I have tried everything from rat pups to rat weans, mouse hoppers, to adult mice. I've tried f/t and live. He has no interest, what so ever. He is not going through a shed cycle. I even attempted to assist feed (putting a feeder in his mouth but not in his throat) and he refused. Normally I'm fine with snakes going on a feeding strike (I had two females go 4 months) but they didn't lose weight all that fast. Xefaud has been a great feeder up until now.