I've heard that too, but it seemed like a lot of the time I heard/read about it were when snakes who were difficult feeders to begin with and were given hamsters/gerbils/ASF's to get them started and then they didn't want to switch back over. Tali's such a happy eater, I don't think I'll have an issue getting her to switch back to mice or rats, especially because she's only had two or three, and I only had five total.