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Presentation
The domestic rat is a selected variant of the brown rat (Rattus norvegicus) that has been domesticated since the 19th century. Initially bred for rat fights and shows, it became a popular pet and a major subject of scientific research. Docile and sociable, it differs from its wild counterpart through smaller size and varied coat colors.
The domestic rat has a sleek body, a long scaly tail, and small rounded ears. Its coat is highly variable and can be gray, white, black, beige, or multicolored depending on the breed. Its eyes may be black, red, or pink depending on genetic mutations. Its pointed snout and sensitive whiskers enable excellent exploration.
Characteristics
Indicative values: they vary by subspecies, sex and region.
Habitat and distribution
The domestic rat is entirely dependent on humans and is found only in urban and domestic environments. In captivity, it typically lives in specially designed cages or enclosures with bedding, hiding spots, and enrichment. In the wild, its ancestors inhabit urban and agricultural areas.
CURRENT RANGE
The domestic rat exists in the wild only in urban and periurban areas near human settlements. It is not naturally found in Tunisia in the wild. Most domestic rat populations are maintained by humans in captivity worldwide as pets or for scientific research.
Behaviour
The domestic rat is intelligent, curious, and highly social. It thrives best in groups and enjoys interacting with other rats and humans. It is active mainly at night (nocturnal) and loves to explore and play. These rodents recognize their owner and can learn simple tricks.
Reproduction
The domestic rat reaches sexual maturity around 8 to 12 weeks of age. Females have a short reproductive cycle of approximately 4 to 5 days. Gestation lasts about 21 to 23 days, and a female can produce 5 to 10 litters per year, each containing 6 to 12 young.
Peculiarities
The domestic rat possesses great learning capacity and adapts quickly to new environments. It has been used for over a century in biomedical research, particularly in neurology and pharmacology. Its immune system similar to humans makes it a preferred animal model for scientific studies.
Threats and conservation
The domestic rat in captivity does not face natural threats. However, laboratory populations depend entirely on the care conditions provided by humans. Escaped domestic rats can occasionally form wild colonies, but without human intervention, they typically do not survive long.
Numbers and trends vary across sources and regions. See the IUCN assessment for the latest reference data.
Gallery
1 documented photographs.
References
Profile updated 08 August 2026 · Reviewed by the TunisieVet editorial team.
CONSERVATION STATUS
Not evaluated (NE)
IUCN source, latest published assessment.
Similar animals
Other species documented in Animalpedia.