Intersting. Do the Argentine's ever drink or eat at all during this "hibernation" period? If so, then it's a brumation (as I suspect) and not a true hibernation such as bears. I always thought reptiles brumate and mammals hibernate, scientifically speaking. I was speaking with the late Bert last year regarding the black & whites, and I cannot remember if he said that they ate or drank during the cool down period. I do believe this got off the beaten path however of this post. Perhaps a new post regarding the hibernation or brumation aspect is next?