Altai Birch Mouse vs brown bear

Sicista napaea compared with Ursus arctos

Key Differences

• Altai Birch Mouse is Least Concern while brown bear is Extinct.

Taxonomic Classification

Rank	Altai Birch Mouse	brown bear
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Rodentia (Rodents)	Carnivora (Carnivorans)
Family	Dipodidae	Ursidae (Bears)
Genus	Sicista	Ursus (Bears)
Species	Sicista napaea	Ursus arctos

Evolutionary Relationship

Altai Birch Mouse and brown bear share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

Altai Birch Mouse

LC — Least Concern

brown bear

EX — Extinct

Population: ~200.0K

Trend: Stable →

Physical Characteristics

Attribute	Altai Birch Mouse	brown bear
Diet	—	Omnivore
Average Lifespan	—	25 years
Average Length	—	2.0 m
Average Weight	—	300.0 kg

Habitat & Geographic Range

Altai Birch Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

brown bear

Habitat

Typically found in a wide range of habitat types.

Range

Found across Europe (6 countries).

Altai Birch Mouse

The Altai Birch Mouse (Sicista napaea) is a species in the genus Sicista. It is currently classified as Least Concern on the IUCN Red List. Typically found in diverse terrestrial and aquatic ecosystems.

brown bear

The world's most widely distributed bear species, brown bears range from North America and Europe across Russia to Japan, occupying forests, tundra, and alpine meadows. Adults can weigh up to 700 kg in coastal Alaskan populations. Omnivores that consume berries, roots, fish, and carrion, brown bears are a keystone species that distribute nutrients across landscapes. Most populations are stable, though some subspecies are threatened.