Reunion Shelduck vs Brent Goose
Alopochen kervazoi 比較対象 Branta bernicla
Side-by-Side Comparison
| 属性 | Reunion Shelduck | Brent Goose |
|---|---|---|
| 学名 | Alopochen kervazoi | Branta bernicla |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Extinct | Least Concern |
| 体長 | — | — |
| 翼開長 | — | 63.9 cm (25.2 in) |
| 体重 | — | 1335.0 g (47.09 oz) |
| 食性 | Extinct Reunion shelduck; likely fed on grasses, seeds, and aquatic invertebrates near coastal wetlands based … | Primarily herbivorous; grazes aquatic plants, grasses, and sedges; swans upend in shallow water for submerged … |
| 一腹卵数 | -- | 1-10 |
| Population Trend | — | — |
Habitat Comparison
Reunion Shelduck
Historically restricted to Réunion Island in the Mascarene archipelago. Now extinct; last evidence from early colonial period. Presumably inhabited freshwater wetland habitats on the island.
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
Reunion Shelduck
Extinct (EX); no vocalizations recorded. The Reunion Shelduck was exterminated soon after European contact. No contemporary accounts of its call survive in the historical record.
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
Reunion Shelduck
Formerly found across the Pacific from Hawaii to New Zealand. Extinct by the 19th century; survived late on uninhabited islands.
Brent Goose
Breeds across boreal and subarctic Canada and Alaska; winters in the southern United States, Mexico, and Central America.
保全状況
Reunion Shelduck
Brent Goose
How to Tell Them Apart
Reunion Shelduck
Extinct Mascarene species known only from subfossil bones found on Réunion. Plumage unrecorded; presumed similar to Egyptian Goose with brownish-gray tones. Extirpated following European colonization.
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
Reunion Shelduck
An extinct shelduck formerly endemic to Réunion Island in the Indian Ocean. Known only from subfossil bones and brief historical records from the 17th century. Went extinct shortly after European colonization. No illustrations or detailed physical description of the living bird is known.
Brent Goose
北極圏で繁殖し、北半球の海岸で越冬する小型のガン（体長55〜66cm）。黒い頭・首・胸に短い白い首輪が特徴。Branta bernicla（コクガン）は主にアマモなどの海草を食べ、干潟や浅い入り江を好む。日本でも北海道・東北の海岸で越冬する姿が見られ、個体数は比較的少ない。Anatidae科。