My chewies do not like worms at all. They look personally offended when I offer them on tongs and ignore them in the cups. For a while, I was getting butterworms during the breeding season and cutting the heads off, but it was tedious and messy and the rewards just didn't seem worth it. I have good responses to crickets and dubia as long as the dubia aren't too big. Large nymph seems to be about right. Pictures are the results of superworms and silkworms left in the cages.