Brent Goose vs Green Pygmy-goose
Branta bernicla comparado com Nettapus pulchellus
Side-by-Side Comparison
| Atributo | Brent Goose | Green Pygmy-goose |
|---|---|---|
| Nome científico | Branta bernicla | Nettapus pulchellus |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Least Concern | Least Concern |
| Comprimento | — | — |
| Envergadura | 63,9 cm (25.2 in) | 33,8 cm (13.3 in) |
| Peso | 1335,0 g (47.09 oz) | 328,75 g (11.60 oz) |
| Dieta | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | Eats seeds, aquatic plants, and invertebrates; dabbles in shallow fresh water; diet varies between seasons … |
| Tamanho da postura | 1-10 | 8-12 |
| Population Trend | — | — |
Habitat Comparison
Habitats partilhados
Brent Goose only
Green Pygmy-goose only
Nenhum
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.
Green Pygmy-goose
Lily-covered tropical freshwater billabongs, lagoons, and seasonal floodplains in New Guinea and the tropical Top End of the Northern Territory and Queensland, Australia. Highly dependent on aquatic vegetation.
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.
Green Pygmy-goose
Male gives a high-pitched, melodic two-note whistle; female produces a quiet, nasal grunt. Courtship includes rapid chattering exchanges between paired birds on tropical lagoons.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Green Pygmy-goose
Breeds across northern and central Eurasia; winters in tropical Africa and South Asia.
Estado de conservação
Brent Goose
Green Pygmy-goose
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.
Green Pygmy-goose
Males have dark green head and neck with white cheek patch; dark back; white underparts; flanks gray-green with fine barring. Females duller with brown cap and white face. White wing …
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.
Green Pygmy-goose
O pato-pigmeu-verde-anão é um pequeno pato encontrado na Nova Guiné, ilhas adjacentes e norte da Austrália. Os machos têm dorso verde-escuro iridescente marcante com colar branco e ventre branco. Habita zonas húmidas tropicais, especialmente lagoas e lagos com vegetação aquática flutuante abundante como lírios de água. É o menor pato da Austrália. Nidifica em ocos de árvore. Tem uma distribuição mais restrita do que o pato-pigmeu-do-algodão relacionado.