Which rat typically weighs more?

The Norway rat is typically heavier than the roof rat. Norway rats can weigh anywhere from 8 to 12 ounces, with some individuals even reaching up to a pound, making them one of the largest rat species. They are stocky with a robust body, thick fur, and a blunt snout, which contributes to their overall heavier appearance and mass.

In contrast, roof rats are generally smaller, usually weighing between 5.5 to 9 ounces. They have a slender body and a more nimble build, which is suited to their climbing and jumping abilities.

Understanding the weight difference between these two species is crucial for pest control technicians as it influences their behavior, habitat preferences, and control methods. Recognizing the Norway rat's greater weight can also help in identifying signs of infestation and determining appropriate intervention strategies.