Yes, fruits would be nice to try. In addition to the ones he mentioned i'd try black berries as well. Waxworms are high in fat but i think they are fairly nutritious(high in calcium i know). Sounds crazy, but if there are june-bugs near your house, throw them in the cage. They stimulate interest with my knight. Mine won't even look at moths anymore but if a june-bug flys by in the cage he will go crazy for it. I know some of the larger ones have a hard wingcase but the smaller ones should be fine.