Rats as Pest Control?
My friend tells me that when he lived in Florida, he and his roommates kept a free-range rat as a pet and as pest control. Apparently, rats are so territorial that they keep the house free of mice, large beetles, geckos and other creepy crawlies.
Have you ever heard of or used rats in this manner? If so, how do you keep the rat friendly and "pet"able when it's essentially living on its own?