There should be an option for "all/some of the above" - since I feed a variety of prey to my BPs. Delilah only eats mice, Toby will eat literally anything, and Mona prefers a live rat... I also have new babies that are eating hopper mice & weanling rats. I've tried F/T and pre-killed, but they won't eat it consistently, and I find live prey easier to deal with anyway.