Polar bear vs Smoky Oldfield Mouse

Ursus maritimus compared with Thomasomys fumeus

Key Differences

Polar bear is Vulnerable while Smoky Oldfield Mouse is Data Deficient.

Taxonomic Classification

Rank	Polar bear	Smoky Oldfield Mouse
Kingdom same	Animalia (สัตว์)	Animalia (สัตว์)
Phylum same	Chordata (สัตว์มีแกนสันหลัง)	Chordata (สัตว์มีแกนสันหลัง)
Class same	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)	Mammalia (สัตว์เลี้ยงลูกด้วยน้ำนม)
Order	Carnivora (สัตว์กินเนื้อ)	Rodentia (อันดับสัตว์ฟันแทะ)
Family	Ursidae (Bears)	Cricetidae
Genus	Ursus (Bears)	Thomasomys
Species	Ursus maritimus	Thomasomys fumeus

Evolutionary Relationship

Polar bear and Smoky Oldfield Mouse share a common ancestor at the Class level: Mammalia. (สัตว์เลี้ยงลูกด้วยน้ำนม)

ดู: Class: Mammalia

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Smoky Oldfield Mouse

DD — Data Deficient

Physical Characteristics

Attribute	Polar bear	Smoky Oldfield Mouse
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.

Smoky Oldfield Mouse

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.