I have 5 healthy Russies but today had a russie dropped pretty much on the doorstep. The abondoning owner said he 'was hibernating and won't eat'. He is the shell size as my russies but he is able to pull himself very, very far back into his shell. I makes it look like his shell is way too big for him.... like he is underweight. His eyes are bright and alert and he is very active. He wouldn't eat anything i offered except some pureed pumpkin which he ate a few bites of. I was not able to find out if he had been kept at any particular temp or if he was kept under the correct uva/uvb bulbs. Ideas? Is his ability to pull so far back into his shell an indication of being 'underweight'?? I weighed one of my russies who is about 3/4 inch less carapace length than the abandoned one and there is about 1 once difference in their weight. Mine weighed 20.3 ounces and the other one weighed 19.5 oz. I was surprised he weighed that much, it just looks like there isn't very much tortoise inside of that shell. Anybody know how much weight the shell itself contributes? How can I best get weight on him and how fast? I will post some pics tomorrow to show what I mean by how far he can pull into his shell and will also try to post some pics of his shell. He has some loose scutes which I am not willing to mess with as well as a couple other concerns but no shell rot. I soaked him an hour and he did expell a large amount of urates. He does not act ill.