Polar bear vs Tweedy's crab eating rat

Ursus maritimus compared with Ichthyomys tweedii

Key Differences

Polar bear is Vulnerable while Tweedy's crab eating rat is Data Deficient.

Taxonomic Classification

Rank	Polar bear	Tweedy's crab eating rat
Kingdom same	Animalia (động vật)	Animalia (động vật)
Phylum same	Chordata (động vật có dây sống)	Chordata (động vật có dây sống)
Class same	Mammalia (lớp Thú)	Mammalia (lớp Thú)
Order	Carnivora (bộ Ăn thịt)	Rodentia (Bộ Gặm nhấm)
Family	Ursidae (Bears)	Cricetidae
Genus	Ursus (Bears)	Ichthyomys
Species	Ursus maritimus	Ichthyomys tweedii

Evolutionary Relationship

Polar bear and Tweedy's crab eating rat share a common ancestor at the Class level: Mammalia. (lớp Thú)

Xem Class: Mammalia

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Tweedy's crab eating rat

DD — Data Deficient

Physical Characteristics

Attribute	Polar bear	Tweedy's crab eating rat
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.

Tweedy's crab eating rat

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Ecuador.

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.