Brent Goose vs White-backed Duck
Branta bernicla เปรียบเทียบกับ Thalassornis leuconotus
Side-by-Side Comparison
| คุณสมบัติ | Brent Goose | White-backed Duck |
|---|---|---|
| ชื่อวิทยาศาสตร์ | Branta bernicla | Thalassornis leuconotus |
| อันดับ | Anseriformes | Anseriformes |
| วงศ์ตระกูล | Anatidae | Anatidae |
| สถานะการอนุรักษ์ | Least Concern | Least Concern |
| ความยาว | — | — |
| กว้างปีก | 63.9 cm (25.2 in) | 33.3 cm (13.1 in) |
| น้ำหนัก | 1335.0 g (47.09 oz) | 704.6666666666666 g (24.86 oz) |
| อาหาร | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … | -- |
| จำนวนไข่ | 1-10 | 4-10 |
| Population Trend | — | — |
Habitat Comparison
ถิ่นที่อยู่อาศัยร่วมกัน
Brent Goose only
White-backed Duck only
ไม่มี
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.
White-backed Duck
Freshwater lakes, ponds, and swamps with abundant floating aquatic vegetation, especially water lilies, in sub-Saharan Africa and Madagascar. Prefers shallow sheltered water with emergent vegetation for cover.
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.
White-backed Duck
Soft, low whistles and hissing sounds. The White-backed Duck is relatively quiet compared to whistling-ducks. Alarm call is a low 'peep'. Mostly heard at night.
Geographic Range & Migration
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
White-backed Duck
สถานะการอนุรักษ์
Brent Goose
White-backed Duck
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.
White-backed Duck
Heavily mottled and barred brown and buff overall. Diagnostic white back patch visible in flight. Head brown with whitish face and chin. Stiff tail held erect. Sexes similar; stiff-tail diving …
About These Birds
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.
White-backed Duck
A small compact brown-barred diving duck with a distinctive white back visible in flight and a large dark-blotched bill. Shy and easily overlooked among floating aquatic vegetation. An expert diver, feeding on water-lily seeds and tubers in African freshwater wetlands.