Polar bear vs Stone Crayfish

Ursus maritimus compared with Austropotamobius torrentium

Key Differences

• Polar bear is Vulnerable while Stone Crayfish is Data Deficient.

Taxonomic Classification

Rank	Polar bear	Stone Crayfish
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Chordata (脊索動物)	Arthropoda (節足動物)
Class	Mammalia (哺乳類)	Malacostraca (軟甲綱)
Order	Carnivora (ネコ目)	Decapoda (十脚目)
Family	Ursidae (Bears)	Astacidae
Genus	Ursus (Bears)	Austropotamobius
Species	Ursus maritimus	Austropotamobius torrentium

Evolutionary Relationship

Polar bear and Stone Crayfish share a common ancestor at the Kingdom level: Animalia. (動物)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Stone Crayfish

DD — Data Deficient

Physical Characteristics

Attribute	Polar bear	Stone Crayfish
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.

Stone Crayfish

Habitat

Typically found in marine, freshwater, and terrestrial environments.

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。