Brown Rat vs Formosan koa

Rattus norvegicus compared with Acacia confusa

Taxonomic Classification

Rank	Brown Rat	Formosan koa
Kingdom	Animalia (Animals)	Plantae (Plants)
Phylum	Chordata (Chordates)	Magnoliophyta (Flowering Plants)
Class	Mammalia (Mammals)	Magnoliopsida (Dicots)
Order	Rodentia (Rodents)	Fabales (Legumes & Allies)
Family	Muridae (Mice & Rats)	Fabaceae
Genus	Rattus	Acacia
Species	Rattus norvegicus	Acacia confusa

Conservation Status

Brown Rat

LC — Least Concern

Formosan koa

LC — Least Concern

Physical Characteristics

Attribute	Brown Rat	Formosan koa
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).

Formosan koa

Habitat

Inhabits tropical and subtropical moist broadleaf forests spanning the Indomalayan and Oceanian realms. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Africa (Mauritius, Seychelles), Asia (5 countries), North America (United States), and Oceania and the Pacific (Fiji, Micronesia, Palau).

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 8 countries:

🇫🇯 Fiji 🇯🇵 Japan 🇲🇺 Mauritius 🇫🇲 Micronesia 🇵🇼 Palau 🇸🇨 Seychelles 🇹🇼 Taiwan 🇺🇸 United States