That's exactly what happened with my Bee! Up to 600 g, he was a garbage disposal...f/t rats or mice...didn't care. Then he hit 600 g and decided to mix things up a bit... He's currently eating live mice (a bit of a change from his f/t small rats), but hey, at least he'll eat them. Although I've noticed that he's now starting to "take his time" about stalking them. If the conditions aren't just right, ie. he likes to stalk from the security of his hide, then he won't bother. Silly Bee...