I think we might not give snakes enough credit for personality. IMO, if you feed them live all the time, they turn into culinary snobs. And they probably also associate sound/motion with food, so they never learn that something that is still and doesn't squeak is just as edible. I think when they're young, you can fool them into realizing that the only relevant sign of food is the warmth. My corn won't eat F/T mice unless they're pretty warm. He ignores ones at room temperature, probably because the first ones he got were live, and pretty toasty because of it. It took me a couple feedings to get him to reliably eat F/T pinkies. And now he's got me trained to warm them up under his lamp before offering them to him. Not quite sure who's running the show in this relationship.