I try to wiggle the rat to get a strike/constrict out of them. Don't know if it matters, but it gives them a little bit exersize. If I lay it in there, they just go swallow it. Of course we have one Guyana that will only take a F/T rat off a plate!!! No feed tote, wont eat. No jiggle, won't eat. On substrate, won't eat (good), on a plate, she will mosey over and snarf itdown. What a snob!!