I've been trying to switch all my ball pythons over to rats, but there are a couple that refuse them every time I have offered, but will eat mice. I've tried letting the rats run around in used mice shavings to get the scent but no luck with that either. Should I offer them a rat every few days until they take it or just give up and let them stay on Mice? The 2 balls that I am having trouble with are young adults that I've mostly fed African soft furreds and mice their entire lives. Any tips would be greatly appreciated. Thanks