So, I would like to try to switch my BP to rats, and I went to the pet store and picked up some frozen adult mice and some froze small rat since they had nothing smaller for rats. My BP practically inhales an adult mouse, and I am unsure if she could handle the small rat. Her widest part of her body is larger than the small rat, but the rat is 2x the length of the mouse (unsure if length makes any difference). The adult mice are 18g ea and the small rats are 40g ea.