I've been feeding the larvae pretty regularly. Bought a tub of 250 earlier this month, and was surprised yesterday to see a few flies starting to emerge within the cup they came in. Norman definitely approves of the flies as well. He doesn't like the worms once they turn dark so I'm just leaving those in the dish to pupate and feeding the remaining white larvae as part of his daily diet. I love that you don't have to refrigerate them, nor dust them.