Run along a wide miscellany of food but prefer grains. Rats usually travel an established route to the feeding site, leaving a smear or trail. They cannot hold out for more than a few days without water. Rats and mice build burrows, which may be among commodities, in rubbish piles, in roofs or in the ground. Rats are fertile all year round. The pregnancy period for rodents is 21–28 days with a life expectancy of one yr. Rats and mice have poorly developed visual sense. They detect motion by their whiskers, which are easily-developed touch organs. They possess a great sense of flavor and are adept climbers, jumpers