Baer's Pochard vs Brent Goose
Aythya baeri เปรียบเทียบกับ Branta bernicla
Side-by-Side Comparison
| คุณสมบัติ | Baer's Pochard | Brent Goose |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Aythya baeri | Branta bernicla |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Critically Endangered | Least Concern |
| ความยาว | — | — |
| กว้างปีก | 40.4 cm (15.9 in) | 63.9 cm (25.2 in) |
| น้ำหนัก | 707.25 g (24.95 oz) | 1335.0 g (47.09 oz) |
| อาหาร | 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 … |
| จำนวนไข่ | 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.
สถานะการอนุรักษ์
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
A medium-sized diving duck. Males have a glossy green-black head, chestnut breast, and white flanks; females are brown. Critically Endangered; one of the fastest declining ducks in Asia. Breeds in eastern Siberia; winters in eastern China and Southeast Asia. Threatened by hunting.
Brent Goose
A small dark-bodied goose with a black head and neck, small white neck patches, and pale grey belly. Migrates between high-Arctic breeding grounds and temperate coastal wintering areas. Feeds on eel-grass and saltmarsh vegetation in winter. Three subspecies differ in belly coloration.