Thank you for your welcome, probably will spending a lot of time on this forum in next few months!
For now, all I need is some web sites about Thamnophis in general that I can print out. Already heard about the book - Ecology of Garter snake (40$) and I am planing 2 buy it when arrive in States.
Have 6 more days in Croatia so wanna be prepared (with at least general informations about that genus) and ready 2 start the project as soon as can.
I'll be working under Dr Marc Hayes supervision at Burke Museum in Seattle.