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I train my pet rats using clicker training and positive reinforcement. Their favorite treats are cheerios, but they also enjoy working for dog treats, peas, and dinner left overs. My rats are from various sources, if you are interested in getting pet rats, check local spca's and rats rescues.
I've always kind of felt sorry for rats. They actually play a huge part in nature and things would be quite messy without their cleaning crews. They get a bum rap. But no one wants a giant one roaming their house!
Please excuse my sharing if you are disgusted by the sight of them.