brown bear vs Niceforo Maria’s Oldfield Mouse

Ursus arctos compared with Thomasomys nicefori

Key Differences

• brown bear is Extinct while Niceforo Maria’s Oldfield Mouse is Least Concern.

Taxonomic Classification

Rank	brown bear	Niceforo Maria’s Oldfield 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)	Cricetidae
Genus	Ursus (Bears)	Thomasomys
Species	Ursus arctos	Thomasomys nicefori

Evolutionary Relationship

brown bear and Niceforo Maria’s Oldfield Mouse share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

brown bear

EX — Extinct

Population: ~200.0K

Trend: Stable →

Niceforo Maria’s Oldfield Mouse

LC — Least Concern

Physical Characteristics

Attribute	brown bear	Niceforo Maria’s Oldfield 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).

Niceforo Maria’s Oldfield Mouse

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Colombia.

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.