Is N. n. helvetica the subspecies from England? I know that there were a few grass snake specimens (I think all male) available a few years ago from Ohio, but I don't know what subspecies.
I'm also interested in grass snakes, unfortunately, I think they're protected in their natural ranges (EU environmental laws) so if they aren't already kept as a viable captive breeding population in the US, I don't know if we can legally get more. (Correct me if I'm wrong on this - 'cause I hope I am wrong!)
I'd be real interested to see if people are working with these!
-----
Lisa
Living Earth Environmental Education
@__/ __/ __ / __==< :>--