Wild rats will bite you. The tanks would have to be completely escape proof and I don't know how you would feed them without getting bit, also you'd have to think about how you would clean the tanks. You'd have to take the lid off to clean and rats can jump three feet. I tried that with wild mice I caught like six with a live trap and they all escaped. To me not worth the rabies shots something like 20 needles in your stomach and not worth them escaping and creating a rat infestation in your home.