Brown Rat vs smooth giant clam

Rattus norvegicus compared with Tridacna derasa

Key Differences

• Brown Rat is Least Concern while smooth giant clam is Vulnerable.

Taxonomic Classification

Rank	Brown Rat	smooth giant clam
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum	Chordata (Chordates)	Mollusca (Mollusks)
Class	Mammalia (Mammals)	Bivalvia (Bivalvia)
Order	Rodentia (Rodents)	Cardiida (Cardiida)
Family	Muridae (Mice & Rats)	Cardiidae
Genus	Rattus	Tridacna
Species	Rattus norvegicus	Tridacna derasa

Evolutionary Relationship

Brown Rat and smooth giant clam share a common ancestor at the Kingdom level: Animalia. (Animals)

Conservation Status

Brown Rat

LC — Least Concern

smooth giant clam

VU — Vulnerable

Physical Characteristics

Attribute	Brown Rat	smooth giant clam
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).

smooth giant clam

Habitat

Inhabits tropical and subtropical moist broadleaf forests within the Oceanian biogeographic realm.

Range

Distributed across Marshall Islands and Taiwan. Currently classified as Vulnerable 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 2 countries:

🇲🇭 Marshall Islands 🇹🇼 Taiwan