I don't think it is a bug. The lizards that died were not even housed in the same building plus there were some other factors involved. I do believe it was severe dehydration and it destroyed the kidneys. I am looking into necropsy. I guess it is more of being too sure of myself than bad luck. I do think that the lower baja penninsula and insular herps do require somewhat higher humidity than the mainland chucks and collareds. All the obesus and crotaphytus seemed to fare very well during hibernation. I had a discussion with Craig Ivanyi at the desert museum and got more info that was previously not given to me such as the enclosures there stay fairly humid during the winter from the botany dept watering the plants in them, etc.