To me, rats are the most annoying rodents. I've been afraid of them since I was little, and I'm annoyed by both the sound they make and their smell. Recently I even had problems with them on the ceiling of the house. We have a double ceiling, and two rats managed to penetrate between them and were agitated all day and night. They were making noise, gnawing at the pipes and installations. My father tried to get rid of them with poison but without success. Only some pest control specialists who removed the rats from the ceiling solved the problem.