Ross's Goose vs African Pygmy-goose
Anser rossii 比較対象 Nettapus auritus
Side-by-Side Comparison
| 属性 | Ross's Goose | African Pygmy-goose |
|---|---|---|
| 学名 | Anser rossii | Nettapus auritus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 69.2 cm (27.2 in) | 29.9 cm (11.8 in) |
| 体重 | 1513.5 g (53.39 oz) | 272.5 g (9.61 oz) |
| 食性 | Eats aquatic plants, seeds, and grasses near wetlands; omnivorous in breeding; takes invertebrates in shallow … | Filter-feeds on invertebrates and seeds; dabbles in shallow ponds; diet more plant-based outside spring breeding … |
| 一腹卵数 | 2-8 | 6-12 |
| Population Trend | — | — |
Habitat Comparison
Ross's Goose
Breeds on tundra near Hudson Bay and the central Canadian Arctic. Winters in agricultural fields, rice paddies, and wetlands in the central and southern United States, particularly California's Central Valley.
African Pygmy-goose
Freshwater lakes, ponds, and rivers with floating water lilies and other aquatic vegetation across sub-Saharan Africa from Senegal to Tanzania. Nests in tree cavities near water. Highly dependent on water lily vegetation.
Song & Call Comparison
Ross's Goose
A high, nasal yelping 'whoik' or 'hoik' — higher-pitched than Snow Goose. Flocks mix with Snow Geese; calls differ noticeably by pitch. Fast, repeated notes in flight.
African Pygmy-goose
Male produces a soft, wheezy whistle; female gives a quiet, duck-like quack. Pairs exchange rapid twittering notes during courtship on lily-covered African pools.
Geographic Range & Migration
Ross's Goose
Breeds in high Arctic tundra; winters at sea in the North Atlantic from Iceland to the British Isles and northeastern United States.
African Pygmy-goose
Breeds across temperate to sub-Arctic Eurasia; winters in Africa, South Asia, and Southeast Asia.
保全状況
Ross's Goose
African Pygmy-goose
How to Tell Them Apart
Ross's Goose
Smallest white North American goose; pure white plumage with black wingtips. Short triangular pink bill with warty pinkish-gray base. Pink-red legs. Occasional blue morph. Sexes similar.
African Pygmy-goose
Tiny. Males have glossy dark green head with orange facial patch and ear spot; chestnut-orange flanks; white underparts; black and green back. Females duller with dark eye-stripe. Small yellow-green bill.
About These Birds
Ross's Goose
ロスガンは北米北極地方に繁殖し、カリフォルニアや南部の農地で越冬する小型のガンです。白い羽毛と短い嘴が特徴的です。ハクガンと混群することが多いです。農地、湿地、草地に生息し、農作物の葉や根を採食します。
African Pygmy-goose
アフリカンピグミーグースはアフリカ南部と東部に分布する小型の木巣性カモです。雄の緑と栗色の美しい羽毛と小さなサイズが特徴的です。水草が豊富な湖や沼地に生息し、蓮や水草の種子を主食とします。木の洞に営巣します。