I found a possum shivering, alone, and scared on my way to work the other day. I took him home, set him up in a warm bucket and headed back out. He's a little better now. I just put him to bed and tried to make sure he was as warm as I possibly could think of doing. I put a jacket to protect the bottom from the cold floor, I stretched a sweatshirt over top to protect from the heater air, I wrapped him up and put the heating pad on for him. I hope he's okay in the morning. He really needs to eat and drink.