brown bear vs Gray Birch Mouse

Ursus arctos compared with Sicista pseudonapaea

Key Differences

• brown bear is Extinct while Gray Birch Mouse is Data Deficient.

Taxonomic Classification

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

Evolutionary Relationship

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

Conservation Status

brown bear

EX — Extinct

Population: ~200.0K

Trend: Stable →

Gray Birch Mouse

DD — Data Deficient

Physical Characteristics

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

Habitat & Geographic Range

brown bear

Habitat

Typically found in a wide range of habitat types.

Range

Found across Europe (6 countries).

Gray Birch Mouse

Habitat

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.