Brent Goose vs Radjah Shelduck
Branta bernicla comparado com Radjah radjah
Side-by-Side Comparison
| Atributo | Brent Goose | Radjah Shelduck |
|---|---|---|
| Nome científico | Branta bernicla | Radjah radjah |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | — | — |
| Envergadura | 63,9 cm (25.2 in) | 54,0 cm (21.3 in) |
| Peso | 1335,0 g (47.09 oz) | 883,5 g (31.16 oz) |
| Dieta | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | -- |
| Tamanho da postura | 1-10 | 6-15 |
| Population Trend | — | — |
Habitat Comparison
Brent Goose
Breeds on high-Arctic tundra; winters on estuaries, coastal mudflats, saltmarshes, and sea-grass beds along Atlantic and Pacific coastlines. One of the most strictly coastal wintering geese.
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.
Song & Call Comparison
Brent Goose
A low, guttural 'rronk' or 'ronk-ronk' from flocks. Soft nasal calls in feeding groups. A subtle, understated call for a goose — less loud than most Anser geese.
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.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Radjah Shelduck
Estado de conservação
Brent Goose
Radjah Shelduck
How to Tell Them Apart
Brent Goose
Small; mostly black head, neck, and breast. Small white neck-patch on adults. Back dark brownish-gray; belly pale gray to white depending on subspecies. White undertail coverts. Sexes similar.
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.
About These Birds
Brent Goose
O ganso-ruivo é um pequeno ganso marinho que cria na tundra ártica e hiberna em costas marinhas temperadas. Tem cabeça e pescoço pretos com remendo branco manchado no pescoço. As subespécies variam nas cores do ventre de pálido a escuro. Alimenta-se de ervas marinhas, alfaces-do-mar e outras plantas costeiras. As populações colapsaram nos anos 1930 devido ao declínio das ervas marinhas, mas recuperaram com o retorno destas. Estão entre os gansos que percorrem as maiores distâncias de migração.
Radjah Shelduck
A medium-sized elegant shelduck with white body plumage, chestnut breast band, dark green back, and pinkish-red bill and legs. Found in coastal mangroves, mudflats, and tropical wetlands of New Guinea and northern Australia. Calls with a loud raspy rattling sound.