least weasel vs Polar bear

Mustela nivalis compared with Ursus maritimus

Key Differences

least weasel is Near Threatened while Polar bear is Vulnerable.

Taxonomic Classification

Rank	least weasel	Polar bear
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class same	Mammalia (哺乳類)	Mammalia (哺乳類)
Order same	Carnivora (ネコ目)	Carnivora (ネコ目)
Family	Mustelidae (Weasels & Otters)	Ursidae (Bears)
Genus	Mustela	Ursus (Bears)
Species	Mustela nivalis	Ursus maritimus

Evolutionary Relationship

least weasel and Polar bear share a common ancestor at the Order level: Carnivora. (ネコ目)

表示 Order: Carnivora

Conservation Status

least weasel

NT — Near Threatened

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

least weasel

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests, among 4 distinct biome types spanning the Australasia and Oceanian and Palearctic realms.

Range

Widely distributed across Africa (Sao Tome and Principe), Asia (Cyprus), Europe (11 countries), and Oceania and the Pacific (New Zealand). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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.

least weasel

コイタチ（Mustela nivalis）はIUCNレッドリストで準絶滅危惧（NT）に分類されています。絶滅危惧の基準に近接しており、保護対策なしには脆弱な状態になる可能性があります。

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。