A thorough house examination is important to complete step for determining appropriate mouse control methods. With this action, you’ll be able to know the type of infesting rodent (rodents, roof rat or Norway rat) and extent of invasion. The most notable sign is the existence of fecal pellets, which vary based on species. For instance; the roof rat fecal pellets tend to be larger than that of rats and Norway rat . Regarding population size, the more fecal pellets you have encountered in the house, a lot more severe is the rodent infestation.