What is the typical litter size of a Norway rat?

Norway rats, scientifically known as Rattus norvegicus, typically have a litter size that ranges from 8 to 12 pups. This larger litter size allows for a rapid growth in population, which is a key factor in their success as a species in urban and rural environments. Female Norway rats can reproduce multiple times a year, and each litter can contribute significantly to the overall population, making effective pest control measures essential. Understanding this reproductive capacity is vital for pest control operators, as it highlights the need for comprehensive management strategies to curb infestations.