Ardilla Gris Oriental vs Brown Rat

Sciurus carolinensis compared with Rattus norvegicus

Key Differences

• Ardilla Gris Oriental is Not Evaluated while Brown Rat is Least Concern.

Taxonomic Classification

Rank	Ardilla Gris Oriental	Brown Rat
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	Sciuridae (Squirrels)	Muridae (Mice & Rats)
Genus	Sciurus (Tree Squirrels)	Rattus
Species	Sciurus carolinensis	Rattus norvegicus

Evolutionary Relationship

Ardilla Gris Oriental and Brown Rat share a common ancestor at the Order level: Rodentia. (Rodents)

Conservation Status

Ardilla Gris Oriental

NE — Not Evaluated

Trend: Stable →

Brown Rat

LC — Least Concern

Physical Characteristics

Attribute	Ardilla Gris Oriental	Brown Rat
Diet	Omnivore	—
Average Lifespan	6 years	—
Average Length	25 cm	—
Average Weight	500 g	—

Habitat & Geographic Range

Ardilla Gris Oriental

Habitat

Typically found in a wide range of habitat types.

Range

Widely distributed across Africa (South Africa), Asia (Indonesia), Europe (10 countries), and North America (Mexico, United States).

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).

Ardilla Gris Oriental

Native to eastern North America but successfully introduced to Europe and other regions, the eastern gray squirrel is a medium-sized arboreal rodent weighing up to 600 g. Highly adaptable, thriving in forests, parks, and urban gardens, gray squirrels cache thousands of nuts and seeds each autumn, inadvertently planting trees through forgotten caches. In Britain, they have largely displaced the native red squirrel by outcompeting them for food.

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 13 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇫🇷 France 🇮🇪 Ireland 🇮🇹 Italy 🇲🇽 Mexico 🇳🇱 Netherlands 🇳🇴 Norway 🇵🇹 Portugal 🇿🇦 South Africa 🇸🇪 Sweden 🇬🇧 United Kingdom 🇺🇸 United States