | — |
Habitat Comparison
Hawaiian Goose
Volcanic slopes, lava flows, coastal grasslands, and shrublands on Maui, Hawai'i, and Kauai. Adapted to rocky terrain with reduced toe webbing. Introduced to other Hawaiian islands. Avoids dense forest.
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
Hawaiian Goose
A soft, low 'moo-moo' — the murmuring call gives the Nene its Hawaiian name. Also gives honking calls in flight. Less vocal than Canada Goose; distinctive murmuring quality.
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
Hawaiian Goose
Breeds in sub-Arctic Canada; winters on large lakes and rivers from the Gulf of Mexico north to where water remains open.
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
Hawaiian Goose
Blue-billed Teal
How to Tell Them Apart
Hawaiian Goose
Buff-tan neck with black and white channeled furrows. Crown and face black; hindneck black. Body gray-brown above; underparts pale with buff breast. Reduced webbing on feet. Sexes similar. State bird …
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
Hawaiian Goose
O ganso-do-havaí, ou nēnē, é o ganso endémico do Havaí e a ave nacional do estado. Quase foi extinto no século XX, com apenas 30 aves remanescentes nos anos 1950. Graças a programas de criação em cativeiro intensivos e reintroduções, as populações cresceram para vários milhares. Ao contrário de outros gansos, está adaptado a andar em terreno vulcânico com patas parcialmente dessensoradas. Habita encostas vulcânicas e pastagens do Havaí e outras ilhas.
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.