Just a few more questions....

What would be the best food to offer at first? I have one small mouse now (live), do you think he'd eat it? Should I kill it first or offer it live? Or would some of the other items from the caresheet be a better option since he is freshly caught?

Also, this is by far the largest garter snake that I have ever found. He's probably around 3' now. Is this full grown for a western garter? Is there any way (other than probing) to sex it?

Thanks again for all your help and advice.