I have been reading on here that rats are better then mice as far as having more to them . I have found someone that can supply me with rats . he also had some mice left over and he gave me those as well . I have been giving him the mice first because that is what he was used to and I have also read how hard it is to get them to switch from mice to rats . So today I was just wanting to see if he would go for it and eat a rat sines I have 4 bags of them . I gave it to him and then my 2 yr old woke up so I did not get to watch him eat it ( it was f/t so i did not need to watch ) I was worried about him not getting the head down even though the body is same size as the small mice he was on the head is way bigger . So i came back and it was gone and there was a sizable lump ! So ok he will eat rats . Now i feel sure he will eat both but is it bad for them to switch back and forth ? I still have this bag of mice to go through. I am not worried about him not being able to switch back in forth just want to know if it will make him sick or whatever .