It lives in all types of habitats except water bodies without any vegetation or floating material. It is at home in the cities as well as in the villages or the crop fields.The Brown Rat, also called Tree Rat is the most arboreal among the rats found in the countryside and forests. It usually lives in pairs or in a family group in a burrow or tree-nest and group being dominated a male that often defends its virtually borderless territory against an intruding male. It is a true omnivore (Sarker et al. 2013). This species has an acute sense of hearing and sensitive to ultrasound. It is a good swimmer, both on the surface and underwater. During excessive flood it climbs to trees and leads its normal life there up to the time the water recedes (Khan 1985, 1987, Nowak and Paradiso 1983, Parker 1990). This spcies also produces communicative noises audidle to humans.