The most common rat in the UK is the Norway rat (Rattus norvegicus) also known as the brown rat. It lives largely outdoors but will find its way inside if the environment allows often via drainage defects and holes in the walls. Like all rodents the Norway rat must continually gnaw to keep its incisor teeth at a manageable length, it is this gnawing that can lead to serious damage to structures. Norway rats live communally in burrow systems and are capable of very rapid reproduction where if left untreated will very quickly become a very serious pest problem.
Thoroughness is required for the successful control of rats, it requires careful planning and close understanding of the biology and habits of rats to achieve eradication.