Rats will eat nearly anything, but they prefer fresh grain and meat. Rats need 1/2 to one ounce of fluid each day. If rats do not get this in the food they eat, they have to find water. Unlike mice, which rarely burrow, rats will dig under buildings, along fences, and under plants and debris. The Norway rat lives mostly in burrows while the roof rat nests in walls, attics, and trees.
Per year, a female Norway rat can have six litters of up to 12 young. These 70 rats can start to breed by the time they are 3 months old. Rats breed primarily in the spring. Rats can live up to 12 to 18 months. The roof rat has smaller litters of up to eight young and can have eight litters per year.