Polar bear vs Water yam

Ursus maritimus compared with Dioscorea alata

Key Differences

• Polar bear is Vulnerable while Water yam is Not Evaluated.

Taxonomic Classification

Rank	Polar bear	Water yam
Kingdom	Animalia (動物)	Plantae (植物)
Phylum	Chordata (脊索動物)	Magnoliophyta (被子植物門)
Class	Mammalia (哺乳類)	Liliopsida (単子葉植物綱)
Order	Carnivora (ネコ目)	Dioscoreales (ヤマノイモ目)
Family	Ursidae (Bears)	Dioscoreaceae
Genus	Ursus (Bears)	Dioscorea
Species	Ursus maritimus	Dioscorea alata

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Water yam

NE — Not Evaluated

Physical Characteristics

Attribute	Polar bear	Water yam
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Water yam

Habitat

Typically found in grasslands, wetlands, forests, and cultivated landscapes.

Range

Widely distributed across Africa (16 countries), Asia (Maldives, Taiwan), Europe (United Kingdom), North America (13 countries), Oceania and the Pacific (4 countries), and South America (6 countries).

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。