The Mammals of Ohio field guide lists the brown rat, long known as the Norway rat, as one of only two widespread nonnative rodents in Ohio, alongside the house mouse. It is grayish-brown with a long, scaly tail and lives wherever it can find food and shelter, from fields and garbage areas to sewers and basements. Roof rats reached Ohio early in its settlement but never became widely established, so the rats in Columbus-area homes are almost always Norway rats.
Norway rats are heavier than mice, with a blunt nose and a tail shorter than the body. They tend to live outside in burrows and come inside for food and nesting material, which is why foundations, pipe penetrations and garage doors get close attention. They also climb, so the roofline and vents are part of every inspection.
Rats breed quickly. The field guide notes litters of eight to 10 young after a pregnancy of about three weeks, and up to 12 litters a year. A few rats that get in this fall can become a much larger problem by winter.
For your home, that means we confirm the rodent, trace every connected route from the ground to the roof and pair the removal with the sealing and cleanup the space needs.