Pests We Treat - Large dead rat in Hightstown, NJ.
There are many potential access points that rodents will find to enter a structure. And they are not all at ground level. Rats, for example, can burrow underground and they are also excellent climbers. If that weren't enough, rats are amazingly good swimmers and can enter homes by swimming up sewer pipes and climbing out of toilets. Mice have no real issues getting inside, due to their small size, they can enter through a hole the size of a dime. Rats, on the other hand, require a hole about the size of a quarter. However, these creatures are very intelligent and if they can't find an access point, they usually have no problems enlarging a hole using their razor-sharp incisor teeth. While inspecting the building's exterior, I found such an an access point behind some pipes that would easily allow rats to come and go as they pleased into the structure.