The lifecycle of a rodent will depend on the species. House mice become sexually mature in as little as five weeks and a female mouse will reproduce up to eight times during their life, with approximately four to seven pups in every litter. The average lifespan of a house mouse is one year.
Roof rats and Norway rats can become sexually mature at eight weeks, although sometimes they take up to 12 weeks. A roof rat can have four to six litters per year, on average, with four to eight pups in every litter. Norway rats will rarely have more than seven pups in one litter. The average lifespan of a roof rat is one year.