Why do house mice reproduce so successfully around humans?

The house mouse (Mus musculus) thrives alongside humans due to its highly adaptive nature and specific biological advantages. Their success is primarily driven by a rapid rate of reproduction, which allows them to capitalize on the resources provided by human environments.1

Key factors contributing to their reproductive success include:

• Year-round Breeding: Unlike outdoor populations that may be limited by seasonal changes, house mice living indoors breed throughout the year.1
• High Fecundity: These rodents are prolific breeders, capable of producing up to 14 litters per year, with a typical litter size of 5 to 6 young.1
• Short Gestation: The gestation period is remarkably brief, lasting only 19 to 21 days.1
• Behavioral Adaptability: House mice are omnivorous and agile, allowing them to construct nests in protected indoor spaces and exploit human food sources, which sustains their high reproductive output.1

By associating with humans, these rodents have successfully expanded their range worldwide, utilizing buildings as stable habitats that facilitate their survival and proliferation.1