Baer's Pochard vs Brent Goose
Aythya baeri comparado com Branta bernicla
Side-by-Side Comparison
| Atributo | Baer's Pochard | Brent Goose |
|---|---|---|
| Nome científico | Aythya baeri | Branta bernicla |
| Ordem | Anseriformes | Anseriformes |
| Família | Anatidae | Anatidae |
| Estado de conservação | Critically Endangered | Least Concern |
| Comprimento | — | — |
| Envergadura | 40,4 cm (15.9 in) | 63,9 cm (25.2 in) |
| Peso | 707,25 g (24.95 oz) | 1335,0 g (47.09 oz) |
| Dieta | Dives for molluscs and aquatic invertebrates; diet dominated by hard-shelled benthic prey in coastal shallow-water … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| Tamanho da postura | 6-13 | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Baer's Pochard
Breeds on lakes and rivers in boreal forests of eastern Siberia and northeastern China. Winters on freshwater lakes and wetlands in eastern and southeastern Asia. Critically Endangered; tiny remaining population.
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.
Song & Call Comparison
Baer's Pochard
Male gives a low, grating wheeze; female produces a harsh quacking series. Calls resemble Tufted Duck but slightly softer; among the rarest duck calls in East Asia due to its …
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.
Geographic Range & Migration
Baer's Pochard
Breeds in Arctic Canada and Alaska; winters at sea off both US coasts and in the Great Lakes during migration.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
Estado de conservação
Baer's Pochard
Brent Goose
How to Tell Them Apart
Baer's Pochard
Males have dark glossy greenish-black head; chestnut breast; white flanks and undertail. White eye. Females brown with chestnut breast and pale face patch. White wing stripe in flight. Critically endangered …
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.
About These Birds
Baer's Pochard
O pato de Baer é um pato mergulhador criticamente ameaçado nativo do nordeste da China e adjacente Rússia. Os machos têm cabeça e pescoço verdes com olhos brancos característicos. Cria em zonas húmidas de floresta inundada e hiberna no Sul e Sudeste da Ásia. As populações colapsaram nos últimos anos de números anteriores de milhares para apenas centenas, tornando-o um dos patos mais em perigo do mundo. As causas incluem caça, perda de habitat e perturbação.
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.