I was feeding pre killed / frozen thawed for quite some time and I had several ball pythons that were on a 'fast'. I switched over to live and they all started eating. I don't think it's because they 'suddenly switched', I believe that live rodents are a more natural and readily accepted food source compared to a dead rodent. I don't believe that ball pythons are scavengers (eating other dead animals), they are predators born and bred to hunt and kill rodents. I think that's hard for people to comprehend since it's completely opposing our human nature. Best thing to do with extra rodents is to bring them back to the breeder / pet store or give them away to other local snake keepers. Or get another snake other than a ball python that will always eat your left overs.