Polar bear vs Siberian weasel

Ursus maritimus compared with Mustela sibirica

Key Differences

• Polar bear is Vulnerable while Siberian weasel is Least Concern.

Taxonomic Classification

Rank	Polar bear	Siberian weasel
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Carnivora (Carnivorans)	Carnivora (Carnivorans)
Family	Ursidae (Bears)	Mustelidae (Weasels & Otters)
Genus	Ursus (Bears)	Mustela
Species	Ursus maritimus	Mustela sibirica

Evolutionary Relationship

Polar bear and Siberian weasel share a common ancestor at the Order level: Carnivora. (Carnivorans)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Siberian weasel

LC — Least Concern

Physical Characteristics

Attribute	Polar bear	Siberian weasel
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.

Siberian weasel

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Distributed across Japan and Russia.

Polar bear

The largest land carnivore on Earth, polar bears can exceed 700 kg and are found across Arctic sea ice from Canada to Russia. Highly specialized marine mammals that rely on sea ice to hunt ringed and bearded seals. Excellent swimmers capable of covering vast distances in open water. Listed as Vulnerable, with populations under severe pressure from rapid Arctic sea ice loss due to climate change.