I don't feed anything larger than a small rat. My rat eaters get smalls from the time they are about 700g to over 2,000g. Occationally if a big girl has been looking hungry for a few days she'll get 2, but still 2 smalls. Big girls can take medium rats, but most people seem to stick with smalls. I prefer to stay on the small end and offer more qty. I have 800g mousers that get 3-4 mice a week, because I keep prey items smaller than I could.