I totally agree with Malta on this one... as a matter of fact I have a cat in my lap and rat in my hoodie as I type this. Our cat is atleast 16yrs. old, so she's tamed a bit with age, but she still hunts... and suprisingly still brings in animals (her last was a nice sized rabbit this spring... fortunately for him he made it out without too much damage done). She has caught birds, possums, moles, squirrels, rabbits, and even wild mice. She was respectful of the dog we had because the dog was there first, but any other cat or dog she HATED. She is very fond of the ratties though, and she even liked our last ferret... she pays the fish we have no mind. It's funny that Malta mentioned cats thinking they are kittens. Our cat Flower grooms them like a kitten, she even lets them cuddle with her and purrs the whole time she's around them. She doesn't mind them near her food bowl when she eats either... she would have ripped our older cat Moby a new one if he tried that crap. That rats don't mind her at all... Mindy gets a little tense if the cat suprises her but other than that they are good. Lucy loves her, she'll smell her and brux... and even grooms her (that's not a suprise, this rat grooms everything). She doesn't bother them in the cage, barely even looks at them. She's a good girl, and i'm sure like Malta mentioned, that she knows I care for them just as I care for her... and that i'm fond of them. Why not? As long as they're supervised and the cat and rats act fine during introduction. Just keep them supervised... and if you have an outdoor cat make sure to inspect for fleas and mites. Just my personal opinion on the matter.