Found one of my female Russians dead this evening. She hibernated for 15 weeks. Lost very little weight. Has been up for 3 weeks. No visible illness or injury. She has been active since getting up, and has been gaining weight. She had white discharge around her mouth. Not a lot, just a little. Her neck was extended like she was maybe having difficulty breathing, but her nostrils are open and clear. I do not understand. I have never lost a Russian before. She was a rescue that I have had for about 3 years.