Brown Rat vs Unicolored Thomasomys

Rattus norvegicus compared with Thomasomys monochromos

Key Differences

• Brown Rat is Least Concern while Unicolored Thomasomys is Endangered.

Taxonomic Classification

Rank	Brown Rat	Unicolored Thomasomys
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order same	Rodentia (Rodents)	Rodentia (Rodents)
Family	Muridae (Mice & Rats)	Cricetidae
Genus	Rattus	Thomasomys
Species	Rattus norvegicus	Thomasomys monochromos

Evolutionary Relationship

Brown Rat and Unicolored Thomasomys share a common ancestor at the Order level: Rodentia. (Rodents)

Conservation Status

Brown Rat

LC — Least Concern

Unicolored Thomasomys

EN — Endangered

Physical Characteristics

Attribute	Brown Rat	Unicolored Thomasomys
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brown Rat

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 10 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (11 countries), Asia (15 countries), Europe (41 countries), North America (16 countries), Oceania and the Pacific (10 countries), and South America (10 countries).

Unicolored Thomasomys

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Range

Found in Colombia. Currently classified as Endangered on the IUCN Red List, this species faces significant conservation challenges across its range.

Brown Rat

Brown Rat (Rattus norvegicus) is classified as Least Concern (LC) on the IUCN Red List. Widespread and abundant across its range, with stable populations and no immediate conservation concerns.

Shared Countries

Both species can be found in 1 countries:

🇨🇴 Colombia