What is the average litter size of a Norway rat?

The average litter size of a Norway rat typically ranges between 6 to 12 pups, with 8 being a commonly cited average. Therefore, the answer of 8 is supported by empirical studies of Norway rat reproductive behavior. These rats are known for their prolific breeding capabilities, which is a key factor in their success as a species. High litter sizes contribute to rapid population growth, which can have significant implications for pest control and management strategies.

While smaller litter sizes may be observed in certain conditions or individual cases, the average tends to skew towards the middle of the range that encompasses 6 to 12 pups, making 8 the most appropriate and representative answer for the average litter size of a Norway rat.