Out of hand

It seems as though my rat problems are getting worse! I picked up the phone in the classroom and answered and thought "That was funny, they hung up".....only to look down and notice that my cord had been chewed by "a certain something". Nice. This is getting out of hand and it looks like I will be having to set out some traps....but people these are no ordinary rats, they are the big ole lake rats that are more like small cats. I am not looking foward to walking in in the morning to see if it has been stuck on the paper. This sucks!