Tundra Swan vs African Pygmy-goose
Cygnus columbianus 比較対象 Nettapus auritus
Side-by-Side Comparison
| 属性 | Tundra Swan | African Pygmy-goose |
|---|---|---|
| 学名 | Cygnus columbianus | Nettapus auritus |
| 目 | Anseriformes | Anseriformes |
| 科 | Anatidae | Anatidae |
| 保全状況 | Least Concern | Least Concern |
| 体長 | — | — |
| 翼開長 | 107.6 cm (42.4 in) | 29.9 cm (11.8 in) |
| 体重 | 6675.0 g (235.45 oz) | 272.5 g (9.61 oz) |
| 食性 | Eats seeds, aquatic plants, and invertebrates; filter-feeds in shallow water; diet becomes more invertebrate-heavy in … | Filter-feeds on invertebrates and seeds; dabbles in shallow ponds; diet more plant-based outside spring breeding … |
| 一腹卵数 | 3-6 | 6-12 |
| Population Trend | — | — |
Habitat Comparison
Tundra Swan
Breeds on Arctic tundra ponds and lakes in Alaska, Canada, and Siberia. Winters on coastal estuaries, shallow bays, agricultural fields, and freshwater lakes in North America, Europe, and eastern Asia.
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
Tundra Swan
A high, bugling 'who-who-who' with a musical quality. North American subspecies (Whistling Swan) produces a higher-pitched call than European Bewick's Swan (Cygnus c. bewickii).
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
Tundra Swan
Breeds in the northern Great Plains; winters along the Gulf Coast from Texas to Florida. Uses the Central and Mississippi flyways.
African Pygmy-goose
Breeds across temperate to sub-Arctic Eurasia; winters in Africa, South Asia, and Southeast Asia.
保全状況
Tundra Swan
African Pygmy-goose
How to Tell Them Apart
Tundra Swan
All-white plumage; bill black with small yellow patch at base near eye. Neck shorter and rounder-headed than Trumpeter Swan. Juveniles grayish-brown. Bewick's race has more extensive yellow on bill.
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
Tundra Swan
北極圏で繁殖し、北半球の温帯沿岸・湖沼で越冬するハクチョウ（体長115〜150cm）。純白の羽毛と黄と黒の嘴が特徴で、コハクチョウとも呼ばれる。Cygnus columbianus（コハクチョウ）は日本の越冬地として琵琶湖や北日本の湖沼が重要で、毎年何千羽もが越冬する壮観な光景が見られる。Anatidae科。
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。