Rodents are world wide spread animal group which is closer with human beings and play an important role in ecosystems function. Biologically as well as economically they are important animal group. As a pest and a vector it is important to aware their behavior and life style. During this study, their food habit, nich and their favorable environmental factors are studied. In the context of Sri Lanka, the Rodents population is very high and there are only very few researchers working on them. Finally, this study revealed that the specific behavioral characteristics of Myomorps (rats, mice and bandicoots) in law country forest in Sri Lanka.