My large female garter has stopped eating just a little while ago, she is housed with her 2 children (both which just turned 1 year old on the 1st of August) and they have a very large Viv. I have a hot side which gets to 30 degrees Celsius or so (80 degrees Fahrenheit I believe) and a cold side which is closer to 20 degrees Celsius (about 70 Fahrenheit or so) but both of these tempratures vary as they are right next to a window and on hotter days, the tank gots a bit hotter, and on colder days sometimes it cools down. I don't think heat is any issue because they have lived with it like that for some time with not problems, but I thought it would be good to include. She is about 3 feet long If not more and despite not eating for like a month or so (not exactly sure) has held weight very very well and is still impressively thick. She is still active and all other snakes in the tank seem fine and healthy. Any ideas as to what could be wrong if anything?