What is the length of a Norway rat?

The length of a Norway rat typically ranges from approximately 12 3/4 inches to 18 inches, which aligns with the choice provided as the correct answer. This measurement includes the rat's body length, excluding the tail, which can be an additional 7 to 9 inches. Understanding the size of Norway rats is essential for identification and control measures in pest management, as their size can impact the type of traps and control strategies used.

The other options suggest longer lengths, which are not representative of the typical size of Norway rats. This knowledge is crucial for pest control technicians, as accurately identifying the species based on size can affect the strategies employed for effective management.