When it comes to reproduction and lifespan, roof rats are a species that reproduce relatively quickly. These cunning creatures typically reach sexual maturity in a mere 2-5 months, after which they can give birth to litters of 6-20 babies following a gestation period lasting 20-24 days.
The young rely heavily on their mothers for nourishment and care for around 17-23 days before they can go off and fend for themselves. Roof rats have an average lifespan of one year. They can breed throughout the year, with birth rates peaking in the spring and fall seasons, depending on food availability and weather conditions.