I've thawed his rats - - pinky's so far, the next meal I'll offer is a fuzzy, by putting the prey item in a reclosable zipper bag and filling a tupperware container with water. The prey items that I've offered have been fully thawed, warm, and dry every time I've tried to feed him, it was one of the first things I checked to make sure I was heating his prey right when he refused food for the first time.