Well, I have been seeing small critters scamper to under the office. The office in the barn has a concrete floor and under it used to house a ground hog family. I saw the critters run for the opening to the den (it was fairly dark in the barn) and put dirt there. The next night I found a hole big enough for the rodents to get out and feed. I have put the feeders up, left the waterer, and flooded the den. I saw a big ol' rat come out of the den so I am guessing the last groundhog we had decided to leave. We caught the rest of the ground hog family this summer. So the little rodents have had a house, food and water for who knows for how long. Here is my question at long last. Will rats harm my chickens ? I have a few that sleep on the straw in the wire mesh stalls, the silkie pile. Please tell me ALL about the little turds and how to kill them without harming my flock. I know about mice, but rats, Geezz.